Evaluates: MAX31865 MAX31865PMB1 Peripheral Module General Description Features and Benefits The MAX31865PMB1 peripheral module (Pmod) pro- Simple Conversion of Platinum RTD Resistance to vides the necessary hardware to interface the MAX31865 Digital Value RTD-to-digital converter to any system that utilizes Pmod- Handles 100 to 1k (at 0C) Platinum RTDs compatible expansion ports configurable for SPI com- (PT100 to PT1000) munication. The IC is an easy-to-use resistance-to-digital Compatible with 2-, 3-, and 4-Wire Sensor converter optimized for platinum resistance temperature Connections detectors (RTDs). This module is set up to operate with a 6-Pin Pmod-Compatible Connector (SPI) PT100 platinum RTD. RoHS Compliant For full range accuracies, other RTD types, and detailed information regarding operation of the IC, refer to the Proven PCB Layout MAX31865 IC data sheet. Fully Assembled and Tested Ordering Information appears at end of data sheet. Peripheral Module Board Photo Pmod is a trademark of Digilent Inc. 19-6909 Rev 0 1/14Evaluates: MAX31865 MAX31865PMB1 Peripheral Module J2 Detailed Description Two jumpers at J2 are provided to select either 2-wire SPI Interface or 3-wire RTD configuration. For 2-wire RTD, install both The MAX31865PMB1 Pmod can plug directly into a jumpers, from 1-2 and 3-4. For 3-wire RTD, install jumper Pmod-compatible port (configured for SPI) through from 3-4 only. connector J1. For information on the SPI protocol, refer to the MAX31865 IC data sheet. Power Supplies The Pmod is powered directly by the +3.3V power supply J1 provides connection of the module to the Pmod host. from the MAXUSB2PMB Munich board, pins 6 and 12 of The pin functions and pin assignments adhere to the connector J1. Pmod standard recommended by Digilent. See Table 1 for detailed descriptions. Software Graphical User CON1 Interface (GUI) Connector CON1 provides connection to the IC pins, as The Munich GUI is provided to facilitate the evaluation of follows: the Pmod. Connector CON1 pin 1 connects to FORCE+ and Visit www.maximintegrated.com/evkitsoftware to FORCE2 (pins 5 and 6) of the IC. download the latest version of the Munich GUI software, Connector CON1 pin 2 connects to RTDIN+ (pin 7) PMOD SPI.ZIP. Refer to the MAX318650PMB1 periph- of the IC. eral module and Munich (USB2PMB1) adapter board Quick Start Guide for step-by-step evaluation using the Connector CON1 pin 3 connects to RTDIN- (pin 8) of Munich GUI. the IC. Connector CON1 pin 4 connects to FORCE- (pin 9) of the IC. Table 1. Connector J1 (SPI Communication) PIN SIGNAL DESCRIPTION 1 SS Chip Select. Assert low to enable the SPI interface. 2 MOSI MAX31865 Serial-Data Input 3 MISO MAX31865 Serial-Data Output 4 SCLK MAX31865 Serial-Clock Input 5, 11 GND Ground 6, 12 V +3.3V Power Supplies CC Active-Low Push-Pull Data-Ready Output. DRDY goes low when a new conversion result is 7 DRDY available in the data register. When a read-operation of an RTD resistance data register occurs, DRDY returns high. 810 No Connection Maxim Integrated 2 www.maximintegrated.com