MAX31865 Platinum PT100 RTD Temperature Sensor Amplifier Module

The MAX31865 is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form. The MAX31865’s inputs are protected against overvoltage faults as large as Q45V. Programmable detection of RTD and cable open and short conditions is included.

In stock

SKU PRD-00002714
Category: ModulesSensors
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Product Details


  • Integration Lowers System Cost, Simplifies Design Efforts, and Reduces Design Cycle Time
    • Simple Conversion of Platinum RTD Resistance to Digital Value
    • Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)
    • Compatible with 2-, 3-, and 4-Wire Sensor Connections
    • SPI-Compatible Interface
  • High Accuracy Facilitates Meeting Error Budgets
    • 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125NC (Varies Due to RTD Nonlin-
    • Total Accuracy Over All Operating Conditions:0.5NC (0.05% of Full Scale) max
    • Fully Differential VREF Inputs
    • 21ms (max) Conversion Time
  • Integrated Fault Detection Increases System Reliability
    • ±45V Input Protection
    • Fault Detection (Open RTD Element, RTD Shorted to
    • Out-of-Range Voltage, or Short Across RTD Element)
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