Maxim MAX31865 RTD PT100/PT1000 Resistance Thermometer(SPI)

File:TArduinoMAX31865.png

Summary

The Maxim MAX31865 RTD PT100/PT1000 Resistance Thermometer component reads temperature from RTD sensors using SPI interface. It provides precise temperature measurements with configurable sensor settings and error detection.

Description

The MAX31865 is a precision resistance-to-digital converter designed for platinum resistance temperature detectors (RTDs). It provides high-accuracy temperature measurements from PT100 or PT1000 sensors with automatic error detection including under/over voltage, open circuit, and short circuit conditions. The component supports 2, 3, or 4-wire RTD configurations and offers configurable filtering, measurement timing, and threshold settings for industrial-grade temperature monitoring applications.

Diagram:

Properties

• Enabled – Enables or disables the component's functionality (Default: True).
• Filter(True=50Hz/False=60Hz) – Noise filter frequency selection (Default: False).
• In Fahrenheit – When enabled, temperature is output in Fahrenheit; otherwise in Celsius (Default: False).
• Name – The user-defined name for the component (Default: Thermometer).
• Sensor – RTD sensor configuration.
  • Count Wires – Number of RTD wires (Default: 4).
  • Custom – Custom sensor calibration.
    • Reference Resistor – Reference resistor value in ohms (Default: 430).
    • Zero Degree Resistance – Resistance at 0°C in ohms (Default: 100).
  • Measurement Time (mS) – Measurement duration in milliseconds (Default: 65).
  • Starting Time (mS) – Startup delay in milliseconds (Default: 10).
  • Type – RTD sensor type (Default: PT100).
• Single Shot – Single conversion mode (Default: True).
• SPISpeed – SPI communication speed in Hz (Default: 4000000).
• Threshold – Temperature threshold settings.
  • Max (Normalized) – Maximum threshold value (Default: 1).
  • Min (Normalized) – Minimum threshold value (Default: 0).

Pins

Input Pins

• Control (spi) – SPI control interface.
• Chip Select (digital) – Chip select input for SPI communication.

Output Pins

• A Errors – Analog error output.
• Automatic Test Reference Low – Automatic test reference low output.
• Manual Test Reference High – Manual test reference high output.
• Sensor Low – Sensor low signal output.
• Under/Over Voltage – Voltage error detection output.
• Check Threshold – Threshold checking output.
  • Min – Minimum threshold output.
  • Max – Maximum threshold output.
• Out – Main temperature output.
• Thermometer – Temperature measurement output.

Categories

• File:SPI.png – Components that use SPI communication protocol.
• File:Sensors.png – Temperature sensing components.
• File:Temperature.png – Temperature measurement components.
• File:Precision.png – High-precision measurement components.
• File:Industrial.png – Industrial-grade components.