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 pmod k -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 10k i 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 50k i (max5488) and 100k i 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 _________________________________________________________________ maxim integrated products 1 MAX5487PMB1 peripheral module 19-6326; rev 0; 5/12 ordering information appears at end of data sheet. pmod is a trademark of digilent inc. MAX5487PMB1 peripheral module for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
designation qty description c1 1 0.1 f f q 10%, 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 3 150 i q 5% resistors (0603) u1 1 dual, nonvolatile, 10k i 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 1 ss 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 component list * ep exposed pad. component supplier note: indicate that ou are using the mpm hen contacting this component suppier. 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) MAX5487PMB1 peripheral module
ss mo si sc k vc c gn d 1 2 3 4 5 6 j1 vc c gn d 0. 1u f c1 15 0 r1 15 0 r2 15 0 r3 ha wa la lb lk 4 lk 1 lk 3 lk 2 gn d gn d vd d 1 sc lk 2 di n 3 cs 4 gn d 7 lb 10 wb 11 hb 12 la 13 wa 14 ha 15 ma x5 487 u1 1 2 3 4 5 6 j2 hb wb gn d vc c pi ns 5 an d 6 ar e no co nn ec t pi ns 8 an d 16 ar e in te rn al co nn ec t _________________________________________________________________ maxim integrated products 3 figure 1. MAX5487PMB1 peripheral module schematic MAX5487PMB1 peripheral module
_________________________________________________________________ maxim integrated products 4 figure 2. MAX5487PMB1 peripheral module component placement guidecomponent side figure 3. MAX5487PMB1 peripheral module pcb layoutcomponent side figure 4. MAX5487PMB1 peripheral module pcb layoutinner layer 1 (ground) MAX5487PMB1 peripheral module
_________________________________________________________________ maxim integrated products 5 figure 5. MAX5487PMB1 peripheral module pcb layoutinner layer 2 (power) figure 6. MAX5487PMB1 peripheral module pcb layoutsolder side figure 7. MAX5487PMB1 peripheral module component placement guidesolder side MAX5487PMB1 peripheral module
part type MAX5487PMB1# peripheral module _________________________________________________________________ maxim integrated products 6 ordering information # denotes rohs compliant. MAX5487PMB1 peripheral module
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. revision history MAX5487PMB1 peripheral module
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