The MAX31865PMB1 peripheral module provides the necessary hardware to interface the MAX31865 RTD-to-digital converter to any system that utilizes Pmod compatible expansion ports configurable for SPI communication. The IC is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). This module is set up to operate with a PT100 platinum RTD.
When using the MAX31865 PMOD board, the 3.3 V power comes directly from the host board it is connected to. The power from the host is generally capable of providing up to 100 mA at 3.3 V; but for complete PMOD power specifications, please clickhere.
Connector CON1 provides connection to the IC pins, as follows:
Two jumpers at J2 are provided to select either 2-wire or 3-wire RTD configuration. For 2-wire RTD, install both jumpers, from 1-2 and 3-4. For 3-wire RTD, install jumper from 3-4 only.
The PMOD interface is a series of standardized digital interfaces for various digital communication protocols such as SPI, I2C, and UART. These interface types were standardized by Digilent, which is now a division of National Instruments. Complete details on the PMOD specification can be found here.
The MAX31865PMB1 peripheral module can plug directly into a Pmod-compatible port (configured for SPI) through connector J1. Connector J1 provides a connection of the module to the host. The pin functions and pin assignments adhere to the Pmod standard recommended by Digilent.
There are two device driver solutions that are provided for controlling the MAX31865PMB1:
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