Maxim MAX31865 RTD PT100/PT1000 Resistance Thermometer(SPI)

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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 PT100,PT1000,Custom (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

  • Automatic Test (clock) – Starts an automatic self-test cycle.
  • Manual Test (digital) – Triggers a manual self-test.
  • Clock – System clock input.

Output Pins

  • Reference Low (digital) – Reference resistor low error signal.
  • Reference High (digital) – Reference resistor high error signal.
  • Sensor Low (digital) – Sensor low signal output.
  • Under/Over Voltage (digital) – Indicates voltage error detection.

Threshold Checking Outputs

  • Min (digital) – Minimum threshold reached.
  • Max (digital) – Maximum threshold reached.

Temperature Output

  • Out (analog) – Main analog temperature output.

SPI Interface

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

Categories

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