7Semi PT100 RTD 2-Wire Temperature Sensor Amplifier Breakout Board - MAX31865

he 7Semi PT100 RTD 2-Wire Temperature Sensor Amplifier Breakout Board based on the MAX31865 IC is a precision signal conditioning module designed for interfacing PT100 RTD temperature sensors with microcontrollers. It accurately amplifies and converts the analog resistance of the RTD into a digital signal over the SPI interface. The board supports 2-wire configuration and provides high accuracy, linearity, and stability for industrial and laboratory-grade temperature measurement. It is ideal for applications that require precise temperature monitoring and control.

Technical Specifications:

• IC: MAX31865 RTD-to-Digital Converter
  
• Sensor Compatibility: PT100 2-wire platinum RTD
  
• Interface: SPI digital communication
  
• Supported RTD Type: 100Ω at 0°C (PT100)
  
• Measurement Range: -200°C to +850°C (sensor dependent)
  
• Measurement Accuracy: ±0.5°C typical with high-quality RTD
  
• ADC Resolution: 15-bit delta-sigma ADC
  
• Supply Voltage: 3.0V to 5.5V
  
• Logic Level Compatibility: 3.3V and 5V
  
• Conversion Time: 52ms typical
  
• Sensor Excitation Current: 500µA nominal
  
• Noise Rejection: 50Hz and 60Hz rejection filters
  
• Protection: Open RTD detection and short-circuit protection
  
• Operating Temperature: -40°C to +125°C
  
• Board Type: Compact breakout with 2.54mm pitch header pins
  

Features:

• High-accuracy PT100 RTD amplifier with digital SPI interface
  
• Fully compatible with 2-wire RTD configuration
  
• Low-noise, high-resolution temperature conversion
  
• Built-in fault detection for sensor open and short conditions
  
• Factory-calibrated for linear response and stable output
  
• Supports both 3.3V and 5V logic systems
  
• Compact, breadboard-friendly breakout design
  
• Integrated cold-junction compensation for accurate readings
  
• Ideal for precise temperature measurement and control applications
  
• Compatible with Arduino, ESP32, STM32, and Raspberry Pi

Applications:

• Industrial temperature measurement and process control
  
• Laboratory and scientific instrumentation
  
• HVAC and environmental monitoring systems
  
• Thermal management in electronics and power systems
  
• IoT-based smart temperature monitoring
  
• Food and beverage temperature regulation
  
• Industrial automation and machine diagnostics
  
• Calibration and testing equipment
  
• Research and educational temperature sensing projects
  
• Precision thermal control in embedded systems