19-6326; Rev 0; 5/12
MAX5487PMB1 Peripheral Module
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
Ordering Information
appears at end of data sheet.
MAX5487PMB1 Peripheral Module
Pmod is a trademark of Digilent Inc.
_________________________________________________________________
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
Component List
DESIGNATION
C1
J1
J2
QTY
1
1
1
DESCRIPTION
0.1FF
Q10%,
16V X7R ceramic
capacitor (0603)
Murata GRM188R71C104KA01D
6-pin right-angle male header
6-pin straight male header
—
*EP
= Exposed pad.
1
DESIGNATION
R1, R2, R3
U1
QTY
3
1
DESCRIPTION
150I
Q5%
resistors (0603)
Dual, nonvolatile, 10kI digital
potentiometer (16 TQFN-EP*)
Maxim MAX5487ETE+
PCB: EPCB5487PM1
Component Supplier
SUPPLIER
Murata Electronics North America, Inc.
PHONE
770-436-1300
WEBSITE
www.murata-northamerica.com
Note:
Indicate that you are using the MAX5487PMB1 when contacting this component supplier.
Detailed Description
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.
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.
Table 1. Connector J1 (SPI Communication)
PIN
1
2
3
4
5
6
SIGNAL
SS
MOSI
N.C.
SCK
GND
VCC
DESCRIPTION
Chip enable. Must be asserted low to
enable the SPI interface.
MAX5487 serial-data input
Not connected
MAX5487 serial-clock input
Ground
Power supply
SPI Interface
Table 2. Connector J2 (SPI Communication)
PIN
1
2
3
4
5
6
SIGNAL
HA
WA
LA
HB
WB
LB
DESCRIPTION
High terminal of resistor A
Wiper terminal of resistor A
Low terminal of resistor A
High terminal of resistor B
Wiper terminal of resistor B
Low terminal of resistor B
Software and FPGA Code
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.
_________________________________________________________________
Maxim Integrated Products
2
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