MAX31865 - PT100 RTD Temperature Sensor Amplifier

Precision RTD Digitization: Powered by the Maxim MAX31865 IC, designed specifically to handle signal conditioning, amplification, and 15-bit ADC conversion for platinum resistance thermometers.

Universal 2, 3, and 4-Wire RTD Compatibility: Features configurable board jumpers and screw terminal blocks allowing flexible interfacing with 2-wire, 3-wire, or 4-wire PT100 or PT1000 sensors.

15-Bit High-Resolution Sensing: Converts resistance to digital values with an impressive resolution down to $0.03125^\circ\text{C}$ and accurate overall system performance up to $0.5^\circ\text{C}$.

Standard SPI Interface: Communicates seamlessly over a 4-wire SPI digital interface, making it easily compatible with Arduino, Raspberry Pi, ESP32, and STM32 microcontrollers.

Integrated Fault Detection: Features built-in detection for open RTD elements, short circuits to overvoltage/undervoltage lines, and out-of-range thermal readings.

Board Material: High-grade FR-4 glass-epoxy breakout PCB with precision SMD reference resistors (430Ω 0.1% standard for PT100), terminal blocks, and header pins.

Technical Specifications:

Input Voltage: 3.3V – 5.0V DC (onboard 3.3V regulator and level shifting).

Supported Sensor Types: PT100 (standard $430\ \Omega$ reference) or PT1000.

Communication Protocol: SPI (Mode 1 or Mode 3).

Board Color: Purple PCB with Green Terminal Blocks.

Usage Advice: Solder the appropriate jumper pads (2-wire, 3-wire, or 4-wire configuration) before connecting your probe to match your specific PT100 wiring layout.

Maintenance: Keep the breakout board free of conductive dust, solder splatter, and flux residue to maintain high-impedance analog measurement accuracy.

Essential High-Precision Thermal Breakout: Position as the definitive amplifier solution for makers and engineers looking to upgrade from noisy thermistors to scientific-grade PT100 RTD sensors.

Highlight 3-Wire / 4-Wire Lead Compensation: Emphasize how the MAX31865 automatically compensates for lead wire resistance, allowing accurate remote temperature monitoring over long cable runs.

Recommended Cross-Sell Add-ons: Pair with PT100 Platinum Resister Temp Sensor Probe -20℃~450, PT1000 Platinum Resister Temp Sensor Probe -40 ~ 450℃, MAX31855 K Thermocouple Temperature Measurement Sensor, and ESD antistatic mat 50x40CM PCB Welding Mat.

Featured Collection Star: Display prominently on your Temperature Sensor Probes collection page as your go-to RTD amplifier breakout module.