19-6332; Rev 0; 5/12 MAX31723PMB1 Peripheral Module General Description The MAX31723PMB1 peripheral module provides the necessary hardware to interface the MAX31723 digital thermometer and thermostat to any system that utilizes PmodK-compatible expansion ports configurable for SPI and/or GPIO communication. The IC provides temperature-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 applications 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 thermal runaway conditions must be detected quickly. The thermostat has a dedicated open-drain output (TOUT). Two thermostat operating modes (comparator and interrupt) control thermostat operation based on user-defined nonvolatile trip points (THIGH and TLOW). Refer to the MAX31723 IC data sheet for detailed information regarding operation of the IC. Features S Measures Temperatures from -55NC to +125NC S Thermometer Accuracy is Q0.5NC 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 Ordering Information appears at end of data sheet. MAX31723PMB1 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. MAX31723PMB1 Peripheral Module Component List DESIGNATION C1 DESCRIPTION DESIGNATION QTY 0.1FF Q10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C104KA01D R1–R4 4 150I Q5% resistors (0603) R5 1 4.7kI Q5% resistor (0603) R6 1 10kI Q5% resistor (0603) QTY 1 DESCRIPTION C2 1 1FF Q10%, 10V X7R ceramic capacitor (0603) TDK C1608X7R1A105K U1 1 Digital thermometer and thermostat (8 FMAXM) Maxim MAX31723MUA+ J1 1 6-pin right-angle male header — 3 Shorting jumpers 1 10-pin (2 x 5) straight male header — 1 PCB: EPCB31723PM1 JP1 Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX31723PMB1 when contacting these component suppliers 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 hostside interface must be configured as GPIO to allow for bitbanged communication. 3-wire mode has the advantage of freeing up an interface pin on the IC to allow for connection to the thermostat/alarm output. See Table 1. The JP1 jumper block is used to configure the communication mode with the host board. The peripheral module can communicate in either SPI or 3-wire mode. The correct shunt settings are shown in Table 2 and Figure 1. Table 1. Connector J1 (SPI/3-Wire Communication) PIN SIGNAL DESCRIPTION 1 SS Chip enable. Must be asserted high for communication to take place for either the SPI or 3-wire interface. 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 2 µMAX is a registered trademark of Maxim Integrated Products, Inc. __________________________________________________________________ Maxim Integrated Products 2 MAX31723PMB1 Peripheral Module Table 2. Connector JP1 (Serial-Bus Type Selection) SHUNT SPI MODE 3-WIRE MODE 1 3-5 1-2 2 4-6 3-5 3 9-10 4-6 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. 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). SPI MODE 3-WIRE MODE The complete software kit is available for download at www.maxim-ic.com. Quick start instructions are also available as a separate document. Figure 1. JP1 Jumper Settings __________________________________________________________________ Maxim Integrated Products 3 MAX31723PMB1 Peripheral Module VCC R5 4.7k J1 1 2 3 4 5 6 R1 R2 R3 R4 150 150 150 150 U1 1 TOUT 2 SS MOSI MISO SCK GND VCC 3 GND 4 MAX31723 TOUT VDD CE SERMODE SCLK SDI GND SDO 8 VCC 7 SERMODE 6 SDI 5 SDO R6 10k GND C2 1uF C1 VCC GND 0.1uF GND JP2 SDI MOSI SDO SERMODE 1 3 5 7 9 2 4 6 8 10 SDO MISO VCC TOUT MOSI SDI MOSI SDI MISO SDO MISO SDO TOUT TOUT no connect SERMODE Programming header - sets up either SPI mode or 3-Wire mode (see diagram to the right) VCC SPI mode SERMODE GND 3-Wire mode Figure 2. MAX31723PMB1 Peripheral Module Schematic Figure 3. MAX31723PMB1 Peripheral Module Component Placement Guide—Component Side __________________________________________________________________ Maxim Integrated Products 4 MAX31723PMB1 Peripheral Module Figure 4. MAX31723PMB1 Peripheral Module PCB Layout—Component Side Figure 5. MAX31723PMB1 Peripheral Module PCB Layout—Inner Layer 1 (Ground) Figure 6. MAX31723PMB1 Peripheral Module PCB Layout—Inner Layer 2 (Power) __________________________________________________________________ Maxim Integrated Products 5 MAX31723PMB1 Peripheral Module Figure 7. MAX31723PMB1 Peripheral Module PCB Layout—Solder Side Figure 8. MAX31723PMB1 Peripheral Module Component Placement Guide—Solder Side __________________________________________________________________ Maxim Integrated Products 6 MAX31723PMB1 Peripheral Module Ordering Information PART TYPE MAX31723PMB1# Peripheral Module #Denotes RoHS compliant. __________________________________________________________________ Maxim Integrated Products 7 MAX31723PMB1 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 8 Maxim is a registered trademark of Maxim Integrated Products, Inc.