19-6326; Rev 0; 5/12 MAX5487PMB1 Peripheral Module General Description Features The MAX5487PMB1 peripheral module provides the necessary hardware to interface the MAX5487 dual lineartaper 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 SPIcompatible 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. S Dual, 256-Tap, Linear-Taper 10kI Digital Potentiometers Refer to the MAX5487/MAX5488/MAX5489 IC data sheet for detailed information regarding operation of the IC. S 6-Pin Pmod-Compatible Connector (SPI) 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 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 QTY 1 DESCRIPTION DESIGNATION QTY 0.1FF Q10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C104KA01D R1, R2, R3 3 150I Q5% resistors (0603) U1 1 Dual, nonvolatile, 10kI digital potentiometer (16 TQFN-EP*) Maxim MAX5487ETE+ — 1 PCB: EPCB5487PM1 J1 1 6-pin right-angle male header J2 1 6-pin straight male header DESCRIPTION *EP = Exposed pad. Component Supplier SUPPLIER Murata Electronics North America, Inc. PHONE WEBSITE 770-436-1300 www.murata-northamerica.com Note: Indicate that you are using the MAX5487PMB1 when contacting this component supplier. Detailed Description SPI Interface Table 1. Connector J1 (SPI Communication) PIN SIGNAL DESCRIPTION Chip enable. Must be asserted low to enable the 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. 1 SS 2 MOSI MAX5487 serial-data input 3 N.C. Not connected 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. 4 SCK MAX5487 serial-clock input 5 GND Ground 6 VCC Power supply 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 development boards that support an integrated or synthesized 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 evaluation and design. These include a base application (maximModules.c) that demonstrates module functionality and uses an API interface (maximDeviceSpecific Utilities.c) to set and access Maxim device functions within a specific module. Table 2. Connector J2 (SPI Communication) PIN SIGNAL 1 HA High terminal of resistor A DESCRIPTION 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 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 J1 1 2 3 4 5 6 150 R3 GND VCC 150 150 R1 R2 SCK SS MOSI GND VCC HB WB LB DIN CS LA WA HA MAX5487 GND 0.1uF SCLK GND VDD C1 10 11 12 13 14 15 Pins 5 and 6 are No Connect Pins 8 and 16 are Internal Connect 4 3 2 7 1 U1 VCC GND LK3 LK4 GND LK1 LK2 LB WB HB LA WA HA J2 1 2 3 4 5 6 MAX5487PMB1 Peripheral Module Figure 1. MAX5487PMB1 Peripheral Module Schematic __________________________________________________________________ Maxim Integrated Products 3 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 4 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 __________________________________________________________________ Maxim Integrated Products 5 MAX5487PMB1 Peripheral Module Ordering Information PART TYPE MAX5487PMB1# Peripheral Module #Denotes RoHS compliant. __________________________________________________________________ Maxim Integrated Products 6 MAX5487PMB1 Peripheral Module Revision History REVISION NUMBER REVISION DATE 0 5/12 DESCRIPTION Initial release PAGES CHANGED — 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 © 2012 Maxim Integrated Products 7 Maxim is a registered trademark of Maxim Integrated Products, Inc.