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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
Version 2.5
Document No.: FT_000061 Clearance No.: FTDI#77
Future Technology
Devices International Ltd
FT2232H Dual High Speed
USB to Multipurpose
UART/FIFO IC
The FT2232H is FTDI’s 5th generation of USB
devices. The FT2232H is a USB 2.0 High
Speed (480Mb/s) to UART/FIFO IC. It has the
capability of being configured in a variety of
industry standard serial or parallel interfaces.
The FT2232H has the following advanced
features:
Single chip USB to dual serial / parallel ports
with a variety of configurations.
Entire USB protocol handled on the chip. No
USB specific firmware programming required.
USB 2.0 High Speed (480Mbits/Second) and
Full Speed (12Mbits/Second) compatible.
Dual Multi-Protocol Synchronous Serial Engine
(MPSSE) to simplify synchronous serial protocol
(USB to JTAG, I2C, SPI or bit-bang) design.
Dual independent UART or FIFO or MPSSE
ports.
Independent Baud rate generators.
RS232/RS422/RS485 UART Transfer Data Rate
up to 12Mbaud. (RS232 Data Rate limited by
external level shifter).
USB to parallel FIFO transfer data rate up to 8
Mbyte/Sec.
Single channel synchronous FIFO mode for
transfers upto 40 Mbytes/Sec
CPU-style FIFO interface mode simplifies CPU
interface design.
MCU host bus emulation mode configuration
option.
Fast Opto-Isolated serial interface option.
FTDI’s royalty-free Virtual Com Port (VCP) and
Direct (D2XX) drivers eliminate the
requirement for USB driver development in
most cases.
Adjustable receive buffer timeout.
Option for transmit and receive LED drive
signals on each channel.
Enhanced bit-bang Mode interface option with
RD# and WR# strobes
FT245B-style FIFO interface option with bi-
directional data bus and simple 4 wire
handshake interface.
Highly integrated design includes +1.8V LDO
regulator for VCORE, integrated POR function
and on chip clock multiplier PLL (12MHz –
480MHz).
Asynchronous serial UART interface option with
full hardware handshaking and modem
interface signals.
Fully assisted hardware or X-On / X-Off
software handshaking.
UART Interface supports 7/8 bit data, 1/2 stop
bits, and Odd/Even/Mark/Space/No Parity.
Auto-transmit enable control for RS485 serial
applications using TXDEN pin.
Operational configuration mode and USB
Description strings configurable in external
EEPROM over the USB interface.
Configurable I/O drive strength (4, 8, 12 or
16mA) and slew rate.
Low operating and USB suspend current.
Supports bus powered, self-powered and high-
power bus powered USB configurations.
UHCI/OHCI/EHCI host controller compatible.
USB Bulk data transfer mode (512 byte packets
in High Speed mode).
+1.8V (chip core) and +3.3V I/O interfacing
(+5V Tolerant).
Extended -40°C to 85°C industrial operating
temperature range.
Compact 64-LD Lead Free LQFP or QFN
package
Available in compact Pb-free 56 Pin VQFN
packages (RoHS compliant)
+3.3V single supply operating voltage range.
ESD protection for FT2232H IO’s:
Human Body Model (HBM) ±2kV,
Machine Mode (MM) ±200V,
Charge Device Model (CDM) ±500V,
Latch-up free.
Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced in any material or
electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as-is basis and no warranty as
to their suitability for any particular purpose is either made or implied. Future Technology Devices International Ltd will not accept any claim for damages
howsoever arising as a result of use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in
any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injury. This document provides
preliminary information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the
publication of this document. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH, United
Kingdom. Scotland Registered Company Number: SC136640
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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
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Document No.: FT_000061 Clearance No.: FTDI#77
1 Typical Applications
Single chip USB to dual channel UART (RS232,
RS422 or RS485).
Single chip USB to dual channel FIFO.
Single chip USB to dual channel JTAG.
Single chip USB to dual channel SPI.
Single chip USB to dual channel I2C.
Single chip USB to dual channel Bit-Bang.
Single chip USB to dual combination of any of
above interfaces.
Single chip USB to Fast Serial Optic Interface.
Single chip USB to CPU target interface (as
memory), double and independent.
Single chip USB to Host Bus Emulation (as
CPU).
PDA to USB data transfer
USB Smart Card Readers
USB Instrumentation
USB Industrial Control
USB MP3 Player Interface
USB FLASH Card Reader / Writers
Set Top Box PC - USB interface
USB Digital Camera Interface
USB Bar Code Readers
1.1 Driver Support
The FT2232H requires USB drivers (listed below), available free from http://www.ftdichip.com, which
are used to make the FT2232H appear as a virtual COM port (VCP). This allows the user to communicate
with the USB interface via a standard PC serial emulation port (for example TTY). Another FTDI USB
driver, the D2XX driver, can also be used with application software to directly access the FT2232H
through a DLL.
Royalty free VIRTUAL COM PORT
(VCP) DRIVERS for...
Windows 10 32,64-bit
Windows 8/8.1 32,64-bit
Windows 7 32,64-bit
Windows Vista and Vista 64-bit
Windows XP and XP 64-bit
Windows 98, 98SE, ME, 2000, Server 2003, XP,
Server 2008 and server 2012 R2
Windows XP Embedded
Windows CE 4.2, 5.0 and 6.0
Mac OS 8/9, OS-X
Linux 2.4 and greater
Royalty free D2XX Direct Drivers
(USB Drivers + DLL S/W Interface)
Windows 10 32,64-bit
Windows 8/8.1 32,64-bit
Windows 7 32,64-bit
Windows Vista and Vista 64-bit
Windows XP and XP 64-bit
Windows 98, 98SE, ME, 2000, Server 2003, XP,
Server 2008 and server 2012 R2
Windows XP Embedded
Windows CE 4.2, 5.0 and 6.0
Linux 2.4 and greater
Android(J2xx)
For driver installation, please refer to the installation guides on our website:
http://www.ftdichip.com/Support/Documents/InstallGuides.htm
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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
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The following additional installation guides application notes and technical notes are also available:
AN_113, “Interfacing FT2232H Hi-Speed Devices to I2C Bus”.
AN_109 – “Programming Guide for High Speed FTCI2C DLL”
AN_110 – “Programming Guide for High Speed FTCJTAG DLL”
AN_111 – “Programming Guide for High Speed FTCSPI DLL”
AN114 – “Interfacing FT2232H Hi-Speed Devices To SPI Bus”
AN135 – MPSSE Basics
AN108 - Command Processor For MPSSE and MCU Host Bus Emulation Modes
TN_104, “Guide to Debugging Customers Failed Driver Installation”
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1.2 Part Numbers
Part Number
Package
FT2232HL-xxxx
64 Pin LQFP
FT2232HQ-xxxx
64 Pin QFN
FT2232H-56Q-xxxx
56 Pin VQFN
Note: Packaging code for xxxx is:
- Reel: Taped and Reel (LQFP =1000 pcs per reel, QFN-64 =4000 pcs per reel, QFN-56 = 3000 pcs per
reel)
- Tray: Tray packing, (LQFP =160 pcs per tray, QFN-64 =260 pcs per tray, QFN-56 = 260 pcs per tray)
Please refer to section 8 for all package mechanical parameters.
1.3 USB Compliant
The FT2232H is fully compliant with the USB 2.0 specification and has been given the USB-IF Test-ID
(TID) 40720019.
The timing of the rise/fall time of the USB signals is not only dependant on the USB signal drivers, it is
also dependant system and is affected by factors such as PCB layout, external components and any
transient protection present on the USB signals. For USB compliance these may require a slight
adjustment. This timing can be modified through a programmable setting stored in the same external
EEPROM that is used for the USB descriptors. Timing can also be changed by adding appropriate passive
components to the USB signals.
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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
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Document No.: FT_000061 Clearance No.: FTDI#77
2 FT2232H Block Diagram
Figure 2.1 FT2232H Block Diagram
For a description of each function please refer to Section 4.
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Datasheet
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Table of Contents
1 Typical Applications ............................................... 2
1.1 Driver Support ..................................................................... 2
1.2 Part Numbers ...................................................................... 4
1.3 USB Compliant ..................................................................... 4
2 FT2232H Block Diagram ........................................ 5
3 Device Pin Out and Signal Description ................... 9
3.1 64-Pin LQFP and QFN Package ............................................ 9
3.1.1 Schematic Symbol ..................................................................................... 9
3.1.2 Pin Descriptions ...................................................................................... 10
3.1.3 Common Pins .......................................................................................... 11
3.1.4 Configured Pins ....................................................................................... 13
3.1.4.1 FT2232H pins used in an RS232 interface .................................................... 13
3.1.4.2 FT2232H pins used in an FT245 Style Synchronous FIFO Interface .................. 14
3.1.4.3 FT2232H pins used in an FT245 Style Asynchronous FIFO Interface ................ 15
3.1.4.4 FT2232H pins used in a Synchronous or Asynchronous Bit-Bang Interface ....... 16
3.1.4.5 FT2232H pins used in an MPSSE ................................................................. 17
3.1.4.6 FT2232H Pins used as a Fast Serial Interface................................................ 18
3.1.4.7 FT2232H Pins Configured as a CPU-style FIFO Interface ................................. 19
3.1.4.8 FT2232H Pins Configured as a Host Bus Emulation Interface .......................... 20
3.2 56-pin VQFN Package ........................................................ 21
3.2.1 Schematic Symbol for FT4232H-56Q .......................................................... 22
3.2.2 Pin Descriptions for FT2232H-56Q ............................................................. 23
3.2.3 Common Pins for FT2232H-56Q ................................................................ 24
3.2.4 Configured Pins for FT2232H-56Q .............................................................. 26
3.2.4.1 FT2232H-56Q pins used in an RS232 interface ............................................. 26
3.2.4.2 FT2232H-56Q pins used in an FT245 Style Synchronous FIFO Interface ........... 27
3.2.4.3 FT2232H-56Q pins used in an FT245 Style Asynchronous FIFO Interface ......... 28
3.2.4.4 FT2232H-56Q pins used in a Synchronous or Asynchronous Bit-Bang Interface 29
3.2.4.5 FT2232H-56Q pins used in an MPSSE .......................................................... 30
3.2.4.6 FT2232H-56Q Pins used as a Fast Serial Interface ......................................... 31
3.2.4.7 FT2232H-56Q Pins Configured as a CPU-style FIFO Interface .......................... 32
3.2.4.8 FT2232H-56Q Pins Configured as a Host Bus Emulation Interface ................... 33
4 Function Description ............................................ 34
4.1 Key Features ..................................................................... 34
4.2 Functional Block Descriptions ............................................ 34
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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
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4.3 Dual Port FT232 UART Interface Mode Description ............ 37
4.3.1 Dual Port RS232 Configuration .................................................................. 37
4.3.2 Dual Port RS422 Configuration .................................................................. 38
4.3.3 Dual Port RS485 Configuration .................................................................. 39
4.4 FT245 Synchronous FIFO Interface Mode Description ....... 40
4.4.1 FT245 Synchronous FIFO Read Operation ................................................... 42
4.4.2 FT245 Synchronous FIFO Write Operation ................................................... 42
4.5 FT245 Asynchronous FIFO Interface Mode Description ..... 43
4.6 MPSSE Interface Mode Description. ................................... 45
4.6.1 MPSSE Adaptive Clocking ......................................................................... 46
4.7 MCU Host Bus Emulation Mode .......................................... 47
4.7.1 MCU Host Bus Emulation Mode Signal Timing – Write Cycle .......................... 48
4.7.2 MCU Host Bus Emulation Mode Signal Timing – Read Cycle ........................... 49
4.8 Fast Opto-Isolated Serial Interface Mode Description ....... 51
4.8.1 Outgoing Fast Serial Data ......................................................................... 52
4.8.2 Incoming Fast Serial Data......................................................................... 52
4.8.3 Fast Opto-Isolated Serial Data Interface Example ........................................ 53
4.9 CPU-style FIFO Interface Mode Description ....................... 54
4.10 Synchronous and Asynchronous Bit-Bang Interface Mode
Description....................................................................................... 56
4.11 RS232 UART Mode LED Interface Description .................... 59
4.12 Send Immediate / Wake Up (SIWU#) ............................... 61
4.13 FT2232H Mode Selection ................................................... 62
4.13.1 Do I need an EEPROM? ............................................................................ 63
5 Devices Characteristics and Ratings .................... 64
5.1 Absolute Maximum Ratings ............................................... 64
5.2 DC Characteristics ............................................................. 65
5.3 ESD Tolerance ................................................................... 67
5.4 Thermal Characteristics ..................................................... 68
6 FT2232H Configurations ...................................... 69
6.1 USB Bus Powered Configuration ........................................ 69
6.2 USB Self Powered Configuration ........................................ 71
6.3 Oscillator Configuration ..................................................... 73
7 EEPROM Configuration ......................................... 74
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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
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8 Package Parameters ............................................ 76
8.1 FT2232HQ, QFN-64 Package Dimensions ........................... 76
8.2 FT2232HL, LQFP-64 Package Dimensions .......................... 78
8.3 FT2232H-56Q, VQFN-56 Package Dimensions ................... 80
8.4 Solder Reflow Profile ......................................................... 81
9 Contact Information ............................................ 83
Appendix A – References ................................................... 84
Document References ...................................................................... 84
Acronyms and Abbreviations ............................................................ 84
Appendix B – List of Figures and Tables ............................. 86
List of Tables .................................................................................... 86
List of Figures .................................................................................. 87
Appendix C – Revision History ........................................... 89
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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
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3 Device Pin Out and Signal Description
3.1 64-Pin LQFP and QFN Package
The 64-pin LQFP and 64-pin QFN have the same pin numbering for specific functions. This pin numbering
is illustrated in the schematic symbol shown in Figure 3.1.
3.1.1 Schematic Symbol
GND 1
OSCI
2
OSCO
3
VPHY
4
GND 5
REF
6
DM
7
DP
8
VPLL
9
AGND 10
GND 11
VCORE
12
TEST
13
RESET#
14
GND 15
ADBUS0 16
ADBUS1 17
ADBUS2 18
ADBUS3 19
VCCIO
20
ADBUS4 21
ADBUS5 22
ADBUS6 23
ADBUS7 24
GND 25
ACBUS0 26
ACBUS1 27
ACBUS2 28
ACBUS3 29
ACBUS4 30
VCCIO
31
ACBUS5 32
ACBUS6 33
ACBUS7 34
GND 35
SUSPEND# 36
VCORE
37
BDBUS0 38
BDBUS1 39
BDBUS2 40
BDBUS3 41
VCCIO
42
BDBUS4 43
BDBUS5 44
BDBUS6 45
BDBUS7 46
GND 47
BCBUS0 48
VREGOUT
49
VREGIN
50
GND 51
BCBUS1 52
BCBUS2 53
BCBUS3 54
VCCIO
56
BCBUS4 55
BCBUS5 57
BCBUS6 58
BCBUS7 59
PWREN# 60
EECLK
62
EEDATA
61
EECS
63
VCORE
64
FT2232HL
Figure 3.1 FT2232H Schematic Symbol
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3.1.2 Pin Descriptions
This section describes the operation of the FT2232H pins for 64-pin LQFP and 64-pin QFN. Both the LQFP
and the QFN packages have the same function on each pin. The function of many pins is determined by
the configuration of the FT2232H. The following table details the function of each pin dependent on the
configuration of the interface. Each of the functions is described in the following table (Note: The
convention used throughout this document for active low signals is the signal name followed by#).
Pins marked ** default to tri-stated inputs with an internal 75KΩ (approx.) pull up resistor to VCCIO.
FT2232HL and FT2232HQ (64-pin)
Pin
Pin functions (depends on configuration)
Pin
#
Pin Name
ASYNC
Serial
(RS232)
245 FIFO
SYNC
245 FIFO
ASYNC
Bit-bang
SYNC
Bit-bang
MPSSE
Fast
Serial
interface
CPU
Style
FIFO
Host Bus
Emulatio
n
Channel A
16
ADBUS0
TXD
D0
D0
D0
D0
TCK/SK
USES
CHANNEL
B
D0
AD0
17
ADBUS1
RXD
D1
D1
D1
D1
TDI/DO
D1
AD1
18
ADBUS2
RTS#
D2
D2
D2
D2
TDO/DI
D2
AD2
19
ADBUS3
CTS#
D3
D3
D3
D3
TMS/CS
D3
AD3
21
ADBUS4
DTR#
D4
D4
D4
D4
GPIOL0
D4
AD4
22
ADBUS5
DSR#
D5
D5
D5
D5
GPIOL1
D5
AD5
23
ADBUS6
DCD#
D6
D6
D6
D6
GPIOL2
D6
AD6
24
ADBUS7
RI#
D7
D7
D7
D7
GPIOL3
D7
AD7
26
ACBUS0
TXDEN
RXF#
RXF#
**
**
GPIOH0
CS#
A8
27
ACBUS1
**
TXE#
TXE#
WRSTB#
WRSTB#
GPIOH1
A0
A9
28
ACBUS2
**
RD#
RD#
RDSTB#
RDSTB#
GPIOH2
RD#
A10
29
ACBUS3
RXLED#
WR#
WR#
**
**
GPIOH3
WR#
A11
30
ACBUS4
TXLED#
SIWUA
SIWUA
SIWUA
SIWUA
GPIOH4
SIWUA
A12
32
ACBUS5
**
CLKOUT
**
**
**
GPIOH5
**
A13
33
ACBUS6
**
OE#
**
**
**
GPIOH6
**
A14
34
ACBUS7
**
**
**
**
**
GPIOH7
**
A15
Channel B
38
BDBUS0
TXD
D0
D0
D0
TCK/SK
FSDI
D0
CS#
39
BDBUS1
RXD
D1
D1
D1
TDI/DO
FSCLK
D1
ALE
40
BDBUS2
RTS#
D2
D2
D2
TDO/DI
FSDO
D2
RD#
41
BDBUS3
CTS#
D3
D3
D3
TMS/CS
FSCTS
D3
WR#
43
BDBUS4
DTR#
D4
D4
D4
GPIOL0
D4
IORDY
44
BDBUS5
DSR#
D5
D5
D5
GPIOL1
D5
CLKOUT
45
BDBUS6
DCD#
D6
D6
D6
GPIOL2
D6
I/O0
46
BDBUS7
RI#
D7
D7
D7
GPIOL3
D7
I/O1
48
BCBUS0
TXDEN
RXF#
**
**
GPIOH0
CS#
**
52
BCBUS1
**
TXE#
WRSTB#
WRSTB#
GPIOH1
A0
**
53
BCBUS2
**
RD#
RDSTB#
RDSTB#
GPIOH2
RD#
**
54
BCBUS3
RXLED#
WR#
**
**
GPIOH3
WR#
**
55
BCBUS4
TXLED#
SIWUB
SIWUB
SIWUB
GPIOH4
SIWUB
SIWUB
**
57
BCBUS5
**
**
**
**
GPIOH5
**
**
58
BCBUS6
**
**
**
**
GPIOH6
**
**
59
BCBUS7
PWRSAV#
PWRSAV#
PWRSAV#
PWRSAV#
PWRSAV#
GPIOH7
PWRSAV#
PWRSAV#
PWRSAV#
60
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
36
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
Configuration memory interface
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63
EECS
62
EECLK
61
EEDATA
Table 3.1 FT2232H Pin Configurations for 64-pin QFN and LQFP package
3.1.3 Common Pins
The operation of the following FT2232H pins are the same regardless of the configured mode:-
Pin No.
Name
Type
Description
12,37,64
VCORE
POWER
Input
+1.8V input. Core supply voltage input.
20,31,42,56
VCCIO
POWER
Input
+3.3V input. I/O interface power supply input. Failure to connect all
VCCIO pins will result in failure of the device.
9
VPLL
POWER
Input
+3.3V input. Internal PHY PLL power supply input. It is recommended
that this supply is filtered using an LC filter.
4
VPHY
POWER
Input
+3.3V Input. Internal USB PHY power supply input. Note that this
cannot be connected directly to the USB supply. A +3.3V regulator
must be used. It is recommended that this supply is filtered using an LC
filter.
50
VREGIN
POWER
Input
+3.3V Input. Integrated 1.8V voltage regulator input.
49
VREGOUT
POWER
Output
+1.8V Output. Integrated voltage regulator output. Connect to VCORE
with 3.3uF filter capacitor.
10
AGND
POWER
Input
0V Analog ground.
1,5,11,15,
25,35,47,51
GND
POWER
Input
0V Ground input.
Table 3.2 Power and Ground for 64-pin QFN and LQFP package
Pin No.
Name
Type
Description
2
OSCI
INPUT
Oscillator input.
3
OSCO
OUTPUT
Oscillator output.
6
REF
INPUT
Current reference – connect via a 12KΩ resistor @ 1% to GND.
7
DM
I/O
USB Data Signal Minus.
8
DP
I/O
USB Data Signal Plus.
13
TEST
INPUT
IC test pin – for normal operation should be connected to GND.
14
RESET#
INPUT
Reset input (active low).
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60
PWREN#
OUTPUT
Active low power-enable output.
PWREN# = 0: Normal operation.
PWREN# =1: USB SUSPEND mode or device has not been configured.
This can be used by external circuitry to power down logic when device
is in USB suspend or has not been configured.
36
SUSPEND#
OUTPUT
Active low when USB is in suspend mode.
59
PWRSAV#
INPUT
USB Power Save input. This is an EEPROM configurable option used
when the FT2232H is used in a self-powered mode and is used to
prevent forcing current down the USB lines when the host or hub is
powered off.
PWRSAV# = 1 : Normal Operation
PWRSAV# = 0: FT2232H forced into SUSPEND mode.
PWRSAV# can be connected to GND (via a 10KΩ resistor) and another
resistor (e.g. 4K7) connected to the VBUS of the USB connector. When
this input goes high, then it indicates to the FT2232H that it is
connected to a host PC. When the host or hub is powered down then
the FT2232H is held in SUSPEND mode.
Table 3.3 Common Function pins for 64-pin QFN and LQFP package
Pin No.
Name
Type
Description
63
EECS
I/O
EEPROM – Chip Select. Tri-State during device reset.
62
EECLK
OUTPUT
Clock signal to EEPROM. Tri-State during device reset. When not in reset, this
outputs the EEPROM clock.
61
EEDATA
I/O
EEPROM – Data I/O Connect directly to Data-In of the EEPROM and to Data-Out
of the EEPROM via a 2.2K resistor. Also, pull Data-Out of the EEPROM to VCC via
a 10K resistor for correct operation. Tri-State during device reset.
Table 3.4 EEPROM Interface Group for 64-pin QFN and LQFP package
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3.1.4 Configured Pins
The following sections describe the function of the configurable pins referred to in Table 3.1 which is
determined by how the FT2232H is configured.
3.1.4.1 FT2232H pins used in an RS232 interface
The FT2232H channel A or channel B can be configured as an RS232 interface. When configured in this
mode, the pins used and the descriptions of the signals are shown in Table 3.5.
Channel A
Pin No.
Channel B
Pin No.
Name
Type
RS232 Configuration Description
16
38
TXD
OUTPUT
TXD = transmitter output
17
39
RXD
INPUT
RXD = receiver input
18
40
RTS#
OUTPUT
RTS# = Ready To send handshake output
19
41
CTS#
INPUT
CTS# = Clear To Send handshake input
21
43
DTR#
OUTPUT
DTR# = Data Transmit Ready modem signaling line
22
44
DSR#
INPUT
DSR# = Data Set Ready modem signaling line
23
45
DCD#
INPUT
DCD# = Data Carrier Detect modem signaling line
24
46
RI#
INPUT
RI# = Ring Indicator Control Input. When the Remote Wake
up option is enabled in the EEPROM, taking RI# low can be
used to resume the PC USB Host controller from suspend.
(Also see note 1, 2, 3 in section 4.12)
26
48
TXDEN
OUTPUT
TXDEN = (TTL level). For use with RS485 level converters.
29
54
RXLED#
OUTPUT
RXLED = Receive signaling output when data is transferred
from FT2232H to USB Host. Pulses low when receiving data
(RXD) via USB. This should be connected to an LED.
30
55
TXLED#
OUTPUT
TXLED = Transmit signaling output when data is transferred
from USB Host to FT2232H. Pulses low when transmitting
data (TXD) via USB. This should be connected to an LED.
Table 3.5 Channel A and Channel B RS232 Configured Pin Descriptions
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3.1.4.2 FT2232H pins used in an FT245 Style Synchronous FIFO Interface
The FT2232H only channel A can be configured as a FT245 style synchronous FIFO interface. When
configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.6. To
enter this mode the external EEPROM must be set to make port A 245 mode. A software command (Set
Bit Mode option) is then sent by the application to the FTDI driver to tell the chip to enter single channel
synchronous FIFO mode. In this mode the ‘B’ channel is not available as all resources have been switched
onto channel A. In this mode, data is written or read on the rising edge of the CLKOUT.
Channel A
Pin No.
Name
Type
FT245 Configuration Description
24,23,22,21,
19,18,17,16
ADBUS[7:0]
I/O
D7 to D0 bidirectional FIFO data. This bus is normally input unless
OE# is low.
26
RXF#
OUTPUT
When high, do not read data from the FIFO. When low, there is data
available in the FIFO which can be read by driving RD# low. When in
synchronous mode, data is transferred on every clock that RXF# and
RD# are both low. Note that the OE# pin must be driven low at least
1 clock period before asserting RD# low.
27
TXE#
OUTPUT
When high, do not write data into the FIFO. When low, data can be
written into the FIFO by driving WR# low. When in synchronous
mode, data is transferred on every clock that TXE# and WR# are both
low.
28
RD#
INPUT
Enables the current FIFO data byte to be driven onto D0...D7 when
RD# goes low. The next FIFO data byte (if available) is fetched from
the receive FIFO buffer each CLKOUT cycle until RD# goes high.
29
WR#
INPUT
Enables the data byte on the D0...D7 pins to be written into the
transmit FIFO buffer when WR# is low. The next FIFO data byte is
written to the transmit FIFO buffer each CLKOUT cycle until WR# goes
high.
32
CLKOUT
OUTPUT
60 MHz Clock driven from the chip. All signals should be synchronized
to this clock.
33
OE#
INPUT
Output enable when low to drive data onto D0-7. This should be
driven low at least 1 clock period before driving RD# low to allow for
data buffer turn-around.
30
SIWU
INPUT
The Send Immediate / WakeUp signal combines two functions on a
single pin. If USB is in suspend mode (PWREN# = 1) and remote
wakeup is enabled in the EEPROM, strobing this pin low will cause the
device to request a resume on the USB Bus. Normally, this can be
used to wake up the Host PC.
During normal operation (PWREN# = 0), if this pin is strobed low any
data in the device TX buffer will be sent out over USB on the next
Bulk-IN request from the drivers regardless of the pending packet
size. This can be used to optimize USB transfer speed for some
applications. Tie this pin to VCCIO if not used. (Also see note 1, 2, 3
in section 4.12)
Table 3.6 Channel A FT245 Style Synchronous FIFO Configured Pin Descriptions
For a functional description of this mode, please refer to section 4.4
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3.1.4.3 FT2232H pins used in an FT245 Style Asynchronous FIFO Interface
The FT2232H channel A or channel B can be configured as a FT245 asynchronous FIFO interface. When
configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.7. To
enter this mode the external EEPROM must be set to make port A or B or both 245 mode. In this mode,
data is written or read on the falling edge of the RD# or WR# signals.
Channel A
Pin No.
Channel B
Pin No.
Name
Type
FT245 Configuration Description
24,23,22,21,
19,18,17,16
46,45,44,43,
41,40,39,38
Channel A =
ADBUS[7:0]
Channel B =
BDBUS[7:0]
I/O
D7 to D0 bidirectional FIFO data. This bus is normally input
unless RD# is low.
26
48
RXF#
OUTPUT
When high, do not read data from the FIFO. When low,
there is data available in the FIFO which can be read by
driving RD# low. When RD# goes high again RXF# will
always go high and only become low again if there is
another byte to read. During reset this signal pin is tri-
state, but pulled up to VCCIO via an internal 200kΩ
resistor.
27
52
TXE#
OUTPUT
When high, do not write data into the FIFO. When low, data
can be written into the FIFO by strobing WR# high, then
low. During reset this signal pin is tri-state, but pulled up to
VCCIO via an internal 200kΩ resistor.
28
53
RD#
INPUT
Enables the current FIFO data byte to be driven onto
D0...D7 when RD# goes low. Fetches the next FIFO data
byte (if available) from the receive FIFO buffer when RD#
goes high.
29
54
WR#
INPUT
Writes the data byte on the D0...D7 pins into the transmit
FIFO buffer when WR# goes from high to low.
30
55
SIWU
INPUT
The Send Immediate / WakeUp signal combines two
functions on a single pin. If USB is in suspend mode
(PWREN# = 1) and remote wakeup is enabled in the
EEPROM, strobing this pin low will cause the device to
request a resume on the USB Bus. Normally, this can be
used to wake up the Host PC.
During normal operation (PWREN# = 0), if this pin is
strobed low any data in the device TX buffer will be sent out
over USB on the next Bulk-IN request from the drivers
regardless of the pending packet size. This can be used to
optimize USB transfer speed for some applications. Tie this
pin to VCCIO if not used. (Also see note 1, 2, 3 in section
4.12)
Table 3.7 Channel A and Channel B FT245 Style Asynchronous FIFO Configured Pin
Descriptions
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3.1.4.4 FT2232H pins used in a Synchronous or Asynchronous Bit-Bang Interface
The FT2232H channel A or channel B can be configured as a synchronous or asynchronous bit-bang
interface. Bit-bang mode is a special FTDI FT2232H device mode that changes the 8 IO lines on either (or
both) channels into an 8 bit bi-directional data bus. There are two types of bit-bang modes: synchronous
and asynchronous.
When configured in any bit-bang mode, the pins used and the descriptions of the signals are shown in
Table 3.8
Channel A
Pin No.
Channel B
Pin No.
Name
Type
Configuration Description
24,23,22,21
,
19,18,17,16
46,45,44,43,
41,40,39,38
Channel A =
ADBUS[7:0]
Channel B =
BDBUS[7:0]
I/O
D7 to D0 bidirectional Bit-Bang parallel I/O
data pins
27
52
WRSTB#
OUTPUT
Write strobe, active low output indicates
when new data has been written to the I/O
pins from the Host PC (via the USB
interface).
28
53
RDSTB#
OUTPUT
Read strobe, this output rising edge
indicates when data has been read from the
parallel I/O pins and sent to the Host PC
(via the USB interface).
30
55
SIWU
INPUT
The Send Immediate / WakeUp signal
combines two functions on a single pin. If
USB is in suspend mode (PWREN# = 1) and
remote wakeup is enabled in the EEPROM,
strobing this pin low will cause the device to
request a resume on the USB Bus.
Normally, this can be used to wake up the
Host PC.
During normal operation (PWREN# = 0), if
this pin is strobed low any data in the device
TX buffer will be sent out over USB on the
next Bulk-IN request from the drivers
regardless of the pending packet size. This
can be used to optimize USB transfer speed
for some applications. Tie this pin to VCCIO
if not used. (Also see note 1, 2, 3 in section
4.12)
Table 3.8 Channel A and Channel B Synchronous or Asynchronous Bit-Bang Configured Pin
Descriptions
For a functional description of this mode, please refer to section 4.10 Synchronous and Asynchronous Bit-
Bang Interface Mode Description.
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3.1.4.5 FT2232H pins used in an MPSSE
The FT2232H channel A and channel B, each have a Multi-Protocol Synchronous Serial Engine (MPSSE).
Each MPSSE can be independently configured to a number of industry standard serial interface protocols
such as JTAG, I2C or SPI, or it can be used to implement a proprietary bus protocol. For example, it is
possible to use one of the FT2232H’s channels to connect to an SRAM configurable FPGA such as supplied
by Altera or Xilinx. The FPGA device would normally be un-configured (i.e. have no defined function) at
power-up. Application software on the PC could use the MPSSE to download configuration data to the
FPGA over USB. This data would define the hardware function on power up. The other FT2232H channel
would be available for another function. Alternatively each MPSSE can be used to control a number of
GPIO pins. When configured in this mode, the pins used and the descriptions of the signals are shown
Table 3.9
Channel A
Pin No.
Channel B
Pin No.
Name
Type
MPSSE Configuration Description
16
38
TCK/SK
OUTPUT
Clock Signal Output. For example:
JTAG – TCK, Test interface clock
SPI – SK, Serial Clock
17
39
TDI/DO
OUTPUT
Serial Data Output. For example:
JTAG – TDI, Test Data Input
SPI – DO
18
40
TDO/DI
INPUT
Serial Data Input. For example:
JTAG – TDO, Test Data output
SPI – DI, Serial Data Input
19
41
TMS/CS
OUTPUT
Output Signal Select. For example:
JTAG – TMS, Test Mode Select
SPI – CS, Serial Chip Select
21
43
GPIOL0
I/O
General Purpose input/output
22
44
GPIOL1
I/O
General Purpose input/output
23
45
GPIOL2
I/O
General Purpose input/output
24
46
GPIOL3
I/O
General Purpose input/output
26
48
GPIOH0
I/O
General Purpose input/output
27
52
GPIOH1
I/O
General Purpose input/output
28
53
GPIOH2
I/O
General Purpose input/output
29
54
GPIOH3
I/O
General Purpose input/output
30
55
GPIOH4
I/O
General Purpose input/output
32
57
GPIOH5
I/O
General Purpose input/output
33
58
GPIOH6
I/O
General Purpose input/output
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34
59
GPIOH7
I/O
General Purpose input/output
Table 3.9 Channel A and Channel B MPSSE Configured Pin Descriptions
For a functional description of this mode, please refer to section 4.6 MPSSE Interface Mode Description.
3.1.4.6 FT2232H Pins used as a Fast Serial Interface
The FT2232H channel B can be configured for use with high-speed optical bi-directional isolated serial
data transfer: Fast Serial Interface. (Not available on channel A). A proprietary FTDI protocol designed to
allow galvanic isolated devices to communicate synchronously with the FT2232H using just 4 signal wires
(over two dual opto-isolators), and two power lines. The peripheral circuitry controls the data transfer
rate in both directions, whilst maintaining full data integrity. Maximum USB full speed data rates can be
achieved. Both ‘A’ and ‘B’ channels can communicate over the same 4 wire interface if desired.
When configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.10.
Channel B
Pin No.
Name
Type
Fast Serial Interface Configuration
Description
38
FSDI
INPUT
Fast serial data input.
39
FSCLK
INPUT
Fast serial clock input.
Clock input to FT2232H chip to clock data in
or out.
40
FSDO
OUTPUT
Fast serial data output.
41
FSCTS
OUTPUT
Fast serial Clear To Send signal output.
Driven low to indicate that the chip is ready
to send data
Table 3.10 Channel B Fast Serial Interface Configured Pin Descriptions
For a functional description of this mode, please refer to section 4.8 Fast Opto-Isolated Serial Interface
Mode Description.
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3.1.4.7 FT2232H Pins Configured as a CPU-style FIFO Interface
The FT2232H channel A or channel B can be configured in a CPU-style FIFO interface mode which allows
a CPU to interface to USB via the FT2232H. This mode is enabled in the external EEPROM.
When configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.11.
Channel A
Pin No.
Channel B
Pin No.
Name
Type
Fast Serial Interface Configuration
Description
24,23,22,21
,
19,18,17,16
46,45,44,43
,
41,40,39,38
Channel A =
ADBUS[7:0]
Channel B =
BDBUS[7:0]
I/O
D7 to D0 bidirectional data bus
26
48
CS#
INPUT
Active low chip select input
27
52
A0
INPUT
Address bit A0
28
53
RD#
INPUT
Active Low FIFO Read input
29
54
WR#
INPUT
Active Low FIFO Write input
Table 3.11 Channel A and Channel B CPU-style FIFO Interface Configured Pin Descriptions
For a functional description of this mode, please refer to section 4.9 CPU-style FIFO Interface Mode
Description.
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3.1.4.8 FT2232H Pins Configured as a Host Bus Emulation Interface
The FT2232H can be used to combine channel A and channel B to be configured as a host bus emulation
interface mode which emulates a standard 8048 or 8051 MCU host.
When configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.12
Pin No.
Name
Type
Fast Serial Interface Configuration Description
24,23,22,21,
19,18,17,16
ADBUS[7:0]
I/O
Multiplexed bidirectional Address/Data bus AD7 to AD0
34,33,32,30,
29,28,27,26
A[15:8]
OUTPUT
Extended Address A15 to A8
38
CS#
OUTPUT
Active low chip select device during Read or Write.
39
ALE
OUTPUT
Positive pulse to latch the address
40
RD#
OUTPUT
Active low read output.
41
WR#
OUTPUT
Active low write output. (Data is setup before WR# goes
low, and is held after WR# goes high)
43
IORDY
INPUT
Extends the time taken to perform a Read or Write
operation if driven low. Pull up to VCORE if not being
used.
44
CLKOUT
OUTPUT
Master clock. Outputs the clock signal being used by the
configured interface.
45
I/O0
I/O
MPSSE mode instructions to set / clear or read the high
byte of data can be used with this pin. Please refer to
Application Note AN_108 for operation of these
instructions.
46
I/O1
I/O
MPSSE mode instructions to set / clear or read the high
byte of data can be used with this pin. In addition this
pin has instructions which will make the controller wait
until it is high, or wait until it is low. This can be used to
connect to an IRQ pin of a peripheral chip. The FT2232H
will wait for the interrupt, and then read the device, and
pass the answer back to the host PC. I/O1 must be held
in input mode if this option is used. Please refer to
Application Note AN_108 for operation of these
instructions.
Table 3.12 Channel A and Channel B Host Bus Emulation Interface Configured Pin Descriptions
For a functional description of this mode, please refer to section 4.7 MCU Host Bus Emulation Mode.
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3.2 56-pin VQFN Package
The 56-pin VQFN with lower pin count and small size package is also available for FT2232H. The
differences exist on power/ground and pin number for each pin. The part number is as FT2232H-56Q to
distinguish from the 64-pin package type. All the functions are supported in the 56-pin VQFN package.
The pin numbering is illustrated in the schematic symbol shown in Figure 3.2.
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3.2.1 Schematic Symbol for FT4232H-56Q
Figure 3.2 FT2232H-56Q Schematic Symbol
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3.2.2 Pin Descriptions for FT2232H-56Q
This section describes the operation of the FT2232H-56Q pins for 56-pin VQFN package. The function of
many pins is determined by the configuration of the FT2232H-56Q. The following table details the
function of each pin dependent on the configuration of the interface. Each of the functions is described in
Table 3.13. (Note: The convention used throughout this document for active low signals is the signal
name followed by#).
Pins marked ** default to tri-stated inputs with an internal 75KΩ (approx.) pull up resistor to VCCIO.
FT2232H-56Q
Pin
Pin functions (depends on configuration)
Pin
#
Pin Name
ASYNC
Serial
(RS232)
245 FIFO
SYNC
245 FIFO
ASYNC
Bit-bang
SYNC
Bit-bang
MPSSE
Fast
Serial
interface
CPU
Style
FIFO
Host Bus
Emulatio
n
Channel A
12
ADBUS0
TXD
D0
D0
D0
D0
TCK/SK
USES
CHANNEL
B
D0
AD0
13
ADBUS1
RXD
D1
D1
D1
D1
TDI/DO
D1
AD1
14
ADBUS2
RTS#
D2
D2
D2
D2
TDO/DI
D2
AD2
15
ADBUS3
CTS#
D3
D3
D3
D3
TMS/CS
D3
AD3
17
ADBUS4
DTR#
D4
D4
D4
D4
GPIOL0
D4
AD4
18
ADBUS5
DSR#
D5
D5
D5
D5
GPIOL1
D5
AD5
19
ADBUS6
DCD#
D6
D6
D6
D6
GPIOL2
D6
AD6
20
ADBUS7
RI#
D7
D7
D7
D7
GPIOL3
D7
AD7
22
ACBUS0
TXDEN
RXF#
RXF#
**
**
GPIOH0
CS#
A8
23
ACBUS1
**
TXE#
TXE#
WRSTB#
WRSTB#
GPIOH1
A0
A9
24
ACBUS2
**
RD#
RD#
RDSTB#
RDSTB#
GPIOH2
RD#
A10
25
ACBUS3
RXLED#
WR#
WR#
**
**
GPIOH3
WR#
A11
26
ACBUS4
TXLED#
SIWUA
SIWUA
SIWUA
SIWUA
GPIOH4
SIWUA
A12
27
ACBUS5
**
CLKOUT
**
**
**
GPIOH5
**
A13
28
ACBUS6
**
OE#
**
**
**
GPIOH6
**
A14
29
ACBUS7
**
**
**
**
**
GPIOH7
**
A15
Channel B
32
BDBUS0
TXD
D0
D0
D0
TCK/SK
FSDI
D0
CS#
33
BDBUS1
RXD
D1
D1
D1
TDI/DO
FSCLK
D1
ALE
34
BDBUS2
RTS#
D2
D2
D2
TDO/DI
FSDO
D2
RD#
35
BDBUS3
CTS#
D3
D3
D3
TMS/CS
FSCTS
D3
WR#
37
BDBUS4
DTR#
D4
D4
D4
GPIOL0
D4
IORDY
38
BDBUS5
DSR#
D5
D5
D5
GPIOL1
D5
CLKOUT
39
BDBUS6
DCD#
D6
D6
D6
GPIOL2
D6
I/O0
40
BDBUS7
RI#
D7
D7
D7
GPIOL3
D7
I/O1
42
BCBUS0
TXDEN
RXF#
**
**
GPIOH0
CS#
**
46
BCBUS1
**
TXE#
WRSTB#
WRSTB#
GPIOH1
A0
**
47
BCBUS2
**
RD#
RDSTB#
RDSTB#
GPIOH2
RD#
**
48
BCBUS3
RXLED#
WR#
**
**
GPIOH3
WR#
**
49
BCBUS4
TXLED#
SIWUB
SIWUB
SIWUB
GPIOH4
SIWUB
SIWUB
**
51
BCBUS5
**
**
**
**
GPIOH5
**
**
52
BCBUS6
**
**
**
**
GPIOH6
**
**
53
BCBUS7
PWRSAV#
PWRSAV#
PWRSAV#
PWRSAV#
PWRSAV#
GPIOH7
PWRSAV#
PWRSAV#
PWRSAV#
54
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
PWREN#
30
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
SUSPEND
#
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Configuration memory interface
1
EECS
56
EECLK
55
EEDATA
Table 3.13 FT2232H Pin Configurations for 56-pin VQFN package
3.2.3 Common Pins for FT2232H-56Q
The operation of the following FT2232H-56Q pins are the same regardless of the configured mode:-
Pin No.
Name
Type
Description
2,31
VCORE
POWER
Input
+1.8V input. Core supply voltage input.
16,36,50
VCCIO
POWER
Input
+3.3V input. I/O interface power supply input. Failure to connect all
VCCIO pins will result in failure of the device.
9
VPLL
POWER
Input
+3.3V input. Internal PHY PLL power supply input. It is recommended that
this supply is filtered using an LC filter.
5
VPHY
POWER
Input
+3.3V Input. Internal USB PHY power supply input. Note that this cannot
be connected directly to the USB supply. A +3.3V regulator must be used.
It is recommended that this supply is filtered using an LC filter.
44
VREGIN
POWER
Input
+3.3V Input. Integrated 1.8V voltage regulator input.
43
VREGOUT
POWER
Output
+1.8V Output. Integrated voltage regulator output. Connect to VCORE with
3.3uF filter capacitor.
21,41,45
GND
POWER
Input
0V Ground input.
Table 3.14 Power and Ground for 56-pin VQFN package
Pin No.
Name
Type
Description
3
OSCI
INPUT
Oscillator input.
4
OSCO
OUTPUT
Oscillator output.
6
REF
INPUT
Current reference – connect via a 12KΩ resistor @ 1% to GND.
7
DM
I/O
USB Data Signal Minus.
8
DP
I/O
USB Data Signal Plus.
10
TEST
INPUT
IC test pin – for normal operation should be connected to GND.
11
RESET#
INPUT
Reset input (active low).
54
PWREN#
OUTPUT
Active low power-enable output.
PWREN# = 0: Normal operation.
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PWREN# =1: USB SUSPEND mode or device has not been configured.
This can be used by external circuitry to power down logic when device is
in USB suspend or has not been configured.
30
SUSPEND#
OUTPUT
Active low when USB is in suspend mode.
53
PWRSAV#
INPUT
USB Power Save input. This is an EEPROM configurable option used when
the FT2232H is used in a self-powered mode and is used to prevent forcing
current down the USB lines when the host or hub is powered off.
PWRSAV# = 1 : Normal Operation
PWRSAV# = 0: FT2232H forced into SUSPEND mode.
PWRSAV# can be connected to GND (via a 10KΩ resistor) and another
resistor (e.g. 4K7) connected to the VBUS of the USB connector. When this
input goes high, then it indicates to the FT2232H that it is connected to a
host PC. When the host or hub is powered down then the FT2232H is held
in SUSPEND mode.
Table 3.15 Common Function pins for 56-pin VQFN package
Pin No.
Name
Type
Description
1
EECS
I/O
EEPROM – Chip Select. Tri-State during device reset.
56
EECLK
OUTPUT
Clock signal to EEPROM. Tri-State during device reset. When not in reset, this
outputs the EEPROM clock.
55
EEDATA
I/O
EEPROM – Data I/O Connect directly to Data-In of the EEPROM and to Data-Out
of the EEPROM via a 2.2K resistor. Also, pull Data-Out of the EEPROM to VCC via
a 10K resistor for correct operation. Tri-State during device reset.
Table 3.16 EEPROM Interface Group for 56-pin VQFN package
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3.2.4 Configured Pins for FT2232H-56Q
The following sections describe the function of the configurable pins referred to Table 3.13 which is
determined by how the FT2232H is configured.
3.2.4.1 FT2232H-56Q pins used in an RS232 interface
The FT2232H-56Q channel A or channel B can be configured as an RS232 interface. When configured in
this mode, the pins used and the descriptions of the signals are shown in Table 3.17.
Channel A
Pin No.
Channel B
Pin No.
Name
Type
RS232 Configuration Description
12
32
TXD
OUTPUT
TXD = transmitter output
13
33
RXD
INPUT
RXD = receiver input
14
34
RTS#
OUTPUT
RTS# = Ready To send handshake output
15
35
CTS#
INPUT
CTS# = Clear To Send handshake input
17
37
DTR#
OUTPUT
DTR# = Data Transmit Ready modem signaling line
18
38
DSR#
INPUT
DSR# = Data Set Ready modem signaling line
19
39
DCD#
INPUT
DCD# = Data Carrier Detect modem signaling line
20
40
RI#
INPUT
RI# = Ring Indicator Control Input. When the Remote Wake
up option is enabled in the EEPROM, taking RI# low can be
used to resume the PC USB Host controller from suspend.
(Also see note 1, 2, 3 in section 4.12)
22
42
TXDEN
OUTPUT
TXDEN = (TTL level). For use with RS485 level converters.
25
48
RXLED#
OUTPUT
RXLED = Receive signaling output when data is transferred
from FT2232H to USB Host. Pulses low when receiving data
(RXD) via USB. This should be connected to an LED.
26
49
TXLED#
OUTPUT
TXLED = Transmit signaling output when data is transferred
from USB Host to FT2232H. Pulses low when transmitting
data (TXD) via USB. This should be connected to an LED.
Table 3.17 Channel A and Channel B RS232 Configured Pin Descriptions for FT4232H-56Q
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3.2.4.2 FT2232H-56Q pins used in an FT245 Style Synchronous FIFO Interface
The FT2232H-56Q only channel A can be configured as a FT245 style synchronous FIFO interface. When
configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.18. To
enter this mode the external EEPROM must be set to make port A 245 mode. A software command (Set
Bit Mode option) is then sent by the application to the FTDI driver to tell the chip to enter single channel
synchronous FIFO mode. In this mode the ‘B’ channel is not available as all resources have been switched
onto channel A. In this mode, data is written or read on the rising edge of the CLKOUT.
Channel A
Pin No.
Name
Type
FT245 Configuration Description
20,19,18,17,
15,14,13,12
ADBUS[7:0]
I/O
D7 to D0 bidirectional FIFO data. This bus is normally input unless OE#
is low.
22
RXF#
OUTPUT
When high, do not read data from the FIFO. When low, there is data
available in the FIFO which can be read by driving RD# low. When in
synchronous mode, data is transferred on every clock that RXF# and
RD# are both low. Note that the OE# pin must be driven low at least 1
clock period before asserting RD# low.
23
TXE#
OUTPUT
When high, do not write data into the FIFO. When low, data can be
written into the FIFO by driving WR# low. When in synchronous mode,
data is transferred on every clock that TXE# and WR# are both low.
24
RD#
INPUT
Enables the current FIFO data byte to be driven onto D0...D7 when
RD# goes low. The next FIFO data byte (if available) is fetched from
the receive FIFO buffer each CLKOUT cycle until RD# goes high.
25
WR#
INPUT
Enables the data byte on the D0...D7 pins to be written into the
transmit FIFO buffer when WR# is low. The next FIFO data byte is
written to the transmit FIFO buffer each CLKOUT cycle until WR# goes
high.
27
CLKOUT
OUTPUT
60 MHz Clock driven from the chip. All signals should be synchronized
to this clock.
28
OE#
INPUT
Output enable when low to drive data onto D0-7. This should be driven
low at least 1 clock period before driving RD# low to allow for data
buffer turn-around.
26
SIWU
INPUT
The Send Immediate / WakeUp signal combines two functions on a
single pin. If USB is in suspend mode (PWREN# = 1) and remote
wakeup is enabled in the EEPROM, strobing this pin low will cause the
device to request a resume on the USB Bus. Normally, this can be used
to wake up the Host PC.
During normal operation (PWREN# = 0), if this pin is strobed low any
data in the device TX buffer will be sent out over USB on the next Bulk-
IN request from the drivers regardless of the pending packet size. This
can be used to optimize USB transfer speed for some applications. Tie
this pin to VCCIO if not used. (Also see note 1, 2, 3 in section 4.12)
Table 3.18 Channel A FT245 Style Synchronous FIFO Configured Pin Descriptions for FT4232H-
56Q
For a functional description of this mode, please refer to section 4.4
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3.2.4.3 FT2232H-56Q pins used in an FT245 Style Asynchronous FIFO Interface
The FT223-56Q channel A or channel B can be configured as a FT245 asynchronous FIFO interface. When
configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.19. To
enter this mode the external EEPROM must be set to make port A or B or both 245 mode. In this mode,
data is written or read on the falling edge of the RD# or WR# signals.
Channel A
Pin No.
Channel B
Pin No.
Name
Type
FT245 Configuration Description
20,19,18,17,
15,14,13,12
40,39,38,37,
35,34,33,32
Channel A =
ADBUS[7:0]
Channel B =
BDBUS[7:0]
I/O
D7 to D0 bidirectional FIFO data. This bus is normally input
unless RD# is low.
22
42
RXF#
OUTPUT
When high, do not read data from the FIFO. When low,
there is data available in the FIFO which can be read by
driving RD# low. When RD# goes high again RXF# will
always go high and only become low again if there is
another byte to read. During reset this signal pin is tri-
state, but pulled up to VCCIO via an internal 200kΩ
resistor.
23
46
TXE#
OUTPUT
When high, do not write data into the FIFO. When low, data
can be written into the FIFO by strobing WR# high, then
low. During reset this signal pin is tri-state, but pulled up to
VCCIO via an internal 200kΩ resistor.
24
47
RD#
INPUT
Enables the current FIFO data byte to be driven onto
D0...D7 when RD# goes low. Fetches the next FIFO data
byte (if available) from the receive FIFO buffer when RD#
goes high.
25
48
WR#
INPUT
Writes the data byte on the D0...D7 pins into the transmit
FIFO buffer when WR# goes from high to low.
26
49
SIWU
INPUT
The Send Immediate / WakeUp signal combines two
functions on a single pin. If USB is in suspend mode
(PWREN# = 1) and remote wakeup is enabled in the
EEPROM, strobing this pin low will cause the device to
request a resume on the USB Bus. Normally, this can be
used to wake up the Host PC.
During normal operation (PWREN# = 0), if this pin is
strobed low any data in the device TX buffer will be sent out
over USB on the next Bulk-IN request from the drivers
regardless of the pending packet size. This can be used to
optimize USB transfer speed for some applications. Tie this
pin to VCCIO if not used. (Also see note 1, 2, 3 in section
4.12)
Table 3.19 Channel A and Channel B FT245 Style Asynchronous FIFO Configured Pin
Descriptions for FT4232H-56Q
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3.2.4.4 FT2232H-56Q pins used in a Synchronous or Asynchronous Bit-Bang
Interface
The FT2232H-56Q channel A or channel B can be configured as a synchronous or asynchronous bit-bang
interface. Bit-bang mode is a special FTDI FT2232H device mode that changes the 8 IO lines on either (or
both) channels into an 8 bit bi-directional data bus. There are two types of bit-bang modes: synchronous
and asynchronous.
When configured in any bit-bang mode, the pins used and the descriptions of the signals are shown in
Table 3.20
Channel A
Pin No.
Channel B
Pin No.
Name
Type
Configuration Description
20,19,18,17,
15,14,13,12
40,39,38,37,
35,34,33,32
Channel A = ADBUS[7:0]
Channel B = BDBUS[7:0]
I/O
D7 to D0 bidirectional Bit-Bang parallel I/O
data pins
23
46
WRSTB#
OUTPUT
Write strobe, active low output indicates
when new data has been written to the I/O
pins from the Host PC (via the USB
interface).
24
47
RDSTB#
OUTPUT
Read strobe, this output rising edge
indicates when data has been read from the
parallel I/O pins and sent to the Host PC
(via the USB interface).
26
49
SIWU
INPUT
The Send Immediate / WakeUp signal
combines two functions on a single pin. If
USB is in suspend mode (PWREN# = 1) and
remote wakeup is enabled in the EEPROM,
strobing this pin low will cause the device to
request a resume on the USB Bus.
Normally, this can be used to wake up the
Host PC.
During normal operation (PWREN# = 0), if
this pin is strobed low any data in the device
TX buffer will be sent out over USB on the
next Bulk-IN request from the drivers
regardless of the pending packet size. This
can be used to optimize USB transfer speed
for some applications. Tie this pin to VCCIO
if not used. (Also see note 1, 2, 3 in section
4.12)
Table 3.20 Channel A and Channel B Synchronous or Asynchronous Bit-Bang Configured Pin
Descriptions for FT4232H-56Q
For a functional description of this mode, please refer to section 4.10 Synchronous and Asynchronous Bit-
Bang Interface Mode Description.
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3.2.4.5 FT2232H-56Q pins used in an MPSSE
The FT2232H-56Q channel A and channel B, each have a Multi-Protocol Synchronous Serial Engine
(MPSSE). Each MPSSE can be independently configured to a number of industry standard serial interface
protocols such as JTAG, I2C or SPI, or it can be used to implement a proprietary bus protocol. For
example, it is possible to use one of the FT2232H’s channels to connect to an SRAM configurable FPGA
such as supplied by Altera or Xilinx. The FPGA device would normally be un-configured (i.e. have no
defined function) at power-up. Application software on the PC could use the MPSSE to download
configuration data to the FPGA over USB. This data would define the hardware function on power up. The
other FT2232H channel would be available for another function. Alternatively each MPSSE can be used to
control a number of GPIO pins. When configured in this mode, the pins used and the descriptions of the
signals are shown Table 3.21
Channel A
Pin No.
Channel B
Pin No.
Name
Type
MPSSE Configuration Description
12
32
TCK/SK
OUTPUT
Clock Signal Output. For example:
JTAG – TCK, Test interface clock
SPI – SK, Serial Clock
13
33
TDI/DO
OUTPUT
Serial Data Output. For example:
JTAG – TDI, Test Data Input
SPI – DO
14
34
TDO/DI
INPUT
Serial Data Input. For example:
JTAG – TDO, Test Data output
SPI – DI, Serial Data Input
15
35
TMS/CS
OUTPUT
Output Signal Select. For example:
JTAG – TMS, Test Mode Select
SPI – CS, Serial Chip Select
17
37
GPIOL0
I/O
General Purpose input/output
18
38
GPIOL1
I/O
General Purpose input/output
19
39
GPIOL2
I/O
General Purpose input/output
20
40
GPIOL3
I/O
General Purpose input/output
22
42
GPIOH0
I/O
General Purpose input/output
23
46
GPIOH1
I/O
General Purpose input/output
24
47
GPIOH2
I/O
General Purpose input/output
25
48
GPIOH3
I/O
General Purpose input/output
26
49
GPIOH4
I/O
General Purpose input/output
27
51
GPIOH5
I/O
General Purpose input/output
28
52
GPIOH6
I/O
General Purpose input/output
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29
53
GPIOH7
I/O
General Purpose input/output
Table 3.21 Channel A and Channel B MPSSE Configured Pin Descriptions for FT4232H-56Q
For a functional description of this mode, please refer to section 4.6 MPSSE Interface Mode Description.
3.2.4.6 FT2232H-56Q Pins used as a Fast Serial Interface
The FT2232H-56Q channel B can be configured for use with high-speed optical bi-directional isolated
serial data transfer: Fast Serial Interface. (Not available on channel A). A proprietary FTDI protocol
designed to allow galvanic isolated devices to communicate synchronously with the FT2232H-56Q using
just 4 signal wires (over two dual opto-isolators), and two power lines. The peripheral circuitry controls
the data transfer rate in both directions, whilst maintaining full data integrity. Maximum USB full speed
data rates can be achieved. Both ‘A’ and ‘B’ channels can communicate over the same 4 wire interface if
desired.
When configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.22.
Channel B
Pin No.
Name
Type
Fast Serial Interface Configuration
Description
32
FSDI
INPUT
Fast serial data input.
33
FSCLK
INPUT
Fast serial clock input.
Clock input to FT2232H chip to clock data in
or out.
34
FSDO
OUTPUT
Fast serial data output.
35
FSCTS
OUTPUT
Fast serial Clear To Send signal output.
Driven low to indicate that the chip is ready
to send data
Table 3.22 Channel B Fast Serial Interface Configured Pin Descriptions for FT4232H-56Q
For a functional description of this mode, please refer to section 4.8 Fast Opto-Isolated Serial Interface
Mode Description.
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3.2.4.7 FT2232H-56Q Pins Configured as a CPU-style FIFO Interface
The FT2232H-56Q channel A or channel B can be configured in a CPU-style FIFO interface mode which
allows a CPU to interface to USB via the FT2232H-56Q. This mode is enabled in the external EEPROM.
When configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.23
Channel A
Pin No.
Channel B
Pin No.
Name
Type
Fast Serial Interface Configuration
Description
20,19,18,17,
15,14,13,12
40,39,38,37,
35,34,33,32
Channel A = ADBUS[7:0]
Channel B = BDBUS[7:0]
I/O
D7 to D0 bidirectional data bus
22
42
CS#
INPUT
Active low chip select input
23
46
A0
INPUT
Address bit A0
24
47
RD#
INPUT
Active Low FIFO Read input
25
48
WR#
INPUT
Active Low FIFO Write input
Table 3.23 Channel A and Channel B CPU-style FIFO Interface Configured Pin Descriptions for
FT4232H-56Q
For a functional description of this mode, please refer to section 4.9 CPU-style FIFO Interface Mode
Description.
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3.2.4.8 FT2232H-56Q Pins Configured as a Host Bus Emulation Interface
The FT2232H-56Q can be used to combine channel A and channel B to be configured as a host bus
emulation interface mode which emulates a standard 8048 or 8051 MCU host.
When configured in this mode, the pins used and the descriptions of the signals are shown in Table 3.24
Pin No.
Name
Type
Fast Serial Interface Configuration Description
20,19,18,17,
15,14,13,12
ADBUS[7:0]
I/O
Multiplexed bidirectional Address/Data bus AD7 to AD0
29,28,27,26,
25,24,23,22
A[15:8]
OUTPUT
Extended Address A15 to A8
32
CS#
OUTPUT
Active low chip select device during Read or Write.
33
ALE
OUTPUT
Positive pulse to latch the address
34
RD#
OUTPUT
Active low read output.
35
WR#
OUTPUT
Active low write output. (Data is setup before WR# goes
low, and is held after WR# goes high)
37
IORDY
INPUT
Extends the time taken to perform a Read or Write
operation if driven low. Pull up to VCORE if not being
used.
38
CLKOUT
OUTPUT
Master clock. Outputs the clock signal being used by the
configured interface.
39
I/O0
I/O
MPSSE mode instructions to set / clear or read the high
byte of data can be used with this pin. Please refer to
Application Note AN_108 for operation of these
instructions.
40
I/O1
I/O
MPSSE mode instructions to set / clear or read the high
byte of data can be used with this pin. In addition this
pin has instructions which will make the controller wait
until it is high, or wait until it is low. This can be used to
connect to an IRQ pin of a peripheral chip. The FT2232H
will wait for the interrupt, and then read the device, and
pass the answer back to the host PC. I/O1 must be held
in input mode if this option is used. Please refer to
Application Note AN_108 for operation of these
instructions.
Table 3.24 Channel A and Channel B Host Bus Emulation Interface Configured Pin Descriptions
for FT4232H-56Q
For a functional description of this mode, please refer to section 4.7 MCU Host Bus Emulation Mode.
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4 Function Description
The FT2232H USB 2.0 High Speed (480Mb/s) to UART/FIFO is one of FTDI’s 5th generation of ICs. It has
the capability of being configured in a variety of industry standard serial or parallel interfaces.
The FT2232H has two independent configurable interfaces. Each interface can be configured as UART,
FIFO, JTAG, SPI, I2C or bit-bang mode with independent baud rate generators. In addition to these, the
FT2232H supports a host bus emulation mode, a CPU-Style FIFO mode and a fast opto-isolated serial
interface mode.
4.1 Key Features
USB High Speed to Dual Interface. The FT2232H is a USB 2.0 High Speed (480Mbits/s) to dual
independent flexible and configurable parallel/serial interfaces.
Functional Integration. The FT2232H integrates a USB protocol engine which controls the physical
Universal Transceiver Macrocell Interface (UTMI) and handles all aspects of the USB 2.0 High Speed
interface. The FT222H includes an integrated +1.8V Low Drop-Out (LDO) regulator and 12MHz to 480MHz
PLL. It also includes 4kbytes Tx and Rx data buffers per interface. The FT2232H effectively integrates the
entire USB protocol on a chip with no firmware required.
MPSSE.Multi-Purpose Synchronous Serial Engines (MPSSE), capable of speeds up to 30 Mbits/s, provides
flexible synchronous interface configurations.
Data Transfer rate. The FT2232H supports a data transfer rate up to 12 Mbaud when configured as an
RS232/RS422/RS485 UART interface or greater than 25 Mbytes/second over a synchronous parallel FIFO
interface. Please note the FT2232H does not support the baud rates of 7 Mbaud 9 Mbaud, 10 Mbaud and
11 Mbaud.
Latency Timer. This is really a feature of the driver and is used to as a timeout to flush short packets of
data back to the PC. The default is 16ms, but it can be altered between 0ms and 255ms. At 0ms latency
you get a packet transfer on every high speed microframe.
4.2 Functional Block Descriptions
Dual Multi-Purpose UART/FIFO Controllers. The FT2232H has two independent UART/FIFO
Controllers. These control the UART data, 245 fifo data, opto isolation (Fast Serial) or control the Bit-
Bang mode if selected by SETUP command. Each Multi-Purpose UART/FIFO Controller also contains an
MPSSE (Multi-Protocol Synchronous Serial Engine) which can be used independently of each other. Using
this MPSSE, the Multi-Purpose UART/FIFO Controller can be configured, under software command, to
have 1 MPSSE + 1 UART / 245 FIFO (each UART / 245 can be set to Bit Bang mode to gain extra I/O if
required) or 2 MPSSE.
USB Protocol Engine and FIFO control. The USB Protocol Engine controls and manages the interface
between the UTMI PHY and the FIFOs of the chip. It also handles power management and the USB
protocol specification.
Dual Port FIFO TX Buffer (4Kbytes per interface). Data from the Host PC is stored in these buffers
to be used by the Multi-purpose UART/FIFO controllers. This is controlled by the USB Protocol Engine and
FIFO control block.
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Dual Port FIFO RX Buffer (4Kbytes per interface). Data from the Multi-purpose UART/FIFO
controllers is stored in these blocks to be sent back to the Host PC when requested. This is controlled by
the USB Protocol Engine and FIFO control block.
RESET Generator – The integrated Reset Generator Cell provides a reliable power-on reset to the device
internal circuitry at power up. The RESET# input pin allows an external device to reset the FT2232H.
RESET# should be tied to VCCIO (+3.3v) if not being used.
Independent Baud Rate Generators – The Baud Rate Generators provides an x16 or an x10 clock
input to the UART’s from a 120MHz reference clock and consists of a 14 bit pre-scaler and 4 register bits
which provide fine tuning of the baud rate (used to divide by a number plus a fraction). This determines
the Baud Rate of the UART which is programmable from 183 baud to 12 million baud. The FT2232H does
not support the baud rates of 7 Mbaud 9 Mbaud, 10 Mbaud and 11 Mbaud.
See FTDI application note AN232B-05 on the FTDI website (www.ftdichip.com) for more details.
+1.8V LDO Regulator. The +1.8V LDO regulator generates the +1.8 volts for the core and the USB
transceiver cell. Its input (VREGIN) must be connected to a +3.3V external power source. It is also
recommended to add an external filtering capacitor to the VREGIN. There is no direct connection from the
+1.8V output (VREGOUT) and the internal functions of the FT2232H. The PCB must be routed to connect
VREGOUT to the pins that require the +1.8V including VREGIN.
UTMI PHY. The Universal Transceiver Macrocell Interface (UTMI) physical interface cell. This block
handles the Full speed / High Speed SERDES (serialise – deserialise) function for the USB TX/RX data. It
also provides the clocks for the rest of the chip. A 12 MHz crystal should be connected to the OSCI and
OSCO pins. A 12K Ohm resistor should be connected between REF and GND on the PCB.
The UTMI PHY functions include:
Supports 480 Mbit/s “High Speed” (HS)/ 12 Mbit/s “Full Speed” (FS), FS Only and “Low Speed”
(LS)
SYNC/EOP generation and checking
Data and clock recovery from serial stream on the USB.
Bit-stuffing/unstuffing; bit stuff error detection.
Manages USB Resume, Wake Up and Suspend functions.
Single parallel data clock output with on-chip PLL to generate higher speed serial data clocks.
EEPROM Interface. When used without an external EEPROM the FT2232H defaults to a USB to dual
asynchronous serial port device. Adding an external 93C46 (93C56 or 93C66) EEPROM allows each of the
chip’s channels to be independently configured as a serial UART (RS232 mode), parallel FIFO (245) mode
or fast serial (opto isolation). The external EEPROM can also be used to customise the USB VID, PID,
Serial Number, Product Description Strings and Power Descriptor value of the FT2232H for OEM
applications. Other parameters controlled by the EEPROM include Remote Wake Up, Soft Pull Down on
Power-Off and I/O pin drive strength.
The EEPROM should be a 16 bit wide configuration such as a Microchip 93LC46B or equivalent capable of
a 1Mbit/s clock rate at VCC = +3.00V to 3.6V. The EEPROM is programmable in-circuit over USB using a
utility program called FT_PROG available from FTDI’s web site (www.ftdichip.com). This allows a blank
part to be soldered onto the PCB and programmed as part of the manufacturing and test process.
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If no EEPROM is connected (or the EEPROM is blank), the FT2232H will default to dual serial ports. The
device uses its built-in default VID (0403), PID (6010) Product Description and Power Descriptor Value.
In this case, the device will not have a serial number as part of the USB descriptor.
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4.3 Dual Port FT232 UART Interface Mode Description
The FT2232H can be configured in similar UART modes as the FTDI FT232 devices. The following
examples illustrate how to configure the FT2232H with an RS232, RS422 or RS485 interface. The FT2232
can be configured as a mixture of these interfaces.
4.3.1 Dual Port RS232 Configuration
Figure 4.1 illustrates how the FT2232H can be configured with an RS232 UART interface. This can be
repeated for channel B to provide a dual RS232, but has been omitted for clarity.
GND
1
OSCI
2
OSCO
3
VPHY 4
GND
5
REF
6
DM
7DP
8
VPLL 9
AGND
10
GND
11 VCORE 12
TEST
13
RESET#
14
GND
15
16
17
18
19
VCCIO 20
21
22
23
24
GND
25
26
27
28
29
30
VCCIO 31
32
33
34
GND
35
SUSPEND# 36
VCORE 37
38
39
40
41
VCCIO 42
43
44
45
46
GND
47
48
VREGOUT
49
VREGIN
50
GND
51
52
53
54
VCCIO 56
55
57
58
59
PWREN# 60
EECLK
62 EEDATA
61
EECS
63
VCORE 64
Vin Vout
GND
LDO +3.3V
GND
VBUS 1
D- 2
D+ 3
GND 4
GND
100nF 100nF
100nF 100nF
GND GND GND
GND GND
4.7uF4.7uF
GNDGND +1.8V
+3.3V
+1.8V
+3.3V
100nF 100nF 100nF 100nF 100nF
100nF 100nF
+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V
GND GND GND GND GND GND GND
+3.3V
+3.3V
12K
1K
GND
+3.3V
CS
1
SCL
2
D
3Q4
GND
5
ORG
6
DU 7
VCC 8
93C46
GNDGNDGND
+3.3V
+3.3V
2.2K
10K 10K 10K
1 3
12MHz
EECLK
EEDATA
GND
1
2
3
4
5
6
7
8
9
11
10
CON1
RS232-A
DCD1
RxD1
TxD1
DTR1
GND
DSR1
RTS1
CTS1
RI1
100nF
GND
EECS
PWREN
TTL_TxD1
TTL_RTS1
TTL_RxD1
TTL_CTS1
TTL_DTR1
TTL_DCD1
TTL_DSR1
TTL_RI1
13
V- 3
9
C1-
24
14
12
C1+
28
10
SHDN 22
11
23
V+ 27
VCC 26
GND
25
5
15
19
8
4
6
7
18
17
16
C2+
1
C2-
2
21
20
MAX3241EUI
TTL_TxD1
TTL_RTS1
TTL_DTR1
TTL_RxD1
TTL_CTS1
TTL_DCD1
TTL_DSR1
TTL_RI1
DCD1
RxD1
TxD1
DTR1
DSR1
RTS1
CTS1
RI1
GND
100nF100nF
100nF
100nF
100nF
GND
GND
+3.3V
PWREN# Suspend
SUSPEND
RxD_LED
TxD_LED
220
220
LED1
LED2
+3.3V
+3.3V TxD_LED
RxD_LED
ADBUS0
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
BCBUS0
BCBUS1
BCBUS2
BCBUS3
BCBUS4
BCBUS5
BCBUS6
BCBUS7
ACBUS0
ACBUS1
ACBUS2
ACBUS3
ACBUS4
ACBUS5
ACBUS6
ACBUS7
0Ω
27pF 27pF
3.3uF
Figure 4.1 RS232 Configuration
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4.3.2 Dual Port RS422 Configuration
Figure 4.2 illustrates how the FT2232H can be configured as a dual RS422 interface.
Figure 4.2 Dual RS422 Configuration
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In this case both channel A and channel B are configured as UART operating at TTL levels and a level
converter device (full duplex RS485 transceiver) is used to convert the TTL level signals from the
FT2232H to RS422 levels. The PWREN# signal is used to power down the level shifters such that they
operate in a low quiescent current when the USB interface is in suspend mode.
4.3.3 Dual Port RS485 Configuration
Figure 4.3 illustrates how the FT2232H can be configured as a dual RS485 interface.
Figure 4.3 Dual RS485 Configuration
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In this case both channel A and channel B are configured as RS485 operating at TTL levels and a level
converter device (half duplex RS485 transceiver) is used to convert the TTL level signals from the
FT232H to RS485 levels. It has separate enables on both the transmitter and receiver. With RS485, the
transmitter is only enabled when a character is being transmitted from the UART. The TXDEN pins on the
FT2232H are provided for exactly that purpose, and so the transmitter enables are wired to the TXDEN’s.
The receiver enable is active low, so it is wired to the PWREN# pin to disable the receiver when in USB
suspend mode.
RS485 is a multi-drop network – i.e. many devices can communicate with each other over a single two
wire cable connection. The RS485 cable requires to be terminated at each end of the cable. Links are
provided to allow the cable to be terminated if the device is physically positioned at either end of the
cable.
In this example the data transmitted by the FT2232H is also received by the device that is transmitting.
This is a common feature of RS485 and requires the application software to remove the transmitted data
from the received data stream. With the FT2232H it is possible to do this entirely in hardware – simply
modify the schematic so that RXD of the FT2232H is the logical OR of the level converter device receiver
output with TXDEN using an HC32 or similar logic gate.
With the FT2232H it is possible to do this entirely in hardware – simply modify the schematic so that RXD
of the FT2232H is the logical OR of the level converter device receiver output with TXDEN using an HC32
or similar logic gate.
4.4 FT245 Synchronous FIFO Interface Mode Description
When channel A is configured in an FT245 Synchronous FIFO interface mode the IO timing of the signals
used are shown in Figure 4.4, which shows details for read and write accesses. The timings are shown in
Table 4.1
.
Note that only a read or a write cycle can be performed at any one time. Data is read or written on the
rising edge of the CLKOUT clock.
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Figure 4.4 FT245 Synchronous FIFO Interface Signal Waveforms
Name
Minimum
Typical
Maximum
Units
Description
t1
16.67
16.67
ns
CLKOUT period
t2
7.5
8.33
9.17
ns
CLKOUT high period
t3
7.5
8.33
9.17
ns
CLKOUT low period
t4
1
7.15
ns
CLKOUT to RXF#
t5
1
7.15
ns
CLKOUT to read DATA valid
t6
1
7.15
ns
OE# to read DATA valid
t7
8
16.67
ns
OE# setup time
T8
0
ns
OE# hold time
T9
8
16.67
ns
RD# setup time to CLKOUT (RD# low afterOE# low)
T10
0
ns
RD# hold time
t11
1
7.15
ns
CLKOUT TO TXE#
t12
8
16.67
ns
Write DATA setup time
t13
0
ns
Write DATA hold time
t14
8
16.67
ns
WR# setup time to CLKOUT (WR# low after TXE# low)
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t15
0
ns
WR# hold time
Table 4.1 FT245 Synchronous FIFO Interface Signal Timings
This single channel mode uses a synchronous interface to get high data transfer speeds. The chip drives a
60 MHz CLKOUT clock for the external system to use.
Note that Asynchronous FIFO mode must be selected on both channels before selecting the Synchronous
FIFO mode in software.
4.4.1 FT245 Synchronous FIFO Read Operation
A read operation is started when the chip drives RXF# low. The external system can then drive OE# low
to turn around the data bus drivers before acknowledging the data with the RD# signal going low. The
first data byte is on the bus after OE# is low. The external system can burst the data out of the chip by
keeping RD# low or it can insert wait states in the RD# signal. If there is more data to be read it will
change on the clock following RD# sampled low. Once all the data has been consumed, the chip will drive
RXF# high. Any data that appears on the data bus, after RXF# is high, is invalid and should be ignored.
4.4.2 FT245 Synchronous FIFO Write Operation
A write operation can be started when TXE# is low. WR# is brought low when the data is valid. A burst
operation can be done on every clock providing TXE# is still low. The external system must monitor TXE#
and its own WR# to check that data has been accepted. Both TXE# and WR# must be low for data to be
accepted.
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4.5 FT245 Asynchronous FIFO Interface Mode Description
The FT2232H can be configured as a dual channel asynchronous FIFO interface. This mode is similar to
the synchronous FIFO interface with the exception that the data is written to or read from the FIFO on
the falling edge of the WR# or RD# signals.
This mode does not provide a CLKOUT signal and it does not expect an OE# input signal. The following
diagrams illustrate the asynchronous FIFO mode timing.
Figure 4.5 FT245 asynchronous FIFO Interface READ Signal Waveforms
Figure 4.6 FT245 asynchronous FIFO Interface WRITE Signal Waveforms
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Name
Minimum
Typical
Maximum
Units
Description
t1
1
14
ns
RD# inactive to RX#
t2
49
ns
RXF# inactive after RD# cycle
t3
1
14
ns
RD# to DATA
t4
30
ns
RD# active pulse width
t5
0
ns
RD# active after RXF#
t6
1
14
ns
WR# active to TXE# inactive
t7
49
ns
TXE# inactive after WR# cycle
t8
5
ns
DATA to WR# active setup time
t9
5
ns
DATA hold time after WR# inactive
t10
30
ns
WR# active pulse width
t11
0
ns
WR# active after TXE#
Table 4.2 Asynchronous FIFO Timings (based on standard drive level outputs)
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4.6 MPSSE Interface Mode Description.
MPSSE Mode is designed to allow the FT2232H to interface efficiently with synchronous serial protocols
such as JTAG, I2C and SPI Bus. It can also be used to program SRAM based FPGA’s over USB. The
MPSSE interface is designed to be flexible so that it can be configured to allow any synchronous serial
protocol (industry standard or proprietary) to be implemented using the FT2232H. MPSSE is available on
channel A and channel B.
MPSSE is fully configurable, and is programmed by sending commands down the data stream. These can
be sent individually or more efficiently in packets. MPSSE is capable of a maximum sustained data rate of
30 Mbits/s.
When a channel is configured in MPSSE mode, the IO timing and signals used are shown in Figure 4.7
and Table 4.3 These show timings for CLKOUT=30MHz. CLKOUT can be divided internally to be provide a
slower clock.
Figure 4.7 MPSSE Signal Waveforms
Name Minimum Typical Maximum Units Description
t1 33.33 ns CLKOUT period
t2 15 16.67 ns CLKOUT high period
t3 15 16.67 ns CLKOUT low period
t4 1 7.15 ns CLKOUT to TDI/DO delay
t5 0ns TDO/DI hold time
t6 11 TDO/DI setup time
Table 4.3 MPSSE Signal Timings
MPSSE mode is enabled using Set Bit Bang Mode driver command. A hex value of 2 will enable it, and a
hex value of 0 will reset the device. See application note AN2232L-02, “Bit Mode Functions for the
FT2232D” for more details and examples.
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The MPSSE command set is fully described in application note AN_108 – “Command Processor for
MPSSE and MCU Host Bus Emulation Modes”.
The following additional application notes are available for configuring the MPSSE:
AN_109 – “Programming Guide for High Speed FTCI2C DLL”
AN_110 – “Programming Guide for High Speed FTCJTAG DLL”
AN_111 – “Programming Guide for High Speed FTCSPI DLL”
4.6.1 MPSSE Adaptive Clocking
Adaptive clocking is a new MPSSE feature added to the FT2232H MPSSE engine.
The mode is effectively handshaking the CLK signal with a return clock RTCK. This is a technique used by
ARM processors.
The FT2232H will assert the CLK line and wait for the RTCK to be returned from the target device to
GPIOL3 line before changing the TDO (data out line).
FT2232H ARM CPU
RTCK
TCK
TDO
GPIOL3
Figure 4.8 Adaptive Clocking Interconnect
TDO
TCK
RTCK
TDO changes on falling
edge of TCK
Figure 4.9: Adaptive Clocking waveform.
Adaptive clocking is not enabled by default.
See: AN_108 Command Processor for MPSSE and MCU Host Bus Emulation Modes.
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4.7 MCU Host Bus Emulation Mode
MCU host bus emulation mode uses both of the FT2232H’s A and B channel interfaces to make the chip
emulate a standard 8048/8051 MCU host bus. This allows peripheral devices for these MCU families to be
directly connected to USB via the FT2232H.
The lower 8 bits (AD7 to AD0) is a multiplexed Address / Data bus. A15 to A8 provide upper (extended)
addresses. There are 4 basic operations:-
1) Read (does not change A15 to A8)
2) Read Extended (changes A15 to A8)
3) Write (does not change A15 to A8)
4) Write Extended (changes A15 to A8)
MCU Host Bus Emulation mode is enabled using Set Bit Bang Mode driver command. A hex value of 8 will
enable it, and a hex value of 0 will reset the device. The FT2232H operates in the same way as the
FT2232D. See application note AN2232-02, “Bit Mode Functions for the FT2232D” for more details
and examples.
The MCU Host Bus Emulation Mode command set is fully described in application note AN_108 –
“Command Processor for MPSSE and MCU Host Bus Emulation Modes”.
When MCU Host Bus Emulation mode is enabled the IO signal lines on both channels work together and
the pins are configured as described in Table 3.12. The following sections give some details of the read
and write cycle waveforms and timings. The CLKOUT output clock can operate up to 60MHz.
In Host Bus Emulation mode the clock divisor has no effect. The clock divisor is used for serial data and is
a different part of the MPSSE block. In host bus emulation the 60MHz clock is always output and doesn’t
change with any commands.
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4.7.1 MCU Host Bus Emulation Mode Signal Timing – Write Cycle
Figure 4.10 MCU Host Bus Emulation Mode Signal Waveforms – write cycle
Table 4.4 MCU Host Bus Emulation Mode Signal Timings – write cycle
When Div By 5 is on the device will return 2 bytes when doing a read. When it is off the device will return 1
byte when doing a read. The clock period is 16.67 nS so most devices would need the Div By 5 to be set on.
IORDY can be held low permanently to extend all cycles.
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4.7.2 MCU Host Bus Emulation Mode Signal Timing – Read Cycle
Figure 4.11 MCU Host Bus Emulation Mode Signal Waveforms – read cycle
Table 4.5 MCU Host Bus Emulation Mode Signal Timings– read cycle
When Div By 5 is on the device will return 2 bytes when doing a read. When it is off the device will return
1 byte when doing a read. The clock period is 16.67 nS so most devices would need the Div By 5 to be
set on. IORDY can be held low permanently to extend all cycles.
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An example of the MCU Host Emulation Interface enabling a USB interface to CAN Bus using a CANBus
Controller is shown in Figure 4.12.
I/O0
I/O1
IORDY#
FT2232HSJA1000
CANBus
Controller
ADDRESS / DATA BUS
AD[7:0]
WR#
RD#
AD[7:0]
CS#
WR#
ALE
RD#
CS#
ALE/AS
Vcc
MODE
Vcc
INT#
Rx
Tx CANBus
Transeiver
CAN
Bus
Figure 4.12 MCU Host Emulation Example using a CANBus Controller
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4.8 Fast Opto-Isolated Serial Interface Mode Description
Fast Opto-Isolated Serial Interface Mode provides a method of communicating with an external device
over USB using 4 wires that can have opto-isolators in their path, thus providing galvanic isolation
between systems. If either channel A or channel B is enabled in Fast Opto-Isolated Serial mode then the
pins on channel B are switched to the fast serial interface configuration. The I/O interface for fast serial
mode is always on channel B, even if both channels are being used in this mode. An address bit is used
to determine the source or destination channel of the data. It therefore makes sense to always use at
least channel B or both for fast serial mode, but not A own its own.
Fast serial mode is enabled by setting the appropriate bits in the external EEPROM. The fast serial mode
can be held in reset by setting a bit value of 10 using the Set Bit Bang Mode command. While this bit is
set the device is held reset – data can be sent to the device, but it will not be sent out by the device until
the device is enabled again. This is done by sending a bit value of 0 using the set bit mode command.
See application note AN2232L-02, “Bit Mode Functions for the FT2232D” for more details and
examples.
When either Channel B or both Channel A and B are configured in Fast Opto-Isolated Serial Interface
mode the IO timing of the signals used are shown in Figure 4.13 and the timings are shown in Table
4.6
Figure 4.13 Fast Opto-Isolated Serial Interface Signal Waveforms
Name Minimum Typical Maximu Units Description
t1 5ns FSDO/FSCTS hold time
t2 5ns FSDO/FSCTS setup time
t3 5ns FSDI hold time
t4 10 ns FSDI Setup Time
t5 10 ns FSCLK low
t6 10 ns FSCLK high
t7 20 ns FSCLK Period
Table 4.6 Fast Opto-Isolated Serial Interface Signal Timings
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4.8.1 Outgoing Fast Serial Data
To send fast serial data out of the FT2232H, the external device must drive the FSCLK clock. If the
FT2232H has data ready to send, it will drive FSDO output low to indicate the start bit. It will not do this
if it is currently receiving data from the external device. This is illustrated in Figure 4.14.
FSCLK
FSDO 0D0 D1 D2 D3 D4 D5 D6 D7 SRCE
Start
Bit Data Bits - LSB first Source
Bit
Figure 4.14 Fast Opto-Isolated Serial Interface Output Data
Notes :-
1. The first bit output (Start bit) is always 0.
2. FSDO is always sent LSB first.
3. The last serial bit output is the source bit (SRCE). It indicates which channel the data has come
from. A ‘0’ means that it has come from Channel A, a ‘1’ means that it has come from Channel B.
4. If the target device is unable to accept the data when it detects the START bit, it should stop the
FSCLK until it can accept the data.
4.8.2 Incoming Fast Serial Data
An external device is allowed to send data into the FT2232H if FSCTS is high. On receipt of a zero START
bit on FSDI, the FT2232H will drop FSCTS on the next positive clock edge. The data from bits 0 to 7 are
then clocked in (LSB first). The last bit (DEST) determines where the data will be written to. The data can
be sent to either channel A or to channel B. If DEST= ‘0’, the data is sent to channel A, (assuming
channel A is enabled for fast serial mode, otherwise the data is sent to channel B). If DEST= ‘1’ the data
is sent to channel B, (assuming channel B is enabled for fast serial mode, otherwise the data will go to
channel A. (Either channel A, channel B or both channels must be enabled as fast serial mode or the
function is disabled). This is illustrated in Figure 4.15.
FSCLK
FSDI 0D0 D1 D2 D3 D4 D5 D6 D7 DEST
Start
Bit Data Bits - LSB first Destination
Bit
FSCTS
Figure 4.15 Fast Opto-Isolated Serial Interface Input Data
Notes :-
1. The first bit input (Start bit) is always 0.
2. FSDI is always received LSB first.
3. The last received serial bit is the destination bit (DEST).It indicates which channel the data should
go to. A ‘0’ means that it should go to channel A, a ‘1’ means that it should go to channel B.
4. The target device should ensure that CTS is high before it sends data. CTS goes low after data bit
0 (D0) and stays low until the chip can accept more data.
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4.8.3 Fast Opto-Isolated Serial Data Interface Example
The following example, Figure 4.16 , shows two Agilent HCPL-2430 (see the semiconductor section at
www.agilent.com) high speed opto-couplers used to optically isolate an external device which
interfaced to USB using the FT2232H. In this example VCC5V is the USB VBUS supply and VCCE is the
supply to the external device.
Care must be taken with the voltage used to power the photo-LED’s. It must be the same voltage as that
the FT2232H I/Os are driving to, or the LED’s may be permanently on. Limiting resistors should be fitted
in the lines that drive the diodes. The outputs of the opto-couplers are open-collector and require a pull-
up resistor.
FT2232H
FSDI
FSCLK
FSDO
FSCTS
VCC5V
HCPL-2430
VCCE
HCPL-2430
1K 1K
1K
1K
470R
470R
470R
470R
VCCE
Cable
DI
CLK
DO
CTS
VCC5V
1
2
3
4
5
6
7
8
1
2
3
45
6
7
8
Figure 4.16 Fast Opto-Isolated Serial Interface Example
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4.9 CPU-style FIFO Interface Mode Description
CPU-style FIFO interface mode is designed to allow a CPU to interface to USB via the FT2232H. This mode
is enabled in the external EEPROM. The interface is achieved using a chip select bit (CS#) and address bit
(A0). When either Channel A or Channel B are in CPU-style Interface mode the IO signal lines are
configured as given in Table 3.11.
This mode uses a combination of CS# and A0 to determine the operation to be carried out. The following
truth-table, Table 4.7, gives the decode values for particular operations.
CS#
A0
RD#
WR#
1
X
X
X
0
0
Read Data Pipe
Write Data Pipe
0
1
Read Status
Send Immediate
Table 4.7 CPU-Style FIFO Interface Operation Select
The Status read is shown in Table 4.8
Data Bit
Data
Status
bit 0
1
Data available (=RXF)
bit 1
1
Space available (=TXE)
bit 2
1
Suspend
bit 3
1
Configured
bit 4
X
X
bit 5
X
X
bit 6
X
X
bit 7
X
X
Table 4.8 CPU-Style FIFO Interface Operation Read Status Description
Note that bits 7 to 4 can be arbitrary values and that X= not used.
The timing of reading and writing in this mode is shown in Figure 4.17 and Table 4.9.
CS#
WR#
RD#
A0
Valid
Valid Valid
Valid
t3
t1
t2
t4
t5
t6
t7
D7..0
Figure 4.17 CPU-Style FIFO Interface Operation Signal Waveforms.
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Name Minimum Typical Maximum Units Description
t1 15 ns A0 / CS Setup to WR#
t2 15 ns Data setup to WR#
t3 20 ns WR# Pulse width
t4 5ns A0/CS Hold from WR#
t5 5ns Data hold from WR#
t6 15 ns A0/CS Setup to RD#
t7 15 50 ns
Data delay from RD#
t8 5ns A0/CS hold from RD#
t9 030 ns Data hold time from RD#
Table 4.9 CPU-Style FIFO Interface Operation Signal Timing.
An example of the CPU-style FIFO interface connection is shown in Figure 4.18
D0
D1
D2
D3
D4
D5
D6
D7
RD#
SI / WU
CS#
WR#
A0
FT2232H
IO10
IO11
IO12
IO13
IO14
IO15
IO16
IO17
IO20
IO24
IO23
IO21
IO22
Microcontroller
IO Port 1
IO Port 2
( Optional )
PWREN#IO25
( Optional )
Channel A
or B
Figure 4.18 CPU-Style FIFO Interface Example
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4.10 Synchronous and Asynchronous Bit-Bang Interface Mode
Description
The FT2232H channel A or channel B can be configured as a bit-bang interface. There are two types of
bit-bang modes: synchronous and asynchronous.
Asynchronous Bit-Bang Mode
Asynchronous Bit-Bang mode is the same as BM-style Bit-Bang mode, except that the internal RD# and
WR# strobes (RDSTB# and WRSTB#) are now brought out of the device to allow external logic to be
clocked by accesses to the bit-bang IO bus.
On either or both channels any data written to the device in the normal manner will be self clocked onto
the data pins (those which have been configured as outputs). Each pin can be independently set as an
input or an output. The rate that the data is clocked out at is controlled by the baud rate generator.
For the data to change there has to be new data written, and the baud rate clock has to tick. If no new
data is written to the channel, the pins will hold the last value written.
Synchronous Bit-Bang Mode
The synchronous Bit-Bang mode will only update the output parallel port pins whenever data is sent from
the USB interface to the parallel interface. When this is done, the WRSTB# will activate to indicate that
the data has been read from the USB Rx FIFO buffer and written out on the pins. Data can only be
received from the parallel pins (to the USB Tx FIFO interface) when the parallel interface has been
written to.
With Synchronous Bit-Bang mode data will only be sent out by the FT2232H if there is space in the
FT2232H USB TXFIFO for data to be read from the parallel interface pins. This Synchronous Bit-Bang
mode will read the data bus parallel I/O pins first, before it transmits data from the USB RxFIFO. It is
therefore 1 byte behind the output, and so to read the inputs for the byte that you have just sent,
another byte must be sent.
For example :-
(1) Pins start at 0xFF
Send 0x55,0xAA
Pins go to 0x55 and then to 0xAA
Data read = 0xFF,0x55
(2) Pins start at 0xFF
Send 0x55,0xAA,0xAA
(repeat the last byte sent)
Pins go to 0x55 and then to 0xAA
Data read = 0xFF,0x55,0xAA
Synchronous Bit-Bang Mode differs from Asynchronous Bit-Bang mode in that the device parallel output
is only read when the parallel output is written to by the USB interface. This makes it easier for the
controlling program to measure the response to a USB output stimulus as the data returned to the USB
interface is synchronous to the output data.
Asynchronous Bit-Bang mode is enabled using Set Bit Bang Mode driver command. A hex value of 1 will
enable Asynchronous Bit-Bang mode.
Synchronous Bit-Bang mode is enabled using Set Bit Bang Mode driver command. A hex value of 4 will
enable Synchronous Bit-Bang mode.
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See application note AN2232-02, “Bit Mode Functions for the FT2232” for more details and
examples of using the bit-bang modes.
An example of the synchronous bi-bang mode timing is shown in Figure 4.19
WRSTB#
RDSTB#
Figure 4.19 Synchronous Bit-Bang Mode Timing Interface Example
Name Description
t1 Current pin state is read
t2 RDSTB# is set inactive and data on the paralle I/O pins is read and sent to the USB host.
t3 RDSTB# is set active again, and any pins that are output will change to their new data
t4 1 clock cycle to allow for data setup
t5
WRSTB# goes active. This indicates that the host PC has written new data to the I/O parallel data pins
t6
WRSTB# goes inactive
Table 4.10 Synchronous Bit-Bang Mode Timing Interface Example Timings
WRSTB# = this output indicates when new data has been written to the I/O pins from the Host PC (via
the USB interface).
RDSTB# = this output rising edge indicates when data has been read from the I/O pins and sent to the
Host PC (via the USB interface).
The WRSTB# goes active in t4. The WRSTB# goes active when data is read from the USB RXFIFO (i.e.
sent from the PC). The RDSTB# goes inactive when data is sampled from the pins and written to the USB
TXFIFO (i.e. sent to the PC). The SETUP command to the FT2232H is used to setup the bit-mode. This
command also contains a byte wide data mask to set the direction of each bit. The direction on each pin
doesn’t change unless a new SETUP command is used to modify the direction.
The WRSTB# and RDSTB# strobes is only a guide to what may be happening depending on the direction
of the bus. For example if all pins are configured as inputs, it is still necessary to write to these pins in
order to get the FT2232H to read those pins even though the data written will never appear on the pins.
Signals and data-flow are illustrated in Figure 4.20
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USB Rx
FIFO/
Buffer
Parallel I/O
data
Parallel
I/O pins
USB
WRSTB#
RDSTB#
USB Tx
FIFO/
Buffer
Figure 4.20 Bit-bang Mode Dataflow Illustration Diagram.
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4.11 RS232 UART Mode LED Interface Description
When configured in UART mode the FT2232H has two IO pins on each channel dedicated to controlling
LED status indicators, one for transmitted data the other for received data. When data is being
transmitted / received the respective pins drive from tri-state to low in order to provide indication on the
LED’s of data transfer. A digital one-shot timer is used so that even a small percentage of data transfer is
visible to the end user.
FT2232H
TXLED#
RXLED#
VCCIO
220R220R
TX RX
Figure 4.21 Dual LED UART Configuration
Figure 4.21 shows a configuration using two individual LED’s – one for transmitted data the other for
received data.
FT2232H
TXLED#
RXLED#
VCCIO
220R
LED
Figure 4.22 Single LED UART Configuration
In Figure 4.22 Single LED UART Configuration
the transmit and receive LED indicators are wire-OR’ed together to give a single LED indicator which
indicates any transmit or receive data activity.
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Note that the LED’s are connected to the same supply as VCCIO.
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4.12 Send Immediate / Wake Up (SIWU#)
The SIWU# function is available in the FIFO modes and in bit bang mode.
The Send Immediate portion is used to flush data from the chip back to the PC. This can be used to get
short packets of data back to the PC without waiting for the latency timer to expire.
This mechanism should only be used when you have stopped sending data to the chip to avoid overrun.
The data transfer is flagged to the USB host by the falling edge of the signal.
CLKOUT
WR#
SIWU#
D7-D0
Figure 4.23 Using SIWU#
When the pin is being used for a Wake Up function to wake up a sleeping PC a 20ms negative pulse on
this pin is required. When the pin is being used to flush the buffer (Send Immediate), a 250ns negative
pulse on this pin is required.
Notes
1. When using remote wake-up, ensure the resistors are pulled-up in suspend. Also ensure
peripheral designs do not allow any current sink paths that may partially power the peripheral.
2. If remote wake-up is enabled, a peripheral is allowed to draw up to 2.5mA in suspend. If remote
wake-up is disabled, the peripheral must draw no more than 500uA in suspend.
3. If a Pull-down is enabled, the FT2232H will not wake up from suspend.
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4.13 FT2232H Mode Selection
The 2 channels of the FT2232H reset to 2 asynchronous serial interfaces.
Following a reset the required mode of each channel is determined by the contents of the EEPROM
(programmed using FT_PROG).
The EEPROM contents determine if the 2 channels have been configured as FT232 asynchronous serial
interface, FT245 FIFO interface, CPU-style FIFO interface or Fast Serial Interface.
Following a reset, the EEPROM is read to determine which mode is configured. After device enumeration,
an FT_SetBitMode command (refer to D2XX_Programmers_Guide) can be sent to the USB driver to
switch the selected interface into the required mode – asynchronous bit-bang, synchronous bit-bang or
MPSSE.
When in FT245 FIFO mode, the FT_SetBitMode command can be used to select either Synchronous
FIFO (FT_SetBitMode = 0x40) or Asynchronous FIFO mode. (Note that Asynchronous FIFO mode must
be selected on both channels before selecting the Synchronous FIFO mode. This means that an EEPROM
is needed to initially configure Asynchronous FIFO mode before software configures the Synchronous
FIFO mode).
When Synchronous FIFO mode selected, channel A uses all the memory resources of channel B. As such
channel B is then not available. In this case the state of the channel B pins is determined when the
configuration is switched to Asynchronous FIFO mode. If channel B had not been used for any data
transfer before configuration of Asynchronous FIFO mode, then the channel B pins will remain in their
default mode (D7:0=tri-stated but pulled high trough 75K resistor, TXE# =low, RXF# =high. RD# and
WR# are inputs and should be pulled high). An MPSSE command, set_data_bits can be used to
configure the channel B pins as inputs before configuring channel A as Synchronous FIFO. This avoids the
channel B pins driving against any interfaces (such as SPI) which may have been configured previous to
any switching of channel A to Synchronous FIFO mode. Refer to
http://www.ftdichip.com/Documents/AppNotes/AN2232C-01_MPSSE_Cmnd.pdf for the set_data_bits
command and further information on the MPSSE used in MCU Host BUS Emulation mode.
The MPSSE can be configured directly using the D2XX commands. The D2XX_Programmers_Guide is
available from the FTDI website at
http://www.ftdichip.com/Documents/ProgramGuides/D2XX_Programmer’s_Guide(FT_000071).pdf
The application note AN_108 – “Command Processor For MPSSE and MCU Host Bus Emulation
Modes” gives further explanation and examples for the MPSSE.
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4.13.1 Do I need an EEPROM?
The following Table 4.11 summarises what modes are configurable using the EEPROM or the application
software.
ASYNC
Serial
UART
ASYNC
245
FIFO
SYNC
245
FIFO
ASYN
C Bit-
bang
SYNC
Bit-
bang
MPSSE
Fast
Serial
interface
CPU-
Style
FIFO
Host Bus
Emulation
EEPROM
configured
YES
YES
YES
YES
YES
Application
Software
configured
YES
YES
YES
YES
YES
Table 4.11 Configuration Using EEPROM and Application Software
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5 Devices Characteristics and Ratings
5.1 Absolute Maximum Ratings
The absolute maximum ratings for the FT2232H devices are as follows. These are in accordance with the
Absolute Maximum Rating System (IEC 60134). Exceeding these values may cause permanent damage to
the device.
Parameter
Value
Unit
Storage Temperature
-65°C to 150°C
Degrees C
Floor Life (Out of Bag) At Factory Ambient
(30°C / 60% Relative Humidity)
168 Hours
(IPC/JEDEC J-STD-033A MSL Level 3
Compliant)*
Hours
Ambient Operating Temperature (Power Applied)
-40°C to 85°C
Degrees C
MTTF FT2232HL
TBD
hours
MTTF FT2232HQ
TBD
hours
VCORE Supply Voltage
-0.3 to +2.0
V
VCCIO IO Voltage
-0.3 to +4.0
V
DC Input Voltage – USBDP and USBDM
-0.5 to +3.63
V
DC Input Voltage – High Impedance
Bi-directional (CBUS & DBUS powered from
VCCIO)
-0.3 to +5.8
V
DC Input Voltage – All Other Inputs
-0.5 to + (VCCIO +0.5)
V
DC Output Current – Outputs
16
mA
Table 5.1 Absolute Maximum Ratings
* If devices are stored out of the packaging beyond this time limit the devices should be baked before
use. The devices should be ramped up to a temperature of +125°C and baked for up to 17 hours.
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5.2 DC Characteristics
The I/O pins are +3.3v cells, which are +5V tolerant (except the USB PHY pins).
DC Characteristics (Ambient Temperature = -40°C to +85°C)
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
VCORE
VCC Core Operating
Supply Voltage
1.62
1.80
1.98
V
VCCIO*
VCCIO Operating
Supply Voltage
2.97
3.30
3.63
V
Cells are 5V
tolerant
VREGIN
VREGIN Voltage
regulator Input
3.00
3.30
3.60
V
VREGOUT
Voltage regulator
Output
1.71
1.80
1.89
V
Ireg
Regulator Current
150
mA
VREGIN +3.3V
Icc1
Core Operating
Supply Current
---
70
---
mA
VCORE = +1.8V
Normal
Operation
Icc1r
Core Reset Supply
Current
---
5
---
mA
VCORE = +1.8V
Device in reset
state
Icc1s
Core Suspend
Supply Current
500
µA
VCORE = +1.8V
USB Suspend
Table 5.2 Operating Voltage and Current (except PHY)
*NOTE: Failure to connect all VCCIO pins will result in failure of the device.
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The I/O pins are +3.3v cells, which are +5V tolerant (except the USB PHY pins).
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Voh
Output Voltage High
2.40
3.14
V
Ioh = +/-2mA
I/O Drive strength*
= 4mA
3.20
V
I/O Drive strength*
= 8mA
3.22
V
I/O Drive strength*
= 12mA
3.22
V
I/O Drive strength*
= 16mA
Vol
Output Voltage Low
0.18
0.40
V
Iol = +/-2mA
I/O Drive strength*
= 4mA
0.12
V
I/O Drive strength*
= 8mA
0.08
V
I/O Drive strength*
= 12mA
0.07
V
I/O Drive strength*
= 16mA
Vil
Input low Switching
Threshold
-
0.80
V
LVTTL
Vih
Input High Switching
Threshold
2.00
-
V
LVTTL
Vt
Switching Threshold
1.50
V
LVTTL
Vt-
Schmitt trigger negative
going threshold voltage
0.80
1.10
-
V
Vt+
Schmitt trigger positive
going threshold voltage
1.60
2.00
V
Rpu
Input pull-up resistance
40
75
190
KΩ
Vin = 0
Rpd
Input pull-down
resistance
40
75
190
KΩ
Vin =VCCIO
Iin
Input Leakage Current
15
45
85
μA
Vin = 0
Ioz
Tri-state output leakage
current
+/-10
μA
Vin = 5.5V or 0
Table 5.3 I/O Pin Characteristics VCCIO = +3.3V (except USB PHY pins)
* The I/O drive strength and slow slew-rate are configurable in the EEPROM.
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DC Characteristics (Ambient Temperature = -40°C to +85°C)
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
VPHY,
VPLL
PHY Operating Supply
Voltage
3.0
3.3
3.6
V
3.3V I/O
Iccphy
PHY Operating Supply
Current
---
30
60
mA
High-speed operation
at 480 MHz
Iccphy
(susp)
PHY Operating Supply
Current
---
10
50
μA
USB Suspend
Table 5.4 PHY Operating Voltage and Current
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Voh
Output Voltage High
VCORE-
0.2
V
Vol
Output Voltage Low
0.2
V
Vil
Input low Switching
Threshold
-
0.8
V
Vih
Input High Switching
Threshold
2.0
-
V
Table 5.5 PHY I/O Pin Characteristics
5.3 ESD Tolerance
ESD protection for FT2232H IO’s
Parameter
Reference
Minimum
Typical
Maximum
Units
Human Body Model
(HBM)
JEDEC EIA/JESD22-
A114-B, Class 2
±2kV
kV
Machine Mode (MM)
JEDEC EIA/JESD22-
A115-A, Class B
±200V
V
Charge Device Model
(CDM)
JEDEC EIA/ JESD22-C101-
D, Class-III
±500V
V
Latch-up
JESD78, Trigger Class-II
±200mA
mA
Table 5.6 ESD Tolerance
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5.4 Thermal Characteristics
Parameter
Minimum
Typical
Maximum
Units
ѲJA (FT2232HL)
37.66
°C/W
ѲJC (FT2232HL)
8.39
°C/W
ѲJA (FT2232HQ)
29.67
°C/W
ѲJC (FT2232HQ)
14.12
°C/W
TJ (FT2232HL/FT2232HQ)
-40
25
125
°C
Table 5.7 Thermal Characteristics
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6 FT2232H Configurations
The following sections illustrate possible USB power configurations for the FT2232H.
All USB power configurations illustrated apply to both package options for the FT2232H device
6.1 USB Bus Powered Configuration
Bus Powered Application example 1: Bus powered configuration
GND 1
OSCI
2
OSCO
3
VPHY
4
GND 5
REF
6
DM
7
DP
8
VPLL
9
AGND 10
GND 11
VCORE
12
TEST
13
RESET#
14
GND 15
ADBUS0 16
17
18
19
VCCIO
20
21
22
23
24
GND 25
26
27
28
29
30
VCCIO
31
32
33
34
GND 35
SUSPEND# 36
VCORE
37
38
39
40
41
VCCIO
42
43
44
45
46
GND 47
48
VREGOUT
49
VREGIN
50
GND 51
52
53
54
VCCIO
56
55
57
58
59
PWREN# 60
EECLK
62
EEDATA
61
EECS
63
VCORE
64
Vin Vout
GND
LDO +3.3V
GND
VBUS 1
D- 2
D+ 3
GND 4
100nF 100nF
100nF 100nF
GND GND GND
GND GND
4.7uF4.7uF
GNDGND +1.8V
+3.3V
+1.8V
+3.3V
100nF 100nF 100nF 100nF 100nF
100nF 100nF
+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V
GND GND GND GND GND GND GND
+3.3V
+3.3V
12K
1K
GND
+3.3V
CS
1
SCL
2D
3Q4
GND
5
ORG
6
DU 7
VCC 8
93C46
GNDGNDGND
+3.3V
+3.3V
2.2K
10K 10K 10K
1 3
12MHz
EECLK
EEDATA
GND
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
ACBUS0
ACBUS1
ACBUS2
ACBUS3
ACBUS4
ACBUS5
ACBUS6
ACBUS7
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
BCBUS0
BCBUS1
BCBUS2
BCBUS3
BCBUS4
BCBUS5
BCBUS6
BCBUS7
0ΩGND
27pF 27pF
3.3uF
Figure 6.1 Bus Powered Configuration Example 1
Figure 6.1 illustrates the FT2232H in a typical USB bus powered design configuration. A USB bus powered
device gets its power from the USB bus. In this application, the FT2232H requires that the VBUS (USB
+5V) is regulated down to +3.3V (using an LDO) to supply the VCCIO, VPLL, VPHY and VREGIN.
VREGIN is the +3.3V input to the on chip +1.8V regulator. The output of the on chip LDO regulator
(+1.8V) drives the FT2232H core supply (VCORE). This requires a minimum of a 3.3uF filter capacitor.
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Bus Powered Application example 2: Bus powered configuration (with additional 1.8V LDO voltage
regulator for VCORE)
VBUS 1
D- 2
D+ 3
GND 4
100nF 100nF
GND GND
4.7uF4.7uF
GNDGND +1.8V +3.3V
100nF 100nF 100nF 100nF 100nF
100nF 100nF
+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V
GND GND GND GND GND GND GND
+3.3V
+3.3V
12K
1K
GND
+3.3V
CS
1
SCL
2D
3Q4
GND
5
ORG
6
DU 7
VCC 8
93C46
GNDGNDGND
+3.3V
+3.3V
2.2K
10K10K10K
1 3
12MHz
EECLK
EEDATA
GND
Vin Vout
GND
LDO +1.8V
GND
+1.8V
100nF
GND
100nF
GND
GND 1
OSCI
2
OSCO
3
VPHY
4
GND 5
REF
6
DM
7
DP
8
VPLL
9
AGND 10
GND 11
VCORE
12
TEST
13
RESET#
14
GND 15
ADBUS0 16
17
18
19
VCCIO
20
21
22
23
24
GND 25
26
27
28
29
30
VCCIO
31
32
33
34
GND 35
SUSPEND# 36
VCORE
37
38
39
40
41
VCCIO
42
43
44
45
46
GND 47
48
VREGOUT
49
VREGIN
50
GND 51
52
53
54
VCCIO
56
55
57
58
59
PWREN# 60
EECLK
62
EEDATA
61
EECS
63
VCORE
64
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
ACBUS0
ACBUS1
ACBUS2
ACBUS3
ACBUS4
ACBUS5
ACBUS6
ACBUS7
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
BCBUS0
BCBUS1
BCBUS2
BCBUS3
BCBUS4
BCBUS5
BCBUS6
BCBUS7
0? GND
27pF 27pF
Vin Vout
GND
LDO +3.3V
GND
100nF 100nF
GND GND
+3.3V
Figure 6.2 Bus Powered Configuration Example 2
Figure 6.32 illustrates the FT2232H in a typical USB bus powered configuration similar to Figure 6.1. The
difference here is that the +1.8V for the FT2232H core (VCORE) has been regulated from the VBUS as
well as the +3.3V supply to the VPLL, VPHY, VCCIO and VREGIN.
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6.2 USB Self Powered Configuration
Self-Powered application example 1: Self powered configuration
Vin Vout
GND
LDO +3.3V
GND
VBUS 1
D- 2
D+ 3
GND 4
100nF 100nF 3.3uF
100nF 100nF
GND GND GND
GND GND
4.7uF4.7uF
GNDGND +1.8V
+3.3V
+1.8V
+3.3V
100nF 100nF 100nF 100nF 100nF
100nF 100nF
+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V
GND GND GND GND GND GND GND
+3.3V
+3.3V
12K
1K
GND
+3.3V
CS
1
SCL
2D
3Q4
GND
5
ORG
6
DU 7
VCC 8
93C46
GNDGNDGND
+3.3V
+3.3V
2.2K
10K10K10K
1 3
12MHz
EECLK
EEDATA
GND
1
2
Ext. Power Supply
GND
GND 1
OSCI
2
OSCO
3
VPHY
4
GND 5
REF
6
DM
7
DP
8
VPLL
9
AGND 10
GND 11
VCORE
12
TEST
13
RESET#
14
GND 15
ADBUS0 16
17
18
19
VCCIO
20
21
22
23
24
GND 25
26
27
28
29
30
VCCIO
31
32
33
34
GND 35
SUSPEND# 36
VCORE
37
38
39
40
41
VCCIO
42
43
44
45
46
GND 47
48
VREGOUT
49
VREGIN
50
GND 51
52
53
54
VCCIO
56
55
57
58
59
PWREN# 60
EECLK
62
EEDATA
61
EECS
63
VCORE
64
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
ACBUS0
ACBUS1
ACBUS2
ACBUS3
ACBUS4
ACBUS5
ACBUS6
ACBUS7
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
BCBUS0
BCBUS1
BCBUS2
BCBUS3
BCBUS4
BCBUS5
BCBUS6
BCBUS7
0? GND
27pF 27pF
VBUS
VBUS
GND
10K
4.7K
Figure 6.3 Self Powered Configuration Example 1
Figure 6.3 illustrates the FT2232H in a typical USB self-powered configuration. A USB self-powered device
gets its power from its own power supply and does not draw current from the USB bus. In this example
an external power supply is used. This external supply is regulated to +3.3V.
Note that in this set-up, the EEPROM should be configured for self-powered operation and the option
“suspend on DBUS7 low” selected in FT_PROG. Also this configuration uses the pin BCBUS7, so this
assumes that MPSSE mode is not selected.
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Self-Powered application example 2: Self powered configuration (with additional 1.8V LDO voltage
regulator for VCORE)
VBUS 1
D- 2
D+ 3
GND
100nF 100nF
GND GND
4.7uF4.7uF
GNDGND +1.8V +3.3V
100nF 100nF 100nF 100nF 100nF
100nF 100nF
+1.8V +1.8V +1.8V +3.3V +3.3V +3.3V +3.3V
GND GND GND GND GND GND GND
+3.3V
+3.3V
12K
1K
GND
+3.3V
27pF
CS
1
SCL
2D
3Q4
GND
5
ORG
6
DU 7
VCC 8
93C46
GNDGNDGND
+3.3V
+3.3V
2.2K
10K10K10K
1 3
12MHz
EECLK
EEDATA
GND
Vin Vout
GND
LDO +1.8V
GND
+1.8V
100nF
GND
100nF
GND
1
2
Ext. Power Supply
GND
GND 1
OSCI
2
OSCO
3
VPHY
4
GND 5
REF
6
DM
7
DP
8
VPLL
9
AGND 10
GND 11
VCORE
12
TEST
13
RESET#
14
GND 15
ADBUS0 16
17
18
19
VCCIO
20
21
22
23
24
GND 25
26
27
28
29
30
VCCIO
31
32
33
34
GND 35
SUSPEND# 36
VCORE
37
38
39
40
41
VCCIO
42
43
44
45
46
GND 47
48
VREGOUT
49
VREGIN
50
GND 51
52
53
54
VCCIO
56
55
57
58
59
PWREN# 60
EECLK
62
EEDATA
61
EECS
63
VCORE
64
ADBUS1
ADBUS2
ADBUS3
ADBUS4
ADBUS5
ADBUS6
ADBUS7
ACBUS0
ACBUS1
ACBUS2
ACBUS3
ACBUS4
ACBUS5
ACBUS6
ACBUS7
BDBUS0
BDBUS1
BDBUS2
BDBUS3
BDBUS4
BDBUS5
BDBUS6
BDBUS7
BCBUS0
BCBUS1
BCBUS2
BCBUS3
BCBUS4
BCBUS5
BCBUS6
BCBUS7
0? GND
27pF
VBUS
GND
10K
4.7K
VBUS
Vin Vout
GND
LDO +3.3V
GND
100nF 100nF
GND GND
+3.3V
Figure 6.4 Self Powered Configuration Example 2
Figure 6.4 illustrates the FT2232H in a typical USB self-powered configuration similar to Figure 6.3. The
difference here is that the +1.8V for the FT2232H core has been regulated from the external power
supply.
Note that in this set-up, the EEPROM should be configured for self-powered operation and the option
“suspend on DBUS7 low” selected in FT_PROG. Also this configuration uses the pin BCBUS7, so this
assumes that MPSSE mode is not selected.
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6.3 Oscillator Configuration
OSCI
OSCO
2
3
FT2232H
Crystal
12MHz
27pF
27pF
Figure 6.5 Recommended FT2232H Crystal Oscillator Configuration.
Figure 6.5 illustrates how to connect the FT2232H with a 12MHz ± 0.003% crystal. In this case loading
capacitors should to be added between OSCI, OSCO and GND as shown. A value of 27pF is shown as the
capacitor in the example – this will be good for many crystals but it is recommended to select the loading
capacitor value based on the manufacturer’s recommendations wherever possible. It is recommended to
use a parallel cut type crystal.
It is also possible to use a 12 MHz Oscillator with the FT2232H. In this case the output of the oscillator
would drive OSCI, and OSCO should be left unconnected. The oscillator must have a CMOS output drive
capability.
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
OSCI Vin
Input Voltage
2.97
3.30
3.63
V
FIn
Input Frequency
12
MHz
+/- 30ppm
Ji
Cycle to cycle jitter
< 150
pS
Table 6.1 OSCI Input characteristics
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7 EEPROM Configuration
If an external EEPROM is fitted (93LC46/56/66) it can be programmed over USB using FT_PROG. The
EEPROM must be 16 bits wide and capable or working at a VCC supply of +3.0 to +3.6 volts.
Adding an external EEPROM allows the chip to be configured as FT232 asynchronous serial interface,
FT245 FIFO interface, CPU-style FIFO interface or Fast Serial Interface.
Figure 7.1 EEPROM Interface
The external EEPROM can also be used to customise the USB VID, PID, Serial Number, Product
Description Strings and Power Descriptor value of the FT2232H for OEM applications. Other parameters
controlled by the EEPROM include Remote Wake Up, Soft Pull Down on Power-Off and I/O pin drive
strength.
If the FT2232H is used without an external EEPROM the chip defaults to a USB to FT232 asynchronous
serial interface port device. If no EEPROM is connected (or the EEPROM is blank), the FT2232H uses its
built-in default VID (0403), PID (6010) Product Description and Power Descriptor Value. In this case, the
device will not have a serial number as part of the USB descriptor.
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7.1 Default EEPROM Configuration
The external EEPROM (if it’s fitted) can be programmed over USB using FT_PROG. This allows a blank
part to be soldered onto the PCB and programmed as part of the manufacturing and test process. Users
who do not have their own USB Vendor ID but who would like to use a unique Product ID in their design
can apply to FTDI for a free block of unique PIDs.
See TN_100 USB Vendor ID/Product ID Guidelines for more information.
Parameter
Value
Notes
USB Vendor ID (VID)
0403h
FTDI default VID (hex)
USB Product UD (PID)
6010h
FTDI default PID (hex)
bcd Device
0700h
Serial Number Enabled?
Yes
Serial Number
None
Pull down I/O Pins in USB
Suspend
Disabled
Enabling this option will make the device pull
down on the UART interface lines when in USB
suspend mode (PWREN# is high).
Manufacturer Name
FTDI
Product Description
Dual RS232-HS
Max Bus Power Current
500mA
Power Source
Bus Powered
Device Type
FT2232H
USB Version
0200h
Returns USB 2.0 device description to the host.
Remote Wake Up
Disabled
Taking RI# low will wake up the USB host
controller from suspend in approximately 20
ms. If enabled.
Hardware Interface
UART
Allows the user to select the hardware mode of
the device. Options include: UART, 245 FIFO,
CPU 245, OPTO Isolate.
Suspend ACBus7 Low
Disabled
Enters low power state on ACBus7.
High Current I/Os
Disabled
Enables the high drive level on the UART and
ACBUS I/O pins.
Load VCP Driver
Enabled
Makes the device load the VCP driver interface
for the device.
Table 7.1 Default Configuration with a blank/no EEPROM
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8 Package Parameters
The FT2232H is available in two different packages. The FT2232HL is the LQFP-64 option and the
FT2232HQ is the QFN-64 package option. The solder reflow profile for both packages is described in
Section 8.4. See TN_166 FTDI Example IC Footprints for PCB footprint guidelines.
8.1 FT2232HQ, QFN-64 Package Dimensions
FTDI
YYWW -A
XXXXXXXXXXXX
FT2232HQ
1
64
Indicates Pin
#1 (Laser
Marked)
Top View
16
17 32
33
48
49
9.000+/- 0.075
9.000+/- 0.075
Line 1 – FTDI Logo
Line 2 – Date Code and Revision
Line 3 – Wafer Lot Number
Line 4 – FTDI Part Number
Figure 8.1 64 pin QFN Package Details
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Notes:
1. All dimensions are in mm.
2. Pin 1 ID can be combination of DOT AND/OR Chamfer.
3. Pin 1 ID and bottom central solder pad are connected to each other, but NOT to the internal ground of the
device. Connect the central solder pad (4.35 x 4.35mm) to GND.
4. Pin 1 ID can be connected to system ground, but it is not recommended using this as the only ground point
for the device.
5. Optional Chamfer on corner leads.
6. There are exposed bonding strain relief pads surrounding the central solder pad. These are connected to the
respective pad around the device perimeter. This area must be considered as a “keep out” area for tracks &
vias.
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8.2 FT2232HL, LQFP-64 Package Dimensions
FTDI
YYWW
-A
XXXXXXXXXXXX
FT2232HL
1
64
Indicates Pin
#1 (Laser
Marked)
Top View
16
17 32
33
48
49
10.000+/- 0.1
10.000+/- 0.1
Line 1 – FTDI Logo
Line 2 – Date Code and Revision
Line 3 – Wafer Lot Number
Line 4 – FTDI Part Number
Dimensions are body
dimensions (mm)
64
17
1
16
32
33
48
49
D1
E1
D
E
0.25
1.60
M A X
12 o+/- 1 o
1.4 +/- 0.0 5
0.2 Min
0.6 +/- 0.15
1.0
0.05 Min
0.15 Max
b
c
b1
c1
e
Figure 8.2 64 pin LQFP Package Details
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SYMBOL
MIN
NOM
MAX
D
11.8
12
12.2
D1
9.9
10
10.1
E
11.8
12
12.2
E1
9.9
10
10.1
b
0.17
0.22
0.27
c
0.09
0.2
b1
0.17
0.2
0.23
c1
0.09
0.16
e
0.5 BSC
Table 8.1 64 pin LQFP Package Details – dimensions (in mm)
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8.3 FT2232H-56Q, VQFN-56 Package Dimensions
Top View Bottom View
Figure 8.3 56-pin VQFN Package Details for FT2232H-56Q
Notes:
1. All dimensions are in mm.
2. Pin 1 IDENTFICATION can be combination of DOT AND/OR Chamfer.
3. The internal ground of the device is connected to the bottom side central solder pad whose dimension
is 6.10 x 6.10mm. This central solder pad must be connected to the ground of the system.
FTDI
YYWW -C
XXXXXXXXXXXX
FT2232H-56Q
Line 1 – FTDI Logo
Line 2 – Date Code and Revision
Line 3 – Wafer Lot Number
1
56
Line 4 – FTDI Part Number
15
28
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8.4 Solder Reflow Profile
Critical Zone: when
T is in the range
T to T
Temperature, T (Degrees C)
Time, t (seconds)
25 P
T = 25º C to T
tp
Tp
TL
t
Preheat
S
tL
Ramp Up Lp
Ramp
Down
T Max
S
T Min
S
Figure 8.4 FT2232H Solder Reflow Profile
Profile Feature
Pb Free Solder Process
(green material)
SnPb Eutectic and Pb free (non
green material) Solder Process
Average Ramp Up Rate (Ts to Tp)
3°C / second Max.
3°C / Second Max.
Preheat
- Temperature Min (Ts Min.)
- Temperature Max (Ts Max.)
- Time (ts Min to ts Max)
150°C
200°C
60 to 120 seconds
100°C
150°C
60 to 120 seconds
Time Maintained Above Critical Temperature
TL:
- Temperature (TL)
- Time (tL)
217°C
60 to 150 seconds
183°C
60 to 150 seconds
Peak Temperature (Tp)
260°C
see Table 8.3
Time within 5°C of actual Peak Temperature
(tp)
30 to 40 seconds
20 to 40 seconds
Ramp Down Rate
6°C / second Max.
6°C / second Max.
Time for T= 25°C to Peak Temperature, Tp
8 minutes Max.
6 minutes Max.
Table 8.2 Reflow Profile Parameter Values
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SnPb Eutectic and Pb free (non green material)
Package Thickness
Volume mm3 < 350
Volume mm3 >=350
< 2.5 mm
235 +5/-0 deg C
220 +5/-0 deg C
≥ 2.5 mm
220 +5/-0 deg C
220 +5/-0 deg C
Pb Free (green material) = 260 +5/-0 deg C
Table 8.3 Package Reflow Peak Temperature
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9 Contact Information
Head Office – Glasgow, UK
Branch Office – Tigard, Oregon, USA
Future Technology Devices International Limited
Unit 1, 2 Seaward Place, Centurion Business Park
Glasgow G41 1HH
United Kingdom
Tel: +44 (0) 141 429 2777
Fax: +44 (0) 141 429 2758
Future Technology Devices International Limited (USA)
7130 SW Fir Loop
Tigard, OR 97223-8160
USA
Tel: +1 (503) 547 0988
Fax: +1 (503) 547 0987
E-mail (Sales)
sales1@ftdichip.com
E-mail (Sales)
us.sales@ftdichip.com
E-mail (Support)
support1@ftdichip.com
E-mail (Support)
us.support@ftdichip.com
E-mail (General Enquiries)
admin1@ftdichip.com
E-mail (General Enquiries)
us.admin@ftdichip.com
Branch Office – Taipei, Taiwan
Branch Office – Shanghai, China
Future Technology Devices International Limited (Taiwan)
2F, No. 516, Sec. 1, NeiHu Road
Taipei 114
Taiwan , R.O.C.
Tel: +886 (0) 2 8797 1330
Fax: +886 (0) 2 8751 9737
Future Technology Devices International Limited (China)
Room 1103, No. 666 West Huaihai Road,
Shanghai, 200052
China
Tel: +86 21 62351596
Fax: +86 21 62351595
E-mail (Sales)
tw.sales1@ftdichip.com
E-mail (Sales)
cn.sales@ftdichip.com
E-mail (Support)
tw.support1@ftdichip.com
E-mail (Support)
cn.support@ftdichip.com
E-mail (General Enquiries)
tw.admin1@ftdichip.com
E-mail (General Enquiries)
cn.admin@ftdichip.com
Web Site
http://ftdichip.com
Distributor and Sales Representatives
Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and sales
representative(s) in your country.
System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future Technology Devices
International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level performance
requirements. All application-related information in this document (including application descriptions, suggested FTDI devices and other
materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this information is subject to customer
confirmation, and FTDI disclaims all liability for system designs and for any applications assistance provided by FTDI. Use of FTDI
devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to defend, indemnify and hold
harmless FTDI from any and all damages, claims, suits or expense resulting from such use. This document is subject to change without
notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Neither the whole
nor any part of the information contained in, or the product described in this document, may be adapted or reproduced in any material
or electronic form without the prior written consent of the copyright holder. Future Technology Devices International Ltd, Unit 1, 2
Seaward Place, Centurion Business Park, Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC136640
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Appendix A – References
Document References
AN_113, “Interfacing FT2232H Hi-Speed Devices To I2C Bus
AN_109 – “Programming Guide for High Speed FTCI2C DLL”
AN_110 – “Programming Guide for High Speed FTCJTAG DLL
AN_111 – “Programming Guide for High Speed FTCSPI DLL
AN114 – “Interfacing FT2232H Hi-Speed Devices To SPI Bus
AN135 – MPSSE Basics
AN108 - Command Processor For MPSSE and MCU Host Bus Emulation Modes
TN_104, “Guide to Debugging Customers Failed Driver Installation
TN_100 USB Vendor ID/Product ID Guidelines
TN_166 FTDI Example IC Footprints
AN2232-02, “Bit Mode Functions for the FT2232
FT_PROG EEPROM Programming Utility
Acronyms and Abbreviations
Terms
Description
CDM
Charge Device Model
CMOS
Complementary Metal Oxide Semiconductor
ESD
Electrostatic Discharge
EHCI
Extensible Host Controller Interface
EEPROM
Electrically Erasable Programmable Read-Only Memory
FIFO
First In First Out
FPGA
Field-Programmable Gate Array
HBM
Human Body Model
IC
Integrated Circuit
I²C
Inter Integrated Circuit
JTAG
Joint Test Action Group
LDO
Low Drop Out
LED
Light Emitting Diode
LQFP
Low profile Quad Flat Package
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MM
Machine Mode
MCU
Microcontroller Unit
MPSSE
Multi-Protocol Synchronous Serial Engine
OHCI
Open Host Controller Interface
PLD
Programmable Logic Device
QFN
Quad Flat No-Lead
SPI
Serial Peripheral Interface
USB
Universal Serial Bus
UART
Universal Asynchronous Receiver/Transmitter
UHCI
Universal Host Controller Interface
UTMI
Universal Transceiver Macrocell Interface
VCP
Virtual COM Ports
VQFN
Very Thin Quad Flat Non-Leaded Package
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Appendix B – List of Figures and Tables
List of Tables
Table 3.1 FT2232H Pin Configurations for 64-pin QFN and LQFP package ........................................... 11
Table 3.2 Power and Ground for 64-pin QFN and LQFP package ........................................................ 11
Table 3.3 Common Function pins for 64-pin QFN and LQFP package .................................................. 12
Table 3.4 EEPROM Interface Group for 64-pin QFN and LQFP package ............................................... 12
Table 3.5 Channel A and Channel B RS232 Configured Pin Descriptions ............................................. 13
Table 3.6 Channel A FT245 Style Synchronous FIFO Configured Pin Descriptions ................................ 14
Table 3.7 Channel A and Channel B FT245 Style Asynchronous FIFO Configured Pin Descriptions.......... 15
Table 3.8 Channel A and Channel B Synchronous or Asynchronous Bit-Bang Configured Pin Descriptions
................................................................................................................................................ 16
Table 3.9 Channel A and Channel B MPSSE Configured Pin Descriptions ............................................. 18
Table 3.10 Channel B Fast Serial Interface Configured Pin Descriptions ............................................. 18
Table 3.11 Channel A and Channel B CPU-style FIFO Interface Configured Pin Descriptions .................. 19
Table 3.12 Channel A and Channel B Host Bus Emulation Interface Configured Pin Descriptions ........... 20
Table 3.13 FT2232H Pin Configurations for 56-pin VQFN package ..................................................... 24
Table 3.14 Power and Ground for 56-pin VQFN package .................................................................. 24
Table 3.15 Common Function pins for 56-pin VQFN package ............................................................ 25
Table 3.16 EEPROM Interface Group for 56-pin VQFN package ......................................................... 25
Table 3.17 Channel A and Channel B RS232 Configured Pin Descriptions for FT4232H-56Q .................. 26
Table 3.18 Channel A FT245 Style Synchronous FIFO Configured Pin Descriptions for FT4232H-56Q ..... 27
Table 3.19 Channel A and Channel B FT245 Style Asynchronous FIFO Configured Pin Descriptions for
FT4232H-56Q ............................................................................................................................. 28
Table 3.20 Channel A and Channel B Synchronous or Asynchronous Bit-Bang Configured Pin Descriptions
for FT4232H-56Q ........................................................................................................................ 29
Table 3.21 Channel A and Channel B MPSSE Configured Pin Descriptions for FT4232H-56Q .................. 31
Table 3.22 Channel B Fast Serial Interface Configured Pin Descriptions for FT4232H-56Q .................... 31
Table 3.23 Channel A and Channel B CPU-style FIFO Interface Configured Pin Descriptions for FT4232H-
56Q .......................................................................................................................................... 32
Table 3.24 Channel A and Channel B Host Bus Emulation Interface Configured Pin Descriptions for
FT4232H-56Q ............................................................................................................................. 33
Table 4.1 FT245 Synchronous FIFO Interface Signal Timings ............................................................ 42
Table 4.2 Asynchronous FIFO Timings (based on standard drive level outputs) ................................... 44
Table 4.3 MPSSE Signal Timings ................................................................................................... 45
Table 4.4 MCU Host Bus Emulation Mode Signal Timings – write cycle ............................................... 48
Table 4.5 MCU Host Bus Emulation Mode Signal Timings– read cycle ................................................. 49
Table 4.6 Fast Opto-Isolated Serial Interface Signal Timings ............................................................ 51
Table 4.7 CPU-Style FIFO Interface Operation Select ....................................................................... 54
Table 4.8 CPU-Style FIFO Interface Operation Read Status Description .............................................. 54
Table 4.9 CPU-Style FIFO Interface Operation Signal Timing. ........................................................... 55
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Table 4.10 Synchronous Bit-Bang Mode Timing Interface Example Timings ........................................ 57
Table 4.11 Configuration Using EEPROM and Application Software .................................................... 63
Table 5.1 Absolute Maximum Ratings ............................................................................................ 64
Table 5.2 Operating Voltage and Current (except PHY) .................................................................... 65
Table 5.3 I/O Pin Characteristics VCCIO = +3.3V (except USB PHY pins) ........................................... 66
Table 5.4 PHY Operating Voltage and Current ................................................................................. 67
Table 5.5 PHY I/O Pin Characteristics ............................................................................................ 67
Table 5.6 ESD Tolerance .............................................................................................................. 67
Table 5.7 Thermal Characteristics ................................................................................................. 68
Table 6.1 OSCI Input characteristics ............................................................................................. 73
Table 8.1 64 pin LQFP Package Details – dimensions (in mm)........................................................... 79
Table 8.2 Reflow Profile Parameter Values ..................................................................................... 81
Table 8.3 Package Reflow Peak Temperature .................................................................................. 82
List of Figures
Figure 2.1 FT2232H Block Diagram ................................................................................................. 5
Figure 3.1 FT2232H Schematic Symbol ............................................................................................ 9
Figure 3.2 FT2232H-56Q Schematic Symbol ................................................................................... 22
Figure 4.1 RS232 Configuration .................................................................................................... 37
Figure 4.2 Dual RS422 Configuration ............................................................................................. 38
Figure 4.3 Dual RS485 Configuration ............................................................................................. 39
Figure 4.4 FT245 Synchronous FIFO Interface Signal Waveforms ...................................................... 41
Figure 4.5 FT245 asynchronous FIFO Interface READ Signal Waveforms ............................................ 43
Figure 4.6 FT245 asynchronous FIFO Interface WRITE Signal Waveforms .......................................... 43
Figure 4.7 MPSSE Signal Waveforms ............................................................................................. 45
Figure 4.8 Adaptive Clocking Interconnect ..................................................................................... 46
Figure 4.9: Adaptive Clocking waveform. ....................................................................................... 46
Figure 4.10 MCU Host Bus Emulation Mode Signal Waveforms – write cycle ....................................... 48
Figure 4.11 MCU Host Bus Emulation Mode Signal Waveforms – read cycle ........................................ 49
Figure 4.12 MCU Host Emulation Example using a CANBus Controller ................................................ 50
Figure 4.13 Fast Opto-Isolated Serial Interface Signal Waveforms .................................................... 51
Figure 4.14 Fast Opto-Isolated Serial Interface Output Data ............................................................ 52
Figure 4.15 Fast Opto-Isolated Serial Interface Input Data ............................................................... 52
Figure 4.16 Fast Opto-Isolated Serial Interface Example .................................................................. 53
Figure 4.17 CPU-Style FIFO Interface Operation Signal Waveforms. .................................................. 54
Figure 4.18 CPU-Style FIFO Interface Example ............................................................................... 55
Figure 4.19 Synchronous Bit-Bang Mode Timing Interface Example ................................................... 57
Figure 4.20 Bit-bang Mode Dataflow Illustration Diagram. ................................................................ 58
Figure 4.21 Dual LED UART Configuration ...................................................................................... 59
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FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
Version 2.5
Document No.: FT_000061 Clearance No.: FTDI#77
Figure 4.22 Single LED UART Configuration .................................................................................... 59
Figure 4.23 Using SIWU# ............................................................................................................ 61
Figure 6.1 Bus Powered Configuration Example 1............................................................................ 69
Figure 6.2 Bus Powered Configuration Example 2............................................................................ 70
Figure 6.3 Self Powered Configuration Example 1 ........................................................................... 71
Figure 6.4 Self Powered Configuration Example 2 ........................................................................... 72
Figure 6.5 Recommended FT2232H Crystal Oscillator Configuration. ................................................. 73
Figure 8.1 64 pin QFN Package Details .......................................................................................... 76
Figure 8.2 64 pin LQFP Package Details ......................................................................................... 78
Figure 8.3 56-pin VQFN Package Details for FT2232H-56Q ............................................................... 80
Figure 8.4 FT2232H Solder Reflow Profile ....................................................................................... 81
Copyright © Future Technology Devices International Limited 89
FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
Version 2.5
Document No.: FT_000061 Clearance No.: FTDI#77
Appendix C – Revision History
Document Title: FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Document Reference No.: FT_000061
Clearance No.: FTDI#77
Product Page: http://www.ftdichip.com/FTProducts.htm
Document Feedback: Send Feedback
Revision
Changes
Date
1.0
Initial Release
2008-11-04
1.10
QFN Package updated
2008-11-20
2.01
Corrections made to table 3.6, 3.7, table on page 8.
Changed description of WRSTRB# and RDSTRB#
2009-02-01
2.02
Added note that HBE mode only operates at 60MHz
Corrections made to tray QFN 160 changed to 260
Correction made to 3.4.2, falling changed to rising
2009-03-01
2.03
Corrections made to TxLED and RxLED pin
connections
Corrected signals in Figure 4.16.
Corrected signal names in Fig 2.1
Added reference to AN_108, AN_109, AN_110,
AN_111 and AN_113.
2009-05-19
2.04
Added paragraph on latency timer to section 4.1
2009-06-03
2.05
Corrected Figures 6.2, 6.3 an 6.4 – missing
regulators and better way of holding self-powered
designs in reset if not connected to USB.
Corrected Max DC inputs on “DC Input Voltage –
“All Other Inputs” pins from VCORE+0.5V to
VCCIO+0.5V
2009-06-17
2.06
Added explanation of SIWU (4.12)
Added explanation of MPSSE Adaptive clocking
(4.6.1).
Corrected 12MHz crystal specification.
Added # to TXLED, RXLED on table 3.4.
Corrected TX_LED and RX_LED connections on Fig
4.1
2009-09-21
2.07
Edited Table 3.11, references AN2232L-1 to AN_108
Updated and formatted contact information.
2010-03-12
Copyright © Future Technology Devices International Limited 90
FT2232H Dual High Speed USB to Multipurpose UART/FIFO IC
Datasheet
Version 2.5
Document No.: FT_000061 Clearance No.: FTDI#77
2.08
Added TID number (Section 1.3)
Added ESD specifications
2010-05-24
2.09
Corrected ‘WR’ to ‘WR#’ throughout the datasheet
Edited table 4.1 (T8 and T13 Comments)
Edited section 4.7.1 and 4.7.2
Section 4.12, added clarifications about Wake up
Clarified unsupported baud rates of 7,9,10 and 11
Mbaud.
2010-09-02
2.10
Updated section 4.5, FT245 Asynchronous FIFO
Interface timing diagram.
Edited section 4.3.2, 4.3.3, figure 4.2 and 4.3.
2010-11-22
2.11
Edited section 4.7. From Bit A18 to A8
Edited table 3.4 Pin 29 and 30 Description
Added feedback links
2012-03-07
2.20
Updated 245 FIFO Asynchronous Timing Table 4.2,
Figure 4.5 and 4.6
2012-04-09
2.21
Update performance of FT245 Sync FIFO mode
Updated Table 4.1, SIWU# timing updated
2012-06-21
2.22
Added thermal characteristics – new section 5.4
Updated FTDI USA address
Added notes details for QFN package
Added clarification for which signals are 5V tolerant
2013-01-04
2.3
Add information for new package 56-pin VQFN
2016-03-18
2.4
Added section Default EEPROM Configuration
2016-06-03
2.5
Clarified default config is without an EEPROM/balnk
EEPROM
2016-07-07