General Description
The MAX5487PMB1 peripheral module provides the nec-
essary hardware to interface the MAX5487 dual linear-
taper digital potentiometer to any system that utilizes
PmodK-compatible expansion ports configurable for SPI
communication. These digital potentiometers function
like mechanical potentiometers with a simple 3-wire SPI-
compatible interface that programs the wipers to any one
of 256 tap positions. The terminals of each potentiometer
are available at the output connector for attachment to
external circuitry.
Refer to the MAX5487/MAX5488/MAX5489 IC data sheet
for detailed information regarding operation of the IC.
Features
S Dual, 256-Tap, Linear-Taper 10kI Digital
Potentiometers
S Wiper Position Stored in Nonvolatile Memory
(EEPROM) and Recalled on Power-Up or by an
Interface Command
S IC is Pin-Compatible with 50kI (MAX5488) and
100kI Versions (MAX5489)
S Solder Links Allowing Configuration as Variable
Resistors
S 6-Pin Pmod-Compatible Connector (SPI)
S Example Software Written in C for Portability
S RoHS Compliant
S Proven PCB Layout
S Fully Assembled and Tested
MAX5487PMB1 Peripheral Module
_________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX5487PMB1 Peripheral Module
19-6326; Rev 0; 5/12
Ordering Information appears at end of data sheet.
Pmod is a trademark of Digilent Inc.
DESIGNATION QTY DESCRIPTION
C1 1
0.1FF Q10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C104KA01D
J1 1 6-pin right-angle male header
J2 1 6-pin straight male header
DESIGNATION QTY DESCRIPTION
R1, R2, R3 3 150I Q5% resistors (0603)
U1 1
Dual, nonvolatile, 10kI digital
potentiometer (16 TQFN-EP*)
Maxim MAX5487ETE+
— 1 PCB: EPCB5487PM1
SUPPLIER PHONE WEBSITE
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
PIN SIGNAL DESCRIPTION
1SS Chip enable. Must be asserted low to
enable the SPI interface.
2 MOSI MAX5487 serial-data input
3 N.C. Not connected
4 SCK MAX5487 serial-clock input
5 GND Ground
6 VCC Power supply
PIN SIGNAL DESCRIPTION
1 HA High terminal of resistor A
2 WA Wiper terminal of resistor A
3 LA Low terminal of resistor A
4 HB High terminal of resistor B
5 WB Wiper terminal of resistor B
6 LB Low terminal of resistor B
_________________________________________________________________ Maxim Integrated Products 2
MAX5487PMB1 Peripheral Module
Component List
*EP = Exposed pad.
Component Supplier
Note: Indicate that you are using the MAX5487PMB1 when contacting this component supplier.
Detailed Description
SPI Interface
The MAX5487PMB1 peripheral module can plug directly
into a Pmod-compatible port (configured for SPI) through
connector J1. For information on the SPI protocol, refer to
the MAX5487/MAX5488/MAX5489 IC data sheet.
J1 provides connection of the module to the Pmod
host. The pin functions and pin assignments adhere to
the Pmod standard recommended by Digilent Inc. See
Table 1.
Connector J2 provides connection to the potentiometers.
See Table 2.
Software and FPGA Code
Example software and drivers are available that execute
directly without modification on several FPGA devel-
opment boards that support an integrated or synthe-
sized microprocessor. These boards include the Digilent
Nexys 3, Avnet LX9, and Avnet ZEDBoard, although
other platforms can be added over time. Maxim provides
complete Xilinx ISE projects containing HDL, Platform
Studio, and SDK projects. In addition, a synthesized bit
stream, ready for FPGA download, is provided for the
demonstration application.
The software project (for the SDK) contains several
source files intended to accelerate customer evalu-
ation and design. These include a base application
(maximModules.c) that demonstrates module function-
ality and uses an API interface (maximDeviceSpecific
Utilities.c) to set and access Maxim device functions
within a specific module.
The source code is written in standard ANSI C format, and
all API documentation including theory/operation, register
description, and function prototypes are documented in
the API interface file (maximDeviceSpecificUtilities.h & .c).
The complete software kit is available for download at
www.maxim-ic.com. Quick start instructions are also
available as a separate document.
Table 1. Connector J1 (SPI Communication)
Table 2. Connector J2 (SPI Communication)
SS
MOSI
SCK
VCC
GN D
1
2
3
4
5
6
J1
VCCGN D
0. 1uFC1
15 0R1
15 0R2
15 0R3
HA
WA
LA
LB
LK 4
LK 1
LK 3
LK 2
GN D
GN D
VD D
1
SCLK
2
DIN
3
CS
4
GN D
7
LB 10
WB 11
HB 12
LA 13
WA 14
HA 15
MAX5 487U1
1
2
3
4
5
6
J2
HB
WB
GN D
VCC
Pins 5 an d 6 are No Conn ect
Pins 8 an d 16 are In tern al Conn ec t
_________________________________________________________________ Maxim Integrated Products 3
MAX5487PMB1 Peripheral Module
Figure 1. MAX5487PMB1 Peripheral Module Schematic
_________________________________________________________________ Maxim Integrated Products 4
MAX5487PMB1 Peripheral Module
Figure 2. MAX5487PMB1 Peripheral Module Component Placement Guide—Component Side
Figure 3. MAX5487PMB1 Peripheral Module PCB Layout—Component Side
Figure 4. MAX5487PMB1 Peripheral Module PCB Layout—Inner Layer 1 (Ground)
_________________________________________________________________ Maxim Integrated Products 5
MAX5487PMB1 Peripheral Module
Figure 5. MAX5487PMB1 Peripheral Module PCB Layout—Inner Layer 2 (Power)
Figure 6. MAX5487PMB1 Peripheral Module PCB Layout—Solder Side
Figure 7. MAX5487PMB1 Peripheral Module Component Placement Guide—Solder Side
PART TYPE
MAX5487PMB1# Peripheral Module
_________________________________________________________________ Maxim Integrated Products 6
MAX5487PMB1 Peripheral Module
Ordering Information
#Denotes RoHS compliant.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 5/12 Initial release —
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 7
© 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX5487PMB1 Peripheral Module
Revision History
