Benefits and Features as specified in Analog Devices Datasheets:
• Integration Lowers System Cost, Simplifies Design Efforts, and Reduces Design Cycle Time
• Simple Conversion of Platinum RTD Resistance to Digital Value
• Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)
• Compatible with 2-, 3-, and 4-Wire Sensor Connections
• SPI-Compatible Interface
• High Accuracy Facilitates Meeting Error Budgets
• 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125NC (Varies Due to RTD Nonlinearity)
• Total Accuracy Over All Operating Conditions: 0.5NC (0.05% of Full Scale) max
• Fully Differential VREF Inputs • 21ms (max) Conversion Time
• Integrated Fault Detection Increases System Reliability
• ±45V Input Protection • Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element)
Thermocouple amplifiers are great for applications requiring extreme temperatures - but thermocouples don't have the best accuracy or precision, for when the readings must be as good as can be. The MAX31865 handles all of your RTD needs and can even compensate 3 or 4 wire RTDs for better accuracy. Connect to it with any 3.3V microcontroller over SPI and read out the resistance ratio from the internal ADC. We put a 400Ω 0.1% resistor as a reference resistor on the breakout. We have C drivers and some example code that will calculate the temperature based on the resistance for you on both the Raspberry Pi 3/4 and the Arduino NANO BLE 33 and Arduino H7.
Please note that required Raspberry Pi 3/4 or Arduino NANO BLE 33 and the 2/3/4 wire RTD100 Temperature probes must be provided by the user or purchased separately.