general description the MAX31723PMB1 peripheral module provides the necessary hardware to interface the max31723 digital thermometer and thermostat to any system that utilizes pmod k -compatible expansion ports configurable for spi and/or gpio communication. the ic provides tempera - ture-to-digital conversion with no additional components. temperature readings are communicated from the device over an spi interface or a 3-wire serial interface. the choice of interface is selectable by the user. for appli - cations that require greater temperature resolution, the user can adjust the readout resolution from 9 bits to 12 bits. this is particularly useful in applications where ther - mal runaway conditions must be detected quickly. the thermostat has a dedicated open-drain output ( tout ). two thermostat operating modes (comparator and inter - rupt) control thermostat operation based on user-defined nonvolatile trip points (t high and t low ). refer to the max31723 ic data sheet for detailed informa - tion regarding operation of the ic. features s measures temperatures from -55 n c to +125 n c s thermometer accuracy is q 0.5 n c s thermometer resolution is configurable from 9 bits to 12 bits s thermostat output with user-defined nonvolatile thresholds s spi or 3-wire interface selectable through jumpers s 6-pin pmod-compatible connector (spi/gpio) s example software written in c for portability s rohs compliant s proven pcb layout s fully assembled and tested _________________________________________________________________ maxim integrated products 1 MAX31723PMB1 peripheral module 19-6332; rev 0; 5/12 ordering information appears at end of data sheet. pmod is a trademark of digilent inc. MAX31723PMB1 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 c2 1 1 f f q 10%, 10v x7r ceramic capacitor (0603) tdk c1608x7r1a105k j1 1 6-pin right-angle male header jp1 1 10-pin (2 x 5) straight male header designation qty description r1Cr4 4 150 i q 5% resistors (0603) r5 1 4.7k i q 5% resistor (0603) r6 1 10k i q 5% resistor (0603) u1 1 digital thermometer and thermostat (8 f max m ) maxim max31723mua+ 3 shorting jumpers 1 pcb: epcb31723pm1 supplier phone website murata electronics north america, inc. 770-436-1300 www.murata-northamerica.com tdk corp. 847-803-6100 www.component.tdk.com pin signal description 1 ss chip enable. must be asserted high for communication to take place for either the spi or 3-wire interface. 2 mosi when spi communication is selected, this pin is the serial-data input for the ic. when 3-wire communication is selected, this pin carries bidirectional data between the host and the ic. 3 miso when spi communication is selected, this pin is the serial-data output for the ic. when 3-wire communication is selected, this pin carries the ic tout signal. 4 sck serial clock. used to synchronize data movement on the serial interface for either the spi or 3-wire interface. 5 gnd ground 6 vcc power supply _________________________________________________________________ maxim integrated products 2 component list component suppliers note: indicate that you are using the MAX31723PMB1 when contacting these component suppliers max is a registered trademark of maxim integrated products, inc. detailed description spi/3-wire interface the MAX31723PMB1 peripheral module can plug directly into a pmod-compatible port (configured for spi/3-wire) through connector j1. for information on spi and 3-wire protocols, refer to the max31723 ic data sheet. the user selects between spi and 3-wire communication protocols by setting the correct jumper configuration on jp2. see figure 1 for proper jumper settings. connector j1 provides connection of the module to the pmod host. the pin functions and pin assignments adhere to the pmod standard recommended by digilent. note that when this module is operating in 3-wire mode, the host- side interface must be configured as gpio to allow for bit- banged communication. 3-wire mode has the advantage of freeing up an interface pin on the ic to allow for connec - tion to the thermostat/alarm output. see table 1. the jp1 jumper block is used to configure the communi - cation mode with the host board. the peripheral module can communicate in either spi or 3-wire mode. the cor - rect shunt settings are shown in table 2 and figure 1. table 1. connector j1 (spi/3-wire communication) MAX31723PMB1 peripheral module
shunt spi mode 3-wire mode 1 3-5 1-2 2 4-6 3-5 3 9-10 4-6 3-wire mode spi mode _________________________________________________________________ maxim integrated products 3 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 2. connector jp1 (serial-bus type selection) figure 1. jp1 jumper settings MAX31723PMB1 peripheral module
vc c gn d to ut 1 ce 2 sc lk 3 gn d 4 sd o 5 sd i 6 se rm ode 7 vd d 8 ma x3 172 3 u1 sd i mo si sd o sd o miso to ut to ut sd i sd o gn d vc c 10 k r6 gn d vc c 4. 7k r5 vc c gn d spi mode 3- wi re mode mo si miso sd i sd o to ut mo si mis o sd i sd o to ut se rm ode vc c no co nn ect se rmod e gn d 1 2 3 4 5 6 7 8 9 10 jp 2 se rm ode se rmod e ss mo si sc k miso gn d vc c 15 0 r1 15 0 r2 15 0 r3 15 0 r4 0. 1uf c1 1 2 3 4 5 6 j1 1u f c2 pr ogra mmi ng head er - se ts up ei ther spi mode or 3- wi re mode (s ee di agr am to the ri ght ) _________________________________________________________________ maxim integrated products 4 figure 2. MAX31723PMB1 peripheral module schematic figure 3. MAX31723PMB1 peripheral module component placement guidecomponent side MAX31723PMB1 peripheral module
_________________________________________________________________ maxim integrated products 5 figure 4. MAX31723PMB1 peripheral module pcb layoutcomponent side figure 5. MAX31723PMB1 peripheral module pcb layoutinner layer 1 (ground) figure 6. MAX31723PMB1 peripheral module pcb layoutinner layer 2 (power) MAX31723PMB1 peripheral module
_________________________________________________________________ maxim integrated products 6 figure 7. MAX31723PMB1 peripheral module pcb layoutsolder side figure 8. MAX31723PMB1 peripheral module component placement guidesolder side MAX31723PMB1 peripheral module
part type MAX31723PMB1# peripheral module _________________________________________________________________ maxim integrated products 7 ordering information # denotes rohs compliant. MAX31723PMB1 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 8 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history MAX31723PMB1 peripheral module
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