MAX31865 PT100/PT1000 RTD-to-Digital Temperature Sensor Module
MAX31865 PT100/PT1000 RTD-to-Digital Temperature Sensor Module
MAX31865 PT100/PT1000 RTD-to-Digital Converter Temperature Sensor Module
Take your temperature measurement projects to the next level with the MAX31865 RTD-to-Digital Converter Module. Designed for makers, engineers, and electronics enthusiasts, this high-precision sensor amplifier module converts PT100 or PT1000 platinum resistance temperature detector (RTD) signals into accurate digital readings — all with minimal setup. Whether you're building an industrial monitoring system, a lab instrument, or a DIY automation project, this module delivers rock-solid accuracy and flexible compatibility. Made in Mainland China.
Key Features
- Ultra-High Resolution: 15-bit ADC with a temperature resolution of 0.03125°C for precise, fine-grained readings.
- Wide Voltage Compatibility: Operates on 3.0V–5.5V, fully compatible with both 3.3V and 5V microcontrollers (Arduino, Raspberry Pi, ESP32, and more).
- SPI Communication: Fast and reliable SPI interface supporting clock speeds up to 5MHz for seamless integration.
- Excellent Accuracy: Maximum measurement error of ±0.5°C (0.05% full scale) across the entire temperature range.
- Fast Conversion: Maximum conversion time of just 21ms for near real-time temperature data.
- Robust Input Protection: ±45V overvoltage protection, plus built-in RTD open-circuit and short-circuit fault detection.
- Broad Sensor Support: Compatible with PT100 and PT1000 platinum resistance sensors in 2-wire, 3-wire, or 4-wire configurations.
- Easy Installation: Standard 2.54mm pin header and mounting holes — works with breadboards and PCB soldering.
- Wide Operating Range: Chip operates from -40°C to +125°C for demanding environments.
Technical Specifications
| Parameter | Value |
|---|---|
| Power Supply Voltage | 3.0V – 5.5V |
| Operating Current | ~1.5mA (typical) |
| Communication Interface | SPI (max 5MHz clock) |
| ADC Resolution | 15-bit |
| Temperature Resolution | 0.03125°C |
| Measurement Accuracy | Max ±0.5°C (0.05% full scale) |
| Conversion Time | Max 21ms |
| Input Overvoltage Protection | ±45V |
| Sensor Compatibility | PT100 / PT1000, 2/3/4-wire |
| Chip Operating Temperature | -40°C to +125°C |
| Connector | 2.54mm Pin Header |
| Battery Required | No |
What's in the Box
- 1× MAX31865 PT100/PT1000 RTD-to-Digital Converter Temperature Sensor Module
Notes
- Color may vary slightly due to display and lighting differences.
- Please allow 1mm–1cm dimensional tolerance due to manual measurement.
Learn More
For information on best practices in electronic measurement and sensor calibration, visit the National Institute of Standards and Technology (NIST) Calibration Services — the authority on measurement accuracy and standards in the US.
Frequently Asked Questions
Q: Is the MAX31865 module compatible with Arduino and Raspberry Pi?
A: Yes! The MAX31865 RTD-to-Digital Converter Module supports 3.3V and 5V logic levels, making it fully compatible with Arduino, Raspberry Pi, ESP32, ESP8266, and most popular microcontroller platforms via the SPI communication interface.
Q: What type of RTD sensors work with this module?
A: This module supports both PT100 and PT1000 platinum resistance temperature detectors (RTDs). It is also compatible with 2-wire, 3-wire, and 4-wire sensor configurations, giving you flexible options depending on your accuracy requirements and wiring setup.
Q: How accurate is the MAX31865 temperature sensor module?
A: The MAX31865 module offers a 15-bit ADC resolution with a temperature resolution of 0.03125°C and a maximum measurement error of ±0.5°C (0.05% full scale) across the full operating temperature range — making it one of the most precise RTD converter modules available for DIY and professional applications.
Q: Does the module have any built-in fault protection?
A: Yes. The module includes ±45V overvoltage input protection and built-in fault detection for RTD open-circuit and short-circuit conditions, ensuring reliable operation and protection for both the module and your connected components.