FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Future Technology Devices International Ltd. FT232R USB UART IC Datasheet The FT232R is a USB to serial UART interface with the following advanced features: FIFO receives and transmits buffers for high data throughput. Single chip USB to asynchronous serial data transfer interface. Synchronous and asynchronous bit bang interface options with RD# and WR# strobes. Entire USB protocol handled on the chip. No USB specific firmware programming required. Device supplied pre-programmed with unique USB serial number. Fully integrated 1024 bit EEPROM storing device descriptors and CBUS I/O configuration. Supports bus powered, self-powered and highpower bus powered USB configurations. Fully integrated USB termination resistors. Integrated +3.3V level converter for USB I/O. Fully integrated clock generation with no external crystal required plus optional clock output selection enabling a glue-less interface to external MCU or FPGA. Integrated level converter on UART and CBUS for interfacing to between +1.8V and +5V logic. Data transfer rates from 300 baud to 3 Mbaud (RS422, RS485, RS232) at TTL levels. True 5V/3.3V/2.8V/1.8V CMOS drive output and TTL input. Configurable I/O pin output drive strength. 128 byte receive buffer and 256 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput. Integrated power-on-reset circuit. Fully integrated AVCC supply filtering - no external filtering required. UART signal inversion option. +3.3V (using external oscillator) to +5.25V (internal oscillator) Single Supply Operation. Low operating and USB suspend current. Low USB bandwidth consumption. UHCI/OHCI/EHCI host controller compatible. USB 2.0 Full Speed compatible. -40C to 85C extended operating temperature range. Available in compact Pb-free 28 Pin SSOP and QFN-32 packages (both RoHS compliant). FTDI's royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers eliminate the requirement for USB driver development in most cases. Unique USB FTDIChip-IDTM feature. Configurable CBUS I/O pins. Transmit and receive LED drive signals. UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity 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 Copyright (c) Future Technology Devices International Limited 1 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 1 Typical Applications USB to RS232/RS422/RS485 Converters USB Industrial Control Upgrading Legacy Peripherals to USB USB MP3 Player Interface Cellular and Cordless Phone USB data transfer cables and interfaces USB FLASH Card Reader and Writers Interfacing MCU/PLD/FPGA based designs to USB Set Top Box PC - USB interface USB Digital Camera Interface USB Audio and Low Bandwidth Video data transfer USB Hardware Modems USB Wireless Modems PDA to USB data transfer USB Bar Code Readers USB Smart Card Readers USB Instrumentation USB Software and Hardware Encryption Dongles 1.1 Driver Support Royalty free VIRTUAL COM PORT (VCP) DRIVERS for... Royalty free D2XX Direct Drivers (USB Drivers + DLL S/W Interface) Windows 10 32,64-bit Windows 10 32,64-bit Windows 8/8.1 32,64-bit Windows 8/8.1 32,64-bit Windows 7 32,64-bit Windows 7 32,64-bit Windows Vista and Vista 64-bit Windows Vista and Vista 64-bit Windows XP and XP 64-bit Windows XP and XP 64-bit Windows 98, 98SE, ME, 2000, Server 2003, XP, Server 2008 and server 2012 R2 Windows 98, 98SE, ME, 2000, Server 2003, XP, Server 2008 and server 2012 R2 Windows XP Embedded Windows XP Embedded Windows CE 4.2, 5.0 and 6.0 Windows CE 4.2, 5.0 and 6.0 Mac OS 8/9, OS-X Linux 2.4 and greater Linux 2.4 and greater Android(J2xx) The drivers listed above are all available to download for free from FTDI website (www.ftdichip.com). Various 3rd party drivers are also available for other operating systems - see FTDI website (www.ftdichip.com) for details. For driver installation, please refer to http://www.ftdichip.com/Documents/InstallGuides.htm Copyright (c) Future Technology Devices International Limited 2 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 1.2 Part Numbers Part Number Package FT232RQ-xxxx 32 Pin QFN FT232RL-xxxx 28 Pin SSOP Note: Packing codes for xxxx is: - Reel: Taped and Reel, (SSOP is 2,000pcs per reel, QFN is 6,000pcs per reel). - Tube: Tube packing, 47pcs per tube (SSOP only) - Tray: Tray packing, 490pcs per tray (QFN only) For example: FT232RQ-Reel is 6,000pcs taped and reel packing 1.3 USB Compliant The FT232R is fully compliant with the USB 2.0 specification and has been given the USB-IF Test-ID (TID) 40680004 (Rev B) and 40770018 (Rev C). Copyright (c) Future Technology Devices International Limited 3 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 2 FT232R Block Diagram VCC SLEEP# Baud Rate Generator 48MHz 3V3OUT USBDP USBDM 3.3 Volt LDO Regulator USB Transceiver with Integrated Series Resistors and 1.5K Pullup FIFO RX Buffer Serial Interface Engine ( SIE ) USB Protocol Engine UART Controller with Programmable Signal Inversion UART FIFO Controller DBUS0 DBUS1 DBUS2 DBUS3 DBUS4 DBUS5 DBUS6 DBUS7 CBUS0 CBUS1 CBUS2 CBUS3 Internal EEPROM CBUS4 USB DPLL 3V3OUT FIFO TX Buffer OSCO (optional) OCSI (optional) Internal 12MHz Oscillator x4 Clock Multiplier RESET# 48MHz Reset Generator To USB Transeiver Cell TEST GND Figure 2.1 FT232R Block Diagram For a description of each function please refer to Section 4. Copyright (c) Future Technology Devices International Limited 4 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Table of Contents 1 Typical Applications....................................................... 2 1.1 Driver Support ........................................................................... 2 1.2 Part Numbers ............................................................................. 3 1.3 USB Compliant ........................................................................... 3 2 FT232R Block Diagram .................................................. 4 3 Device Pin Out and Signal Description ........................... 7 3.1 28-LD SSOP Package.................................................................. 7 3.2 SSOP Package Pin Out Description ............................................. 7 3.3 QFN-32 Package ...................................................................... 10 3.4 QFN-32 Package Signal Description ......................................... 10 3.5 CBUS Signal Options ................................................................ 12 4 Function Description ................................................... 14 4.1 Key Features ............................................................................ 14 4.2 Functional Block Descriptions .................................................. 15 5 Devices Characteristics and Ratings ............................ 17 5.1 Absolute Maximum Ratings ...................................................... 17 5.2 DC Characteristics .................................................................... 18 5.3 EEPROM Reliability Characteristics .......................................... 21 5.4 Internal Clock Characteristics .................................................. 21 5.5 Thermal Characteristics ........................................................... 22 6 USB Power Configurations ........................................... 23 6.1 USB Bus Powered Configuration ............................................. 23 6.2 Self Powered Configuration ..................................................... 24 6.3 USB Bus Powered with Power Switching Configuration ........... 25 6.4 USB Bus Powered with Selectable External Logic Supply ......... 26 7 Application Examples .................................................. 28 7.1 USB to RS232 Converter .......................................................... 28 7.2 USB to RS485 Converter .......................................................... 29 7.3 USB to RS422 Converter .......................................................... 30 7.4 USB to MCU UART Interface ..................................................... 31 Copyright (c) Future Technology Devices International Limited 5 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 7.5 LED Interface ........................................................................... 32 7.6 Using the External Oscillator .................................................... 33 8 Internal EEPROM Configuration ................................... 34 9 Package Parameters .................................................... 36 9.1 SSOP-28 Package Dimensions ................................................. 36 9.2 QFN-32 Package Dimensions ................................................... 37 9.3 QFN-32 Package Typical Pad Layout ........................................ 38 9.4 QFN-32 Package Typical Solder Paste Diagram ........................ 38 9.5 Solder Reflow Profile ............................................................... 39 10 Alternative Parts ......................................................... 41 11 Contact Information .................................................... 42 Appendix A - References ................................................... 43 Document References ...................................................................... 43 Acronyms and Abbreviations............................................................ 43 Appendix B - List of Figures and Tables ............................. 44 List of Figures .................................................................................. 44 List of Tables.................................................................................... 44 Appendix C - Revision History ........................................... 46 Copyright (c) Future Technology Devices International Limited 6 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 3 Device Pin Out and Signal Description TXD 1 DTR# RTS# GND NC DSR# DCD# CTS# CBUS4 CBUS2 CBUS3 20 VCCIO TXD VCC RXD 16 USBDM TEST RTS# 15 AGND USBDP CTS# FT232RL NC 8 CBUS0 19 24 CBUS1 27 GND 28 NC DTR# DSR# RESET# NC DCD# OSCI RI# OSCO VCC CBUS0 RESET# CBUS1 17 GND USBDM 3V3OUT A G N D USBDP 25 3V3OUT 15 14 4 OSCO OSCI FTDI RI# 28 YYXX-A RXD FT232RL VCCIO XXXXXXXXXXXX 3.1 28-LD SSOP Package G N D 7 G N D 18 T E S T G N D 21 CBUS2 CBUS3 CBUS4 1 5 3 11 2 9 10 6 23 22 13 14 12 26 Figure 3.1 SSOP Package Pin Out and Schematic Symbol 3.2 SSOP Package Pin Out Description Note: The convention used throughout this document for active low signals is the signal name followed by# Pin No. Name Type Description 15 USBDP I/O USB Data Signal Plus, incorporating internal series resistor and 1.5k pull up resistor to 3.3V. 16 USBDM I/O USB Data Signal Minus, incorporating internal series resistor. Table 3.1 USB Interface Group Pin No. 4 Name VCCIO Type Description PWR +1.8V to +5.25V supply to the UART Interface and CBUS group pins (1...3, 5, 6, 9...14, 22, 23). In USB bus powered designs connect this pin to 3V3OUT pin to drive out at +3.3V levels, or connect to VCC to drive out at 5V CMOS level. This pin can also be supplied with an external +1.8V to +2.8V supply in order to drive outputs at lower levels. It should be noted that in this case this supply should originate from the same source as the supply to VCC. This means that in bus powered designs a regulator which is supplied by the +5V on the USB bus should be used. Copyright (c) Future Technology Devices International Limited 7 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Pin No. Name Type 7, 18, 21 GND PWR Description Device ground supply pins +3.3V output from integrated LDO regulator. This pin should be decoupled to ground using a 100nF capacitor. The main use of this pin is to provide the internal +3.3V supply to the USB transceiver cell and the internal 1.5k pull up resistor on USBDP. Up to 50mA can be drawn from this pin to power external logic if required. This pin can also be used to supply the VCCIO pin. 17 3V3OUT Output 20 VCC PWR +3.3V to +5.25V supply to the device core. (see Note 1) 25 AGND PWR Device analogue ground supply for internal clock multiplier Table 3.2 Power and Ground Group Pin No. Name Type Description 8, 24 NC NC 19 RESET# Input Active low reset pin. This can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up to VCC. 26 TEST Input Puts the device into IC test mode. Must be tied to GND for normal operation, otherwise the device will appear to fail. 27 OSCI Input Input 12MHz Oscillator Cell. Optional - Can be left unconnected for normal operation. (see Note 2) 28 OSCO Output No internal connection Output from 12MHZ Oscillator Cell. Optional - Can be left unconnected for normal operation if internal Oscillator is used. (see Note 2) Table 3.3 Miscellaneous Signal Group Pin No. Name Type Description 1 TXD Output Transmit Asynchronous Data Output. 2 DTR# Output Data Terminal Ready Control Output / Handshake Signal. 3 RTS# Output Request to Send Control Output / Handshake Signal. 5 RXD Input Receiving Asynchronous Data Input. 6 RI# Input Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM taking RI# low (20ms active low pulse) can be used to resume the PC USB host controller from suspend. 9 DSR# Input Data Set Ready Control Input / Handshake Signal. 10 DCD# Input Data Carrier Detect Control Input. 11 CTS# Input Clear To Send Control Input / Handshake Signal. Copyright (c) Future Technology Devices International Limited 8 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Pin No. Name Type Description 12 CBUS4 I/O Configurable CBUS output only Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is SLEEP#. See CBUS Signal Options, Table 3.9. 13 CBUS2 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is TXDEN. See CBUS Signal Options, Table 3.9. 14 CBUS3 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is PWREN#. See CBUS Signal Options, Table 3.9. PWREN# should be used with a 10k resistor pull up. 22 CBUS1 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is RXLED#. See CBUS Signal Options, Table 3.9. 23 CBUS0 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is TXLED#. See CBUS Signal Options, Table 3.9. Table 3.4 UART Interface and CUSB Group (see note 3) Notes: 1. The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) when using the internal clock generator. Operation at +3.3V is possible using an external crystal oscillator. 2. For details on how to use an external crystal, ceramic resonator, or oscillator with the FT232R, please refer Section 7.6 3. When used in Input Mode, the input pins are pulled to VCCIO via internal 200k resistors. These pins can be programmed to gently pull low during USB suspend (PWREN# = "1") by setting an option in the internal EEPROM. Copyright (c) Future Technology Devices International Limited 9 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 3.3 QFN-32 Package 32 25 1 FTDI 1 24 FT232RQ VCC 15 USBDM RTS# 14 USBDP 5 13 NC 25 30 RTS# 29 TXD 28 DTR# NC 27 OSCO OSCI NC TEST 26 31 24 1 VCCIO 27 NC 23 2 RXD 28 CBUS0 22 3 RI# 16 CBUS1 21 4 GND GND 20 5 NC VCC 19 6 DSR# RESET# 18 7 DCD# GND 8 CTS# AGND 17 13 12 11 10 9 NC NC CBUS3 CBUS2 CBUS4 14 USBDM 3V3OUT 15 USBDP 16 DTR# DSR# NC NC 18 23 32 FT232RQ NC 29 25 CTS# NC 12 17 16 9 TXD RXD YYXX-A XXXXXXX 8 VCCIO 19 DCD# RI# RESET# NC CBUS0 OSCI OSCO CBUS1 3V3OUT A G N D 24 4 G N D G N D G N D 17 T E S T 20 CBUS2 CBUS3 CBUS4 30 2 32 8 31 6 7 3 22 21 10 11 9 26 Figure 3.2 QFN-32 Package Pin Out and schematic symbol 3.4 QFN-32 Package Signal Description Pin Name Type 14 USBDP I/O USB Data Signal Plus, incorporating internal series resistor and 1.5k pull up resistor to +3.3V. 15 USBDM I/O USB Data Signal Minus, incorporating internal series resistor. No. Description Table 3.5 USB Interface Group Pin No. Name Type Description 1 VCCIO PWR +1.8V to +5.25V supply for the UART Interface and CBUS group pins (2,3, 6,7,8,9,10,11,21,22,30,31,32). In USB bus powered designs connect this pin to 3V3OUT to drive out at +3.3V levels, or connect to VCC to drive out Copyright (c) Future Technology Devices International Limited 10 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Pin No. Name Type Description at +5V CMOS level. This pin can also be supplied with an external +1.8V to +2.8V supply in order to drive out at lower levels. It should be noted that in this case this supply should originate from the same source as the supply to VCC. This means that in bus powered designs a regulator which is supplied by the +5V on the USB bus should be used. 4, 17, 20 GND PWR Device ground supply pins. +3.3V output from integrated LDO regulator. This pin should be decoupled to ground using a 100nF capacitor. The purpose of this output is to provide the internal +3.3V supply to the USB transceiver cell and the internal 1.5k pull up resistor on USBDP. Up to 50mA can be drawn from this pin to power external logic if required. This pin can also be used to supply the VCCIO pin. 16 3V3OUT Output 19 VCC PWR +3.3V to +5.25V supply to the device core. (See Note 1). 24 AGND PWR Device analogue ground supply for internal clock multiplier. Table 3.6 Power and Ground Group Pin No. Name Type Description 5, 12, 13, 23, 25, 29 NC NC 18 RESET# Input Active low reset. Can be used by an external device to reset the FT232R. If not required can be left unconnected, or pulled up to VCC. 26 TEST Input Puts the device into IC test mode. Must be tied to GND for normal operation, otherwise the device will appear to fail. 27 OSCI Input Input 12MHz Oscillator Cell. Optional - Can be left unconnected for normal operation. (See Note 2). 28 OSCO Output Output from 12MHZ Oscillator Cell. Optional - Can be left unconnected for normal operation if internal Oscillator is used. (See Note 2). No internal connection. Do not connect. Table 3.7 Miscellaneous Signal Group Pin No. Name Type 30 TXD Output Transmit Asynchronous Data Output. 31 DTR# Output Data Terminal Ready Control Output / Handshake Signal. 32 RTS# Output Request to Send Control Output / Handshake Signal. 2 RXD Input Receiving Asynchronous Data Input. 3 RI# Input Ring Indicator Control Input. When remote wake up is enabled in the internal EEPROM taking RI# low (20ms active low pulse) can be used to resume the Description Copyright (c) Future Technology Devices International Limited 11 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Pin No. Name Type Description PC USB host controller from suspend. 6 DSR# Input Data Set Ready Control Input / Handshake Signal. 7 DCD# Input Data Carrier Detect Control Input. 8 CTS# Input Clear To Send Control Input / Handshake Signal. 9 CBUS4 I/O Configurable CBUS output only Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is SLEEP#. See CBUS Signal Options, Table 3.9. 10 CBUS2 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is TXDEN. See CBUS Signal Options, Table 3.9. 11 CBUS3 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is PWREN#. See CBUS Signal Options, Table 3.9. PWREN# should be used with a 10k resistor pull up. 21 CBUS1 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is RXLED#. See CBUS Signal Options, Table 3.9. 22 CBUS0 I/O Configurable CBUS I/O Pin. Function of this pin is configured in the device internal EEPROM. Factory default configuration is TXLED#. See CBUS Signal Options, Table 3.9. Table 3.8 UART Interface and CBUS Group (see note 3) Notes: 1. The minimum operating voltage VCC must be +4.0V (could use VBUS=+5V) when using the internal clock generator. Operation at +3.3V is possible using an external crystal oscillator. 2. For details on how to use an external crystal, ceramic resonator, or oscillator with the FT232R, please refer to Section 7.6. 3. When used in Input Mode, the input pins are pulled to VCCIO via internal 200k resistors. These pins can be programmed to gently pull low during USB suspend (PWREN# = "1") by setting an option in the internal EEPROM. 3.5 CBUS Signal Options The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both package versions of the FT232R. These options can be configured in the internal EEPROM using the software utility FT_PROG, which can be downloaded from the FTDI Utilities (www.ftdichip.com). The default configuration is described in Section 8. CBUS Signal Option Available On CBUS Pin TXDEN CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Enable transmit data for RS485 PWREN# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Output is low after the device has been configured by USB, then high during USB suspending mode. Description Copyright (c) Future Technology Devices International Limited 12 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 CBUS Signal Option Available On CBUS Pin Description This output can be used to control power to external logic P-Channel logic level MOSFET switch. Enable the interface pull-down option when using the PWREN# in this way.* TXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Transmit data LED drive: Data from USB Host to FT232R. Pulses low when transmitting data via USB. See Section 7.5 for more details. RXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Receive data LED drive: Data from FT232R to USB Host. Pulses low when receiving data via USB. See Section 7.5 for more details. TX&RXLED# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 LED drive - pulses low when transmitting or receiving data via USB. See Section 7.5 for more details. SLEEP# CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 Goes low during USB suspend mode. Typically used to power down an external TTL to RS232 level converter IC in USB to RS232 converter designs. CLK48 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 48MHz 0.7% Clock output. ** CLK24 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 24 MHz Clock output. ** CLK12 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 12 MHz Clock output. ** CLK6 CBUS0, CBUS1, CBUS2, CBUS3, CBUS4 6 MHz 0.7% Clock output. ** CBitBangI/O CBUS0, CBUS1, CBUS2, CBUS3 CBUS bit bang mode option. Allows up to 4 of the CBUS pins to be used as general purpose I/O. Configured individually for CBUS0, CBUS1, CBUS2 and CBUS3 in the internal EEPROM. A separate application note, AN232R-01, available from FTDI website (www.ftdichip.com) describes in more detail how to use CBUS bit bang mode. BitBangWRn CBUS0, CBUS1 Synchronous and asynchronous bit bang mode WR# strobe output. BitBangRDn CBUS0, CBUS1, CBUS2, CBUS3 Synchronous and asynchronous bit bang mode RD# strobe output. Table 3.9 CBUS Configuration Control * PWREN# must be used with a 10k resistor pull up. **When in USB suspend mode the outputs clocks are also suspended. Copyright (c) Future Technology Devices International Limited 13 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 4 Function Description The FT232R is a USB to serial external component count by integrated clock circuit which operate efficiently with a USB available. UART interface device which simplifies USB to serial designs and reduces fully integrating an external EEPROM, USB termination resistors and an requires no external crystal, into the device. It has been designed to host controller by using as little as possible of the total USB bandwidth 4.1 Key Features Functional Integration. Fully integrated EEPROM, USB termination resistors, clock generation, AVCC filtering, POR and LDO regulator. Configurable CBUS I/O Pin Options. The fully integrated EEPROM allows configuration of the Control Bus (CBUS) functionality, signal inversion and drive strength selection. There are 5 configurable CBUS I/O pins. These configurable options are 1. 2. 3. 4. 5. 6. 7. TXDEN - transmit enable for RS485 designs. PWREN# - Power control for high power, bus powered designs. TXLED# - for pulsing an LED upon transmission of data. RXLED# - for pulsing an LED upon receiving data. TX&RXLED# - which will pulse an LED upon transmission OR reception of data. SLEEP# - indicates that the device going into USB suspend mode. CLK48 / CLK24 / CLK12 / CLK6 - 48MHz, 24MHz, 12MHz, and 6MHz clock output signal options. 8. BitBangWRn / BitBangRDn - Synchronous and asynchronous bit bang mode WR# / RD# strobe outputs The CBUS pins can also be individually configured as GPIO pins, similar to asynchronous bit bang mode. It is possible to use this mode while the UART interface is being used, thus providing up to 4 general purpose I/O pins which are available during normal operation. An application note, AN232R-01, available from FTDI website (www.ftdichip.com) describes this feature. The CBUS lines can be configured with any one of these output options by setting bits in the internal EEPROM. The device is supplied with the most commonly used pin definitions pre-programmed - see Section 8 for details. Asynchronous Bit Bang Mode with RD# and WR# Strobes. The FT232R supports FTDI's previous chip generation bit-bang mode. In bit-bang mode, the eight UART lines can be switched from the regular interface mode to an 8-bit general purpose I/O port. Data packets can be sent to the device and they will be sequentially sent to the interface at a rate controlled by an internal timer (equivalent to the baud rate pre-scaler). With the FT232R device this mode has been enhanced by outputting the internal RD# and WR# strobes signals which can be used to allow external logic to be clocked by accesses to the bit-bang I/O bus. This option will be described more fully in a separate application note available from FTDI website (www.ftdichip.com). Synchronous Bit Bang Mode. The FT232R supports synchronous bit bang mode. This mode differs from asynchronous bit bang mode in that the interface pins are only read when the device is written to. This makes it easier for the controlling program to measure the response to an output stimulus as the data returned is synchronous to the output data. An application note, AN232R-01, available from FTDI website (www.ftdichip.com) describes this feature. FTDIChip-IDTM. The FT232R also includes the new FTDIChip-IDTM security dongle feature. This FTDIChip-IDTM feature allows a unique number to be burnt into each device during manufacture. This number cannot be reprogrammed. This number is only readable over USB and forms a basis of a security dongle which can be used to protect any customer application software being copied. This allows the possibility of using the FT232R in a dongle for software licensing. Further to this, a renewable license scheme can be implemented based on the FTDIChip-IDTM number when encrypted with other information. This encrypted number can be stored in the user area of the FT232R internal EEPROM, and can be decrypted, then compared with the protected FTDIChip-IDTM to verify that a license is valid. Web based applications can be used to maintain product licensing this way. An application note, AN232R-02, available from FTDI website (www.ftdichip.com) describes this feature. Copyright (c) Future Technology Devices International Limited 14 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 The FT232R is capable of operating at a voltage supply between +3.3V and +5V with a nominal operational mode current of 15mA and a nominal USB suspend mode current of 70A. This allows greater margin for peripheral designs to meet the USB suspend mode current limit of 2.5mA. An integrated level converter within the UART interface allows the FT232R to interface to UART logic running at +1.8V, 2.5V, +3.3V or +5V. 4.2 Functional Block Descriptions The following paragraphs detail each function within the FT232R. Please refer to the block diagram shown in Figure 2.1 Internal EEPROM. The internal EEPROM in the FT232R is used to store USB Vendor ID (VID), Product ID (PID), device serial number, product description string and various other USB configuration descriptors. The internal EEPROM is also used to configure the CBUS pin functions. The FT232R is supplied with the internal EEPROM pre-programmed as described in Section 8. A user area of the internal EEPROM is available to system designers to allow storing additional data. The internal EEPROM descriptors can be programmed in circuit, over USB without any additional voltage requirement. It can be programmed using the FTDI utility software called FT_PROG, which can be downloaded from FTDI Utilities on the FTDI website (www.ftdichip.com). +3.3V LDO Regulator. The +3.3V LDO regulator generates the +3.3V reference voltage for driving the USB transceiver cell output buffers. It requires an external decoupling capacitor to be attached to the 3V3OUT regulator output pin. It also provides +3.3V power to the 1.5k internal pull up resistor on USBDP. The main function of the LDO is to power the USB Transceiver and the Reset Generator Cells rather than to power external logic. However, it can be used to supply external circuitry requiring a +3.3V nominal supply with a maximum current of 50mA. USB Transceiver. The USB Transceiver Cell provides the USB 1.1 / USB 2.0 full-speed physical interface to the USB cable. The output drivers provide +3.3V level slew rate control signalling, whilst a differential input receiver and two single ended input receivers provide USB data in, Single-Ended-0 (SE0) and USB reset detection conditions respectfully. This function also incorporates the internal USB series termination resistors on the USB data lines and a 1.5k pull up resistor on USBDP. USB DPLL. The USB DPLL cell locks on to the incoming NRZI USB data and generates recovered clock and data signals for the Serial Interface Engine (SIE) block. Internal 12MHz Oscillator - The Internal 12MHz Oscillator cell generates a 12MHz reference clock. This provides an input to the x4 Clock Multiplier function. The 12MHz Oscillator is also used as the reference clock for the SIE, USB Protocol Engine and UART FIFO controller blocks. Clock Multiplier / Divider. The Clock Multiplier / Divider takes the 12MHz input from the Internal Oscillator function and generates the 48MHz, 24MHz, 12MHz and 6MHz reference clock signals. The 48Mz clock reference is used by the USB DPLL and the Baud Rate Generator blocks. Serial Interface Engine (SIE). The Serial Interface Engine (SIE) block performs the parallel to serial and serial to parallel conversion of the USB data. In accordance with the USB 2.0 specification, it performs bit stuffing/un-stuffing and CRC5/CRC16 generation. It also checks the CRC on the USB data stream. USB Protocol Engine. The USB Protocol Engine manages the data stream from the device USB control endpoint. It handles the low level USB protocol requests generated by the USB host controller and the commands for controlling the functional parameters of the UART in accordance with the USB 2.0 specification chapter 9. FIFO RX Buffer (128 bytes). Data sent from the USB host controller to the UART via the USB data OUT endpoint is stored in the FIFO RX (receive) buffer. Data is removed from the buffer to the UART transmit register under control of the UART FIFO controller. (Rx relative to the USB interface). FIFO TX Buffer (256 bytes). Data from the UART receive register is stored in the TX buffer. The USB host controller removes data from the FIFO TX Buffer by sending a USB request for data from the device data IN endpoint. (Tx relative to the USB interface). UART FIFO Controller. The UART FIFO controller handles the transfer of data between the FIFO RX and TX buffers and the UART transmit and receive registers. Copyright (c) Future Technology Devices International Limited 15 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 UART Controller with Programmable Signal Inversion and High Drive. Together with the UART FIFO Controller the UART Controller handles the transfer of data between the FIFO RX and FIFO TX buffers and the UART transmit and receive registers. It performs asynchronous 7 or 8 bit parallel to serial and serial to parallel conversion of the data on the RS232 (or RS422 or RS485) interface. Control signals supported by UART mode include RTS, CTS, DSR, DTR, DCD and RI. The UART Controller also provides a transmitter enable control signal pin option (TXDEN) to assist with interfacing to RS485 transceivers. RTS/CTS, DSR/DTR and XON / XOFF handshaking options are also supported. Handshaking is handled in hardware to ensure fast response times. The UART interface also supports the RS232 BREAK setting and detection conditions. Additionally, the UART signals can each be individually inverted and have a configurable high drive strength capability. Both these features are configurable in the EEPROM. Baud Rate Generator - The Baud Rate Generator provides a 16x clock input to the UART Controller from the 48MHz reference clock. It consists of a 14 bit pre-scaler and 3 register bits which provide fine tuning of the baud rate (used to divide by a number plus a fraction or "sub-integer"). This determines the baud rate of the UART, which is programmable from 183 baud to 3 Mbaud. The FT232R supports all standard baud rates and non-standard baud rates from 183 Baud up to 3 Mbaud. Achievable non-standard baud rates are calculated as follows Baud Rate = 3000000 / (n + x) Where `n' can be any integer between 2 and 16,384 ( = 2 14 ) and `x' can be a sub-integer of the value 0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, or 0.875. When n = 1, x = 0, i.e. baud rate divisors with values between 1 and 2 are not possible. This gives achievable baud rates in the range 183.1 baud to 3,000,000 baud. When a non-standard baud rate is required simply pass the required baud rate value to the driver as normal, and the FTDI driver will calculate the required divisor, and set the baud rate. See FTDI application note AN232B-05 on the FTDI website (www.ftdichip.com) for more details. 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 FT232R. RESET# can be tied to VCC or left unconnected if not being used. Copyright (c) Future Technology Devices International Limited 16 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 5 Devices Characteristics and Ratings 5.1 Absolute Maximum Ratings The absolute maximum ratings for the FT232R devices are as follows. These are in accordance with the Absolute Maximum Rating System (IEC 60134). Exceeding these may cause permanent damage to the device. Parameter Value Units Storage Temperature -65 to 150 C 168 Floor Life (Out of Bag) At Factory Ambient (30C / 60% Relative Humidity) (IPC/JEDEC J-STD-033A MSL Level 3 Compliant)* Hours Ambient Temperature (Power Applied) -40 to 85 C MTTF FT232RL 11162037 hours MTTF FT232RQ 4464815 hours VCC Supply Voltage -0.5 to +6.00 V DC Input Voltage - USBDP and USBDM -0.5 to +3.8 V DC Input Voltage - High Impedance Bidirectional -0.5 to + (VCC +0.5) V DC Input Voltage - All Other Inputs -0.5 to + (VCC +0.5) V DC Output Current - Outputs 24 mA DC Output Current - Low Impedance Bidirectional 24 mA Power Dissipation (VCC = 5.25V) 500 mW 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 +125C and baked for up to 17 hours. Copyright (c) Future Technology Devices International Limited 17 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 5.2 DC Characteristics DC Characteristics (Ambient Temperature = -40C to +85C) Parameter Description Minimum Typical Maximum Units Conditions VCC1 VCC Operating Supply Voltage 4.0 --- 5.25 V Using Internal Oscillator VCC1 VCC Operating Supply Voltage 3.3 --- 5.25 V Using External Crystal VCC2 VCCIO Operating Supply Voltage 1.8 --- 5.25 V Icc1 Operating Supply Current --- 15 --- mA Normal Operation Icc2 Operating Supply Current 50 70 100 A USB Suspend 3V3 3.3v regulator output 3.0 3.3 3.6 V Table 5.2 Operating Voltage and Current Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 3.2 4.1 4.9 V I source = 2mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 2mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.3 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.2 2.7 3.2 V I source = 1mA Vol Output Voltage Low 0.3 0.4 0.5 V I sink = 2mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.4 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, Standard Drive Level) Copyright (c) Future Technology Devices International Limited 18 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.1 2.6 2.8 V I source = 1mA Vol Output Voltage Low 0.3 0.4 0.5 V I sink = 2mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.5 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 1.32 1.62 1.8 V I source = 0.2mA Vol Output Voltage Low 0.06 0.1 0.18 V I sink = 0.5mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.6 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, Standard Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 3.2 4.1 4.9 V I source = 6mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 6mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.7 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, High Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.2 2.8 3.2 V I source = 3mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 8mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.8 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, High Drive Level) Copyright (c) Future Technology Devices International Limited 19 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.1 2.6 2.8 V I source = 3mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 8mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.9 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, High Drive Level) Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 1.35 1.67 1.8 V I source = 0.4mA Vol Output Voltage Low 0.12 0.18 0.35 V I sink = 3mA Vin Input Switching Threshold 1.0 1.2 1.5 V ** VHys Input Switching Hysteresis 20 25 30 mV ** Table 5.10 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, High Drive Level) ** Only input pins have an internal 200K pull-up resistor to VCCIO Parameter Description Minimum Typical Maximum Units Vin Input Switching Threshold 1.3 1.6 1.9 V VHys Input Switching Hysteresis 50 55 60 mV Conditions Table 5.11 RESET# and TEST Pin Characteristics Parameter Description Minimum UVoh I/O Pins Static Output (High) UVol Typical Maximum Units Conditions 2.8 3.6 V RI = 1.5k to 3V3OUT (D+) RI = 15K to GND (D-) I/O Pins Static Output (Low) 0 0.3 V RI = 1.5k to 3V3OUT (D+) RI = 15k to GND (D-) UVse Single Ended Rx Threshold 0.8 2.0 V UCom Differential Common Mode 0.8 2.5 V Copyright (c) Future Technology Devices International Limited 20 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 UVDif Differential Input Sensitivity 0.2 UDrvZ Driver Output Impedance 26 V 29 44 Ohms See Note 1 Table 5.12 USB I/O Pin (USBDP, USBDM) Characteristics 5.3 EEPROM Reliability Characteristics The internal 1024 Bit EEPROM has the following reliability characteristics: Parameter Value Units Data Retention 10 Years Write 10,000 Cycles Read Unlimited Cycles Table 5.13 EEPROM Characteristics 5.4 Internal Clock Characteristics The internal Clock Oscillator has the following characteristics: Value Parameter Unit Minimum Typical Maximum Frequency of Operation (see Note 1) 11.98 12.00 12.02 MHz Clock Period 83.19 83.33 83.47 ns Duty Cycle 45 50 55 % Table 5.14 Internal Clock Characteristics Note: Equivalent to +/-1667ppm Parameter Description Minimum Typical Maximum Units Conditions Voh Output Voltage High 2.1 2.8 3.2 V I source = 3mA Vol Output Voltage Low 0.3 0.4 0.6 V I sink = 8mA Vin Input Switching Threshold 1.0 1.2 1.5 V Table 5.15 OSCI, OSCO Pin Characteristics - see Note 1 Note: When supplied, the FT232R is configured to use its internal clock oscillator. These characteristics only apply when an external oscillator or crystal is used. Copyright (c) Future Technology Devices International Limited 21 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 5.5 Thermal Characteristics The FT232RL package has the following thermal characteristics: Parameter Value Units Conditions Theta JA (JA) 55.82 C/W Still air Theta JC (JC) 24.04 C/W Table 5.16 FT232RL Thermal Characteristics The FT232RQ package has the following thermal characteristics: Parameter Value Units Conditions Theta JA (JA) 31.49 C/W Still air, center pad soldered to PCB, 9 vias to another plane Theta JA (JA) 62.31 C/W Still air, center pad unsoldered Theta JC (JC) C/W Table 5.17 FT232RQ Thermal Characteristics Copyright (c) Future Technology Devices International Limited 22 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 6 USB Power Configurations The following sections illustrate possible USB power configurations for the FT232R. The illustrations have omitted pin numbers for ease of understanding since the pins differ between the FT232RL and FT232RQ package options. All USB power configurations illustrated apply to both package options for the FT232R device. Please refer to Section 3 for the package option pin-out and signal descriptions. 6.1 USB Bus Powered Configuration Vcc Ferrite Bead 1 TXD VCC RXD 2 USBDM 3 USBDP RTS# CTS# 4 10nF + VCCIO FT232R DTR# NC 5 DSR# RESET# SHIELD NC DCD# OSCI RI# OSCO GND CBUS0 Vcc CBUS1 100nF 4.7uF + 100nF GND 3V3OUT A G N D G N D G N D G N D T E S T CBUS2 CBUS3 CBUS4 GND GND Figure 6.1 Bus Powered Configuration Figure 6.1 Illustrates the FT232R in a typical USB bus powered design configuration. A USB bus powered device gets its power from the USB bus. Basic rules for USB bus power devices are as follows - i) ii) iii) iv) v) On plug-in to USB, the device should draw no more current than 100mA. In USB Suspend mode the device should draw no more than 2.5mA. A bus powered high power USB device (one that draws more than 100mA) should use one of the CBUS pins configured as PWREN# and use it to keep the current below 100mA on plug-in and 2.5mA on USB suspend. A device that consumes more than 100mA cannot be plugged into a USB bus powered hub. No device can draw more than 500mA from the USB bus. The power descriptors in the internal EEPROM of the FT232R should be programmed to match the current drawn by the device. A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT232R and associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead depends on the total current drawn by the application. A suitable range of Ferrite Beads is available from Steward (www.steward.com), for example Steward Part # MI0805K400R-10. Note: If using PWREN# (available using the CBUS) the pin should be pulled to VCCIO using a 10k resistor. Copyright (c) Future Technology Devices International Limited 23 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 6.2 Self Powered Configuration Figure 6.2 Self-Powered Configuration Figure 6.2 illustrates the FT232R in a typical USB self-powered configuration. A USB self-powered device gets its power from its own power supply, VCC, and does not draw current from the USB bus. The basic rules for USB self-powered devices are as follows - i) ii) iii) A self-powered device should not force current down the USB bus when the USB host or hub controller is powered down. A self-powered device can use as much current as it needs during normal operation and USB suspend as it has its own power supply. A self-powered device can be used with any USB host, a bus powered USB hub or a selfpowered USB hub. The power descriptor in the internal EEPROM of the FT232R should be programmed to a value of zero (self-powered). In order to comply with the first requirement above, the USB bus power (pin 1) is used to control the RESET# pin of the FT232R device. When the USB host or hub is powered up an internal 1.5k resistor on USBDP is pulled up to +3.3V (generated using the 4K7 and 10k resistor network), thus identifying the device as a full speed device to the USB host or hub. When the USB host or hub is powered off, RESET# will be low and the FT232R is held in reset. Since RESET# is low, the internal 1.5k resistor is not pulled up to any power supply (hub or host is powered down), so no current flows down USBDP via the 1.5k pull-up resistor. Failure to do this may cause some USB host or hub controllers to power up erratically. Figure 6.2 illustrates a self-powered design which has a +4V to +5.25V supply. Note: 1. When the FT232R is in reset, the UART interface I/O pins are tri-stated. Input pins have internal 200k pull-up resistors to VCCIO, so they will gently pull high unless driven by some external logic. 2. When using internal FT232R oscillator the VCC supply voltage range must be +4.0V to 5.25V. Copyright (c) Future Technology Devices International Limited 24 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 3. When using external oscillator the VCC supply voltage range must be +3.3V to 5.25V Any design which interfaces to +3.3 V or +1.8V would be having a +3.3V or +1.8V supply to VCCIO. 6.3 USB Bus Powered with Power Switching Configuration P-Channel Power MOSFET s Switched 5V Power To External Logic d g 0.1uF 0.1uF Soft Start Circuit 1K Ferrite Bead 1 5V VCC TXD VCC RXD 2 USBDM RTS# 3 USBDP 4 CTS# 10nF + VCCIO FT232R NC 5 DTR# DSR# RESET# DCD# NC SHIELD 5V VCC RI# OSCI GND CBUS0 OSCO 5V VCC CBUS2 3V3OUT 100nF 10K CBUS1 4.7uF + 100nF A G N D G N D G N D G N D T E S T CBUS3 PWREN# CBUS4 GND GND GND Figure 6.3 Bus Powered with Power Switching Configuration A requirement of USB bus powered applications, is when in USB suspend mode, the application draws a total current of less than 2.5mA. This requirement includes external logic. Some external logic has the ability to power itself down into a low current state by monitoring the PWREN# signal. For external logic that cannot power itself down in this way, the FT232R provides a simple but effective method of turning off power during the USB suspend mode. Figure 6.3 shows an example of using a discrete P-Channel MOSFET to control the power to external logic. A suitable device to do this is an International Rectifier (www.irf.com) IRLML6402, or equivalent. It is recommended that a "soft start" circuit consisting of a 1k series resistor and a 0.1F capacitor is used to limit the current surge when the MOSFET turns on. Without the soft start circuit it is possible that the transient power surge, caused when the MOSFET switches on, will reset the FT232R or the USB host/hub controller. The soft start circuit example shown in Figure 6.3 powers up with a slew rate of approximaely12.5V/ms. Thus supply voltage to external logic transitions from GND to +5V in approximately 400 microseconds. As an alternative to the MOSFET, a dedicated power switch IC with inbuilt "soft-start" can be used. A suitable power switch IC for such an application is the Micrel (www.micrel.com) MIC2025-2BM or equivalent. With power switching controlled designs the following should be noted: i) The external logic to which the power is being switched should have its own reset circuitry to automatically reset the logic when power is re-applied when moving out of suspend mode. ii) Set the Pull-down on Suspend option in the internal FT232R EEPROM. Copyright (c) Future Technology Devices International Limited 25 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 iii) One of the CBUS Pins should be configured as PWREN# in the internal FT232R EEPROM, and used to switch the power supply to the external circuitry. This should be pulled high through a 10 k resistor. iv) For USB high-power bus powered applications (one that consumes greater than 100mA, and up to 500mA of current from the USB bus), the power consumption of the application must be set in the Max Power field in the internal FT232R EEPROM. A high-power bus powered application uses the descriptor in the internal FT232R EEPROM to inform the system of its power requirements. v) PWREN# gets its VCC from VCCIO. For designs using 3V3 logic, ensure VCCIO is not powered down using the external logic. In this case use the +3V3OUT. 6.4 USB Bus Powered with Selectable External Logic Supply 3.3V or 5V Supply to External Logic VCCIO Vcc 100nF Ferrite Bead 1 TXD VCC RXD 2 USBDM 3 USBDP RTS# CTS# 1 4 10nF + 5 2 VCCIO 3 NC NC DCD# OSCI GND RI# OSCO Vcc 100nF DTR# DSR# RESET# Jumper SHIELD FT232R VCCIO CBUS0 4.7uF + CBUS1 3V3OUT A G N D 100nF 10K G N D G N D G N D T E S T CBUS2 PWREN# CBUS3 CBUS4 SLEEP# GND GND GND Figure 6.4 USB Bus Powered with +3.3V or +5V External Logic Power Supply Figure 6.4 illustrates a USB bus power application with selectable external logic supply. The external logic can be selected between +3.3V and +5V using the jumper switch. This jumper is used to allow the FT232R to be interfaced with a +3.3V or +5V logic devices. The VCCIO pin is either supplied with +5V from the USB bus (jumper pins1 and 2 connected), or from the +3.3V output from the FT232R 3V3OUT pin (jumper pins 2 and 3 connected). The supply to VCCIO is also used to supply external logic. With bus powered applications, the following should be noted: i) ii) To comply with the 2.5mA current supply limit during USB suspend mode, PWREN# or SLEEP# signals should be used to power down external logic in this mode. If this is not possible, use the configuration shown in Section 6.3. The maximum current sourced from the USB bus during normal operation should not exceed 100mA, otherwise a bus powered design with power switching (Section 6.3) should be used. Another possible configuration could use a discrete low dropout (LDO) regulator which is supplied by the 5V on the USB bus to supply between +1.8V and +2.8V to the VCCIO pin and to the external logic. In this case VCC would be supplied with the +5V from the USB bus and the VCCIO would be supplied from the output of the LDO regulator. This results in the FT232R I/O pins driving out at between +1.8V and +2.8V logic levels. Copyright (c) Future Technology Devices International Limited 26 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 For a USB bus powered application, it is important to consider the following when selecting the regulator: i) ii) The regulator must be capable of sustaining its output voltage with an input voltage of +4.35V. A Low Drop Out (LDO) regulator should be selected. The quiescent current of the regulator must be low enough to meet the total current requirement of <= 2.5mA during USB suspend mode. A suitable series of LDO regulators that meets these requirements is the MicroChip/Telecom (www.microchip.com) TC55 series of devices. These devices can supply up to 250mA current and have a quiescent current of under 1A. Copyright (c) Future Technology Devices International Limited 27 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 7 Application Examples The following sections illustrate possible applications of the FT232R. The illustrations have omitted pin numbers for ease of understanding since the pins differ between the FT232RL and FT232RQ package options. 7.1 USB to RS232 Converter VCC VCC VCC Ferrite Bead 1 USBDM CTS# CTS# 10nF + VCCIO DTR# DTR# FT232R NC DSR# DSR# RESET# DCD# DCD# NC SHIELD GND OSCO 100nF 4.7uF + 100nF A G N D G N D G N D T E S T CBUS3 CBUS4 DB9M 5 9 4 8 3 7 2 6 1 SHIELD 10 TXLED# GPIO2 CBUS2 G N D DTR DSR RI DTR CTS TXDATA RTS RXDATA DSR DCD RXLED# CBUS1 3V3OUT CTS 270R RI SHDN# CBUS0 VCC 270R DCD RI# RI# OSCI GND RTS RS232 LEVEL CONVERTER USBDP 5 RXDATA RTS# RTS# 3 TXDATA RXD RXD 2 4 TXD TXD VCC GPIO3 SLEEP# GND GND GND Figure 7.1 Application Example showing USB to RS232 Converter An example of using the FT232R as a USB to RS232 converter is illustrated in Figure 7.1. In this application, a TTL to RS232 Level Converter IC is used on the serial UART interface of the FT232R to convert the TTL levels of the FT232R to RS232 levels. This level shift can be done using the popular "213" series of TTL to RS232 level converters. These "213" devices typically have 4 transmitters and 5 receivers in a 28-LD SSOP package and feature an in-built voltage converter to convert the +5V (nominal) VCC to the +/- 9 volts required by RS232. A useful feature of these devices is the SHDN# pin which can be used to power down the device to a low quiescent current during USB suspend mode. A suitable level shifting device is the Sipex SP213EHCA which is capable of RS232 communication at up to 500k baud. If a lower baud rate is acceptable, then several pin compatible alternatives are available such as the Sipex SP213ECA, the Maxim MAX213CAI and the Analogue Devices ADM213E, which are all suitable for communication at up to 115.2k baud. If a higher baud rate is required, the Maxim MAX3245CAI device is capable of RS232 communication rates up to 1Mbaud. Note that the MAX3245 is not pin compatible with the 213 series devices and that the SHDN pin on the MAX device is active high and should be connect to PWREN# pin instead of SLEEP# pin. In example shown, the CBUS0 and CBUS1 have been configured as TXLED# and RXLED# and are being used to drive two LEDs. Copyright (c) Future Technology Devices International Limited 28 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 7.2 USB to RS485 Converter Vcc Vcc RS485 LEVEL CONVERTER GND DB9M 3 7 Ferrite Bead 1 TXD VCC RXD RXD 2 USBDM 4 6 2 RTS# 3 4 TXD USBDP CTS# 10nF + VCCIO NC 5 1 DTR# FT232R 5 DSR# RESET# SHIELD 10 SP481 120R Link DCD# NC SHIELD RI# VCCIO OSCI GND CBUS0 GPIO0 CBUS1 GPIO1 OSCO Vcc 100nF 4.7uF + 100nF A G N D 10K CBUS2 TXDEN 3V3OUT G N D G N D G N D T E S T CBUS3 PWREN# CBUS4 GPO GND GND GND Figure 7.2 Application Example Showing USB to RS485 Converter An example of using the FT232R as a USB to RS485 converter is shown in Figure 7.2. In this application, a TTL to RS485 level converter IC is used on the serial UART interface of the FT232R to convert the TTL levels of the FT232R to RS485 levels. This example uses the Sipex SP481 device. Equivalent devices are available from Maxim and Analogue Devices. The SP481 is a RS485 device in a compact 8 pin SOP package. 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 signal CBUS pin option on the FT232R is provided for exactly this purpose and so the transmitter enable is wired to CBUS2 which has been configured as TXDEN. Similarly, CBUS3 has been configured as PWREN#. This signal is used to control the SP481's receiver enable. The receiver enable is active low, so it is wired to the PWREN# pin to disable the receiver when in USB suspend mode. CBUS2 = TXDEN and CBUS3 = PWREN# are the default device configurations of the FT232R pins. RS485 is a multi-drop network; so many devices can communicate with each other over a two wire cable interface. The RS485 cable requires to be terminated at each end of the cable. A link (which provides the 120 termination) allows the cable to be terminated if the SP481 is physically positioned at either end of the cable. In this example the data transmitted by the FT232R is also present on the receive path of the SP481.This is a common feature of RS485 and requires the application software to remove the transmitted data from the received data stream. With the FT232R it is possible to do this entirely in hardware by modifying the example shown in Figure 7.2 by logically OR'ing the FT232R TXDEN and the SP481 receiver output and connecting the output of the OR gate to the RXD of the FT232R. Note that the TXDEN is activated 1 bit period before the start bit. TXDEN is deactivated at the same time as the stop bit. This is not configurable. Copyright (c) Future Technology Devices International Limited 29 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 7.3 USB to RS422 Converter Vcc Vcc 4 Ferrite Bead 1 4 RTS# 11 2 USBDP 12 CTS# VCCIO FT232R NC 5 DTR# DCD# RXDM GND 7 RI# OSCI GND CBUS0 RS422 LEVEL CONVERTER OSCO CBUS1 Vcc 4.7uF + 100nF A G N D 4 SHIELD CBUS2 3V3OUT 100nF G N D G N D G N D 10 RTSM 5 T CBUS3 E PWREN# S CBUS4T SLEEP# DB9M TXDM TXDP RXDP RXDM RTSM RTSP CTSP CTSM Vcc NC SHIELD 120R SP491 6 DSR# RESET# TXDP RXDP 3 USBDM 10nF + TXDM 9 RXD 3 10 5 TXD VCC 2 RS422 LEVEL CONVERTER 9 RTSP CTSP 3 11 2 12 GND GND Vcc SP491 6 7 120R CTSM GND 10K Figure 7.3 USB to RS422 Converter Configuration An example of using the FT232R as a USB to RS422 converter is shown in Figure 7.3. In this application, two TTL to RS422 Level Converter ICs are used on the serial UART interface of the FT232R to convert the TTL levels of the FT232R to RS422 levels. There are many suitable level converter devices available. This example uses Sipex SP491 devices which have enables on both the transmitter and receiver. Since the SP491 transmitter enable is active high, it is connected to a CBUS pin in SLEEP# configuration. The SP491 receiver enable is active low and is therefore connected to a CBUS pin PWREN# configuration. This ensures that when both the SP491 transmitters and receivers are enabled then the device is active, and when the device is in USB suspend mode, the SP491 transmitters and receivers are disabled. If a similar application is used, but the design is USB BUS powered, it may be necessary to use a P-Channel logic level MOSFET (controlled by PWREN#) in the VCC line of the SP491 devices to ensure that the USB standby current of 2.5mA is met. The SP491 is specified to transmit and receive data at a rate of up to 5 Mbaud. In this example the maximum data rate is limited to 3 Mbaud by the FT232R. Copyright (c) Future Technology Devices International Limited 30 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 7.4 USB to MCU UART Interface Vcc Vcc Ferrite Bead 1 TXD TXD 2 RXD USBDM 3 4 RXD VCC RTS# CTS# CTS# RTS# USBDP 10nF + VCCIO Microcontroller FT232R NC 5 DTR# DSR# RESET# DCD# NC SHIELD RI# OSCI GND CBUS0 OSCO CLK_IN Vcc CBUS1 Vcc 4.7uF + 100nF A G N D 10K CBUS2 3V3OUT 100nF 12MHz OUT G N D G N D G N D T E S T CBUS3 PWREN# I/O CBUS4 GND GND GND Figure 7.4 USB to MCU UART Interface An example of using the FT232R as a USB to Microcontroller (MCU) UART interface is shown in Figure 7.4. In this application the FT232R uses TXD and RXD for transmission and reception of data, and RTS# / CTS# signals for hardware handshaking. Also in this example CBUS0 has been configured as a 12MHz output to clock the MCU. Optionally, RI# could be connected to another I/O pin on the MCU and used to wake up the USB host controller from suspend mode. If the MCU is handling power management functions, then a CBUS pin can be configured as PWREN# and would also be connected to an I/O pin of the MCU. Copyright (c) Future Technology Devices International Limited 31 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 7.5 LED Interface Any of the CBUS I/O pins can be configured to drive an LED. The FT232R has 3 configuration options for driving LEDs from the CBUS. These are TXLED#, RXLED#, and TX&RXLED#. Refer to Section 3.5 for configuration options. VCCIO TX RX 270R 270R FT232R CBUS[0...4] CBUS[0...4] TXLED# RXLED# Figure 7.5 Dual LED Configuration An example of using the FT232R to drive LEDs is shown in Figure 7.5. In this application one of the CBUS pins is used to indicate transmission of data (TXLED#) and another is used to indicate receiving data (RXLED#). When data is being transmitted or received the respective pins will drive from tristate to low in order to provide indication on the LEDs of data transfer. A digital one-shot is used so that even a small percentage of data transfer is visible to the end user. VCCIO LED 270R FT232R CBUS[0...4] TX&RXLED# Figure 7.6 Single LED Configuration Another example of using the FT232R to drive LEDs is shown in Figure 7.6. In this example one of the CBUS pins is used to indicate when data is being transmitted or received by the device (TX&RXLED). In this configuration the FT232R will drive only a single LED. Copyright (c) Future Technology Devices International Limited 32 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 7.6 Using the External Oscillator The FT232R defaults to operating using its own internal oscillator. This requires that the device is powered with VCC(min)=+4.0V. This supply voltage can be taken from the USB VBUS. Applications which require using an external oscillator, VCC= +3.3V, must do so in the following order: 1. When device powered for the very first time, it must have VCC > +4.0V. This supply is available from the USB VBUS supply = +5.0V. 2. The EEPROM must then be programmed to enable external oscillator. This EEPROM modification cannot be done using the FTDI programming utility, FT_PROG. The EEPROM can only be reconfigured from a custom application. Please refer to the following applications note on how to do this: AN_100_Using_The_FT232_245R_With_External_Osc 3. The FT232R can then be powered from VCC=+3.3V and an external oscillator. This can be done using a link to switch the VCC supply. The FT232R will fail to operate when the internal oscillator has been disabled, but no external oscillator has been connected. Copyright (c) Future Technology Devices International Limited 33 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 8 Internal EEPROM Configuration Following a power-on reset or a USB reset the FT232R will scan its internal EEPROM and read the USB configuration descriptors stored there. The default factory programmed values of the internal EEPROM are shown in Table 8.1. Parameter Value Notes USB Vendor ID (VID) 0403h FTDI default VID (hex) USB Product UD (PID) 6001h FTDI default PID (hex) Serial Number Enabled? Yes Serial Number See Note A unique serial number is generated and programmed into the EEPROM during device final test. 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 FT232R USB UART Max Bus Power Current 90mA Power Source Bus Powered Device Type FT232R Returns USB 2.0 device description to the host. Note: The device is a USB 2.0 Full Speed device (12Mb/s) as opposed to a USB 2.0 High Speed device (480Mb/s). USB Version 0200 Remote Wake Up Enabled Taking RI# low will wake up the USB host controller from suspend in approximately 20 ms. High Current I/Os Disabled Enables the high drive level on the UART and CBUS I/O pins. Load VCP Driver Enabled Makes the device load the VCP driver interface for the device. CBUS0 TXLED# Default configuration of CBUS0 - Transmit LED drive. CBUS1 RXLED# Default configuration of CBUS1 - Receive LED drive. CBUS2 TXDEN Default configuration of CBUS2 - Transmit data enable for RS485 Copyright (c) Future Technology Devices International Limited 34 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Parameter Value Notes CBUS3 PWREN# Default configuration of CBUS3 - Power enable. Low after USB enumeration, high during USB suspend mode. CBUS4 SLEEP# Default configuration of CBUS4 - Low during USB suspend mode. Invert TXD Disabled Signal on this pin becomes TXD# if enable. Invert RXD Disabled Signal on this pin becomes RXD# if enable. Invert RTS# Disabled Signal on this pin becomes RTS if enable. Invert CTS# Disabled Signal on this pin becomes CTS if enable. Invert DTR# Disabled Signal on this pin becomes DTR if enable. Invert DSR# Disabled Signal on this pin becomes DSR if enable. Invert DCD# Disabled Signal on this pin becomes DCD if enable. Invert RI# Disabled Signal on this pin becomes RI if enable. Table 8.1 Default Internal EEPROM Configuration The internal EEPROM in the FT232R can be programmed over USB using the FTDI utility program FT_PROG. FT_PROG can be downloaded from FTDI Utilities on the FTDI website (www.ftdichip.com). Version 2.8a or later is required for the FT232R chip. 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. Contact FTDI support for this service. Copyright (c) Future Technology Devices International Limited 35 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 9 Package Parameters The FT232R is available in two different packages. The FT232RL is the SSOP-28 option and the FT232RQ is the QFN-32 package option. The solder reflow profile for both packages is described in Section 9.5. 9.1 SSOP-28 Package Dimensions 7.80 +/-0.40 5.30 +/-0.30 12 Typ 10.20 +/-0.30 14 2.00 Max 0.05 Min FTDI FT232RL 0.65 +/-0.026 YYXX-A XXXXXXXXXXXX 1.02 Typ. 0.30 +/-0.012 1.75 +/- 0.10 28 1 1.25 +/-0.12 0.09 0.25 0 - 8 0.75 +/-0.20 15 Figure 9.1 SSOP-28 Package Dimensions The FT232RL is supplied in a RoHS compliant 28 pin SSOP package. The package is lead (Pb) free and uses a `green' compound. The package is fully compliant with European Union directive 2002/95/EC. This package is nominally 5.30mm x 10.20mm body (7.80mm x 10.20mm including pins). The pins are on a 0.65 mm pitch. The above mechanical drawing shows the SSOP-28 package. All dimensions are in millimetres. The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. This is followed by the revision number. The code XXXXXXXXXXXX is the manufacturing LOT code. This only applies to devices manufactured after April 2009. Copyright (c) Future Technology Devices International Limited 36 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 9.2 QFN-32 Package Dimensions 32 Indicates Pin #1 (Laser Marked) FTDI 24 5.000 +/-0.075 1 25 YYXX-A XXXXXXX 8 FT232RQ 9 17 16 5.000 +/-0.075 9 0.500 0.250 +/-0.050 10 11 12 13 14 15 16 0.150 Max 8 17 7 18 6 19 5 20 4 21 3 22 2 23 1 24 Pin #1 ID 32 31 30 29 28 27 26 3.200 +/-0.100 Central Heat Sink Area 0.200 Min 25 3.200 +/-0.100 0.500 +/-0.050 0.900 +/ -0.100 0.200 0.050 Note: The pin #1 ID is connected internally to the device's central heat sink area . It is recommended to ground the central heat sink area of the device. Dimensions in mm. Figure 9.2 QFN-32 Package Dimensions The FT232RQ is supplied in a RoHS compliant leadless QFN-32 package. The package is lead ( Pb ) free, and uses a `green' compound. The package is fully compliant with European Union directive 2002/95/EC. This package is nominally 5.00mm x 5.00mm. The solder pads are on a 0.50mm pitch. The above mechanical drawing shows the QFN-32 package. All dimensions are in millimetres. The centre pad on the base of the FT232RQ is not internally connected, and can be left unconnected, or connected to ground (recommended). The date code format is YYXX where XX = 2 digit week number, YY = 2 digit year number. The code XXXXXXX is the manufacturing LOT code. This only applies to devices manufactured after April 2009. Copyright (c) Future Technology Devices International Limited 37 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 9.3 QFN-32 Package Typical Pad Layout 2.50 25 0.150 Max 1 0.500 3.200 +/-0.100 0.30 Optional GND Connection 3.200 +/-0.100 Optional GND Connection 0.20 2.50 17 0.200 Min 0.100 9 0.500 +/-0.050 Figure 9.3 Typical Pad Layout for QFN-32 Package 9.4 QFN-32 Package Typical Solder Paste Diagram 2.5 +/- 0.0375 2.5 +/- 0.0375 Figure 9.4 Typical Solder Paste Diagram for QFN-32 Package Copyright (c) Future Technology Devices International Limited 38 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 9.5 Solder Reflow Profile The FT232R is supplied in Pb free 28 LD SSOP and QFN-32 packages. The recommended solder reflow profile for both package options is shown in Figure 9.5. Temperature, T (Degrees C) tp Tp Critical Zone: when T is in the range TL to Tp Ramp Up TL tL TS Max Ramp Down TS Min tS Preheat 25 T = 25 C to TP Time, t (seconds) Figure 9.5 FT232R Solder Reflow Profile The recommended values for the solder reflow profile are detailed in Table 9.1. Values are shown for both a completely Pb free solder process (i.e. the FT232R is used with Pb free solder), and for a non-Pb free solder process (i.e. the FT232R is used with non-Pb free solder). Profile Feature Average Ramp Up Rate (Ts to Tp) Pb Free Solder Process Non-Pb Free Solder Process 3C / second Max. 3C / Second Max. - Temperature Min (Ts Min.) 150C 100C - Temperature Max (Ts Max.) 200C 150C - Time (ts Min to ts Max) 60 to 120 seconds 60 to 120 seconds 217C 183C 60 to 150 seconds 60 to 150 seconds 260C 240C 20 to 40 seconds 20 to 40 seconds Preheat Time Maintained Above Critical Temperature TL: - Temperature (TL) - Time (tL) Peak Temperature (Tp) Time within 5C of actual Peak Temperature (tp) Copyright (c) Future Technology Devices International Limited 39 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Ramp Down Rate Time for T= 25C to Peak Temperature, Tp 6C / second Max. 6C / second Max. 8 minutes Max. 6 minutes Max. Table 9.1 Reflow Profile Parameter Values Copyright (c) Future Technology Devices International Limited 40 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 10 Alternative Parts The following lists of parts are not all direct drop in replacements but offer similar features as an alternative to the FT232R. The FT-X series is the latest device family offering reduced power and pin count with additional features such as battery charge detection, while the Hi-Speed solution offers faster interfacing. FT232R FT234XD FT230X FT231X FT232H Description Single channel USB to UART with full modem control lines Single channel USB to Basic UART Single channel USB to Basic UART Single channel USB to UART with full modem control lines Single channel USB to UART with full modem control lines USB Speed USB 2.0 full speed USB 2.0 full speed USB 2.0 full speed USB 2.0 full speed USB 2.0 hispeed UART Data Rates 3 MBaud 3 MBaud 3 MBaud 3 MBaud 12 MBaud CBUS 5 1 4 4 10 MTP for storing descriptors Internal Internal Internal Internal External 16 pin QFN 20 pin QFN 48 pin QFN 16 pin SSOP 20 pin SSOP 48 pin LQFP FT230X FT231X FT232H Package options Datasheet 32 pin QFN 28 pin SSOP FT232R 12 pin DFN (3mm x 3mm) FT234XD Table 10.1 FT232R alternative solutions Copyright (c) Future Technology Devices International Limited 41 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 11 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) E-mail (Support) E-mail (General Enquiries) Web Shop URL sales1@ftdichip.com support1@ftdichip.com admin1@ftdichip.com http://www.ftdichip.com Branch Office - Taipei, Taiwan E-Mail (Sales) E-Mail (Support) E-Mail (General Enquiries) us.sales@ftdichip.com us.support@ftdichip.com us.admin@ftdichip.com 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 (Support) tw.support1@ftdichip.com E-mail (General Enquiries) tw.admin1@ftdichip.com E-Mail (Sales) cn.sales@ftdichip.com E-Mail (Support) cn.support@ftdichip.com E-Mail (General Enquiries) cn.admin1@ftdichip.com Web Site http://www.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. Neith er 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, Un it 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC136640 Copyright (c) Future Technology Devices International Limited 42 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Appendix A - References Document References AN_232R-01 Bit Bang Mode Available for FT232R and FT245R AN_107-Advanced Driver Options AN232R-02 FTDIChip-ID for the FT232R and FT245R AN_121- Accessing the EEPROM User Area of FTDI Devices AN_120 Aliasing VCP Baud Rates AN_100 - Using the FT232R/FT245R with an External Crystal or Oscillator AN_126 - User Guide for FT232B/R Factory Test Utility AN232B-05 Configuring FT232R, FT2232 and FT232B Baud Rates http://www.ftdichip.com/Documents/InstallGuides.htm FT_PROG Acronyms and Abbreviations Terms EEPROM FPGA Description Electrically Erasable Programmable Read-Only Memory Field Programmable Gate Array LED Light Emitting Diode MCU Micro Controller Unit PLD Programmable Logic Device QFN Quad Flat No-leads RoHS SIE UART Restriction of Hazardous Substances Directive Serial Interface Engine Universal Asynchronous Receiver/Transmitter USB Universal Serial Bus VCP Virtual Communication Port Copyright (c) Future Technology Devices International Limited 43 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Appendix B - List of Figures and Tables List of Figures Figure 2.1 FT232R Block Diagram ................................................................................................... 4 Figure 3.1 SSOP Package Pin Out and Schematic Symbol ................................................................... 7 Figure 3.2 QFN-32 Package Pin Out and schematic symbol .............................................................. 10 Figure 6.1 Bus Powered Configuration ........................................................................................... 23 Figure 6.2 Self Powered Configuration ........................................................................................... 24 Figure 6.3 Bus Powered with Power Switching Configuration ............................................................ 25 Figure 6.4 USB Bus Powered with +3.3V or +5V External Logic Power Supply .................................... 26 Figure 7.1 Application Example showing USB to RS232 Converter ..................................................... 28 Figure 7.2 Application Example Showing USB to RS485 Converter .................................................... 29 Figure 7.3 USB to RS422 Converter Configuration ........................................................................... 30 Figure 7.4 USB to MCU UART Interface .......................................................................................... 31 Figure 7.5 Dual LED Configuration ................................................................................................ 32 Figure 7.6 Single LED Configuration .............................................................................................. 32 Figure 9.1 SSOP-28 Package Dimensions ....................................................................................... 36 Figure 9.2 QFN-32 Package Dimensions ......................................................................................... 37 Figure 9.3 Typical Pad Layout for QFN-32 Package .......................................................................... 38 Figure 9.4 Typical Solder Paste Diagram for QFN-32 Package ........................................................... 38 Figure 9.5 FT232R Solder Reflow Profile ........................................................................................ 39 List of Tables Table 3.1 USB Interface Group ....................................................................................................... 7 Table 3.2 Power and Ground Group ................................................................................................. 8 Table 3.3 Miscellaneous Signal Group .............................................................................................. 8 Table 3.4 UART Interface and CUSB Group (see note 3) .................................................................... 9 Table 3.5 USB Interface Group ..................................................................................................... 10 Table 3.6 Power and Ground Group ............................................................................................... 11 Table 3.7 Miscellaneous Signal Group ............................................................................................ 11 Table 3.8 UART Interface and CBUS Group (see note 3) .................................................................. 12 Table 3.9 CBUS Configuration Control ........................................................................................... 13 Table 5.1 Absolute Maximum Ratings ............................................................................................ 17 Table 5.2 Operating Voltage and Current ....................................................................................... 18 Table 5.3 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, Standard Drive Level) .................. 18 Table 5.4 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, Standard Drive Level) .................. 18 Table 5.5 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, Standard Drive Level) .................. 19 Table 5.6 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, Standard Drive Level) .................. 19 Copyright (c) Future Technology Devices International Limited 44 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Table 5.7 UART and CBUS I/O Pin Characteristics (VCCIO = +5.0V, High Drive Level) ......................... 19 Table 5.8 UART and CBUS I/O Pin Characteristics (VCCIO = +3.3V, High Drive Level) ......................... 19 Table 5.9 UART and CBUS I/O Pin Characteristics (VCCIO = +2.8V, High Drive Level) ......................... 20 Table 5.10 UART and CBUS I/O Pin Characteristics (VCCIO = +1.8V, High Drive Level) ....................... 20 Table 5.11 RESET# and TEST Pin Characteristics ............................................................................ 20 Table 5.12 USB I/O Pin (USBDP, USBDM) Characteristics ................................................................. 21 Table 5.13 EEPROM Characteristics ............................................................................................... 21 Table 5.14 Internal Clock Characteristics ....................................................................................... 21 Table 5.15 OSCI, OSCO Pin Characteristics - see Note 1 ................................................................. 21 Table 5.16 FT232RL Thermal Characteristics .................................................................................. 22 Table 5.17 FT232RQ Thermal Characteristics.................................................................................. 22 Table 8.1 Default Internal EEPROM Configuration............................................................................ 35 Table 9.1 Reflow Profile Parameter Values ..................................................................................... 40 Table 10.1 FT232R alternative solutions ........................................................................................ 41 Copyright (c) Future Technology Devices International Limited 45 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Appendix C - Revision History Document Title: FT232R USB UART IC Datasheet Document Reference No.: FT_000053 Clearance No.: FTDI# 38 Product Page: http://www.ftdichip.com/FTProducts.htm Document Feedback: Send Feedback Revision Changes Date Version 0.90 Initial Release August 2005 Version 0.96 Revised Pre-release datasheet October 2005 Version 1.00 Full Datasheet Release December 2005 Version 1.02 Minor revisions to datasheet December 2005 Version 1.03 Manufacturer ID added to default EEPROM configuration; Buffer sizes added January 2006 QFN-32 Pad layout and solder paste diagrams added January 2006 Version 1.04 Reformatted, updated package info, added notes for 3.3V operation; Version 2.00 Part numbers, TID; added UART and CBUS characteristics for +1.8V; June 2008 Corrected RESET#; Added MTTF data; Corrected the input switching threshold and input hysteresis values for VCCIO=5V Corrected pin-out number in table3.2 for GND pin18. Improved graphics on some Figures. Version 2.01 Add packing details. Changed USB suspend current spec from 500uA to 2.5mA August 2008 Corrected Figure 9.2 QFN dimensions. Corrected Tape and Reel quantities. Added comment "PWREN# should be used with a 10k resistor pull up". Replaced TXDEN# with TXDEN since it is active high in various places. Version 2.02 Added lot number to the device markings. April 2009 Added 3V3 regulator output tolerance. Clarified VCC operation and added section headed "Using an external Oscillator" Updated company contact information. Copyright (c) Future Technology Devices International Limited 46 FT232R USB UART IC Datasheet Version 2.14 Document No.: FT_000053 Clearance No.: FTDI# 38 Revision Changes Date Version 2.03 Corrected the RX/TX buffer definitions to be relative to the USB interface June 2009 Version 2.04 Additional dimensions added to QFN solder profile June 2009 Version 2.05 Modified package dimensions to 5.0 x 5.0 +/0.075mm and Solder paste diagram to 2.50 x 2.50 +/-0.0375mm Added Windows 7 32, 64 bit driver support Added FT_PROG utility references Added Appendix A-references. Figure 2.1 updated. Updated USB-IF TID for Rev B December 2009 Version 2.06 Updated section 6.2, Figure 6.2 and the note, Updated section 5.3, Table 5.13, EEPROM data retention time May 2010 Version 2.07 Added USB Certification Logos July 2010 Version 2.08 Updated USB-IF TID for Rev C April 2011 Version 2.09 Corrected Rev C TID number April 2011 Table 3.9, added clock output frequency within 0.7% Version 2.10 Edited Table 3.9, TXLED# and TXLED# Description March 2012 Added feedback links Added thermal characteristics (Section 5.5) Version 2.11 Version 2.12 Added section 10 highlighting alternative solutions from FTDI Updated the links under section A - References - Useful Application Notes April 2015 August 2015 Updated list of OS with supported drivers Version 2.13 Update Typo error in section heading 7.2 USB to RS485 Converter 2015-11-18 Version 2.14 Changes made to Bitbang WRn CBUS signal availability in Table 3.9. 2018-06-27 Copyright (c) Future Technology Devices International Limited 47