RAKwireless RAK12022

RAK12022 is a PT100 IO module that uses MAX31865, an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form. The MAX31865’s inputs are protected against overvoltage faults as large as 45 V. Programmable detection of RTD and cable open and short conditions is included.

Key features:

• Based on MAX31965
• Compatible with 2-wire, 3-wire, and 4-wire sensor connections
• SPI-compatible interface
• 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125 NC (varies due to RTD nonlinearity)
• Total accuracy overall operating conditions: 0.5 NC (0.05% of full scale) max
• Fully differential VREF inputs
• 21 ms (max) conversion time
• Power supply: 3.3 V
• Operating temperature: -40° C ~ 85° C
• Module size 25x35mm