View source for Maxim MAX31865 RTD PT100/PT1000 Resistance Thermometer(SPI)

[[Image: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.

<b>Diagram:</b>

[[Image:TArduinoMAX31865.Preview.png]]

== 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 ==
*[[Image:SPI.png]] [[Category:SPI]] – Components that use SPI communication protocol.
*[[Image:Sensors.png]] [[Category:Sensors]] – Temperature sensing components.
*[[Image:Temperature.png]] [[Category:Temperature]] – Temperature measurement components.
*[[Image:Precision.png]] [[Category:Precision]] – High-precision measurement components.
*[[Image:Industrial.png]] [[Category:Industrial]] – Industrial-grade components.

[[Category:Components]]