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Home » NEWEST Products » New by Manufacturer » Maxim Integrated » MAX31865 RTD-to-Digital Converters - Maxim
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Maxim MAX31865 RTD-to-Digital Converters

Maxim MAX31865 RTD-to-Digital Converters

Maxim MAX31865 are easy-to-use resistance-to-digital converters 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 ±50V. Programmable detection of RTD and cable open and short conditions is included.


Features
  • 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
  • Conversion Time: 21ms max
  • 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125°C (Varies Due to RTD Nonlinearity)
  • Total Accuracy Over All Operating Conditions: 0.5°C (0.05% of Full Scale) max
  • ±50V Input Protection
  • Fully Differential VREF Inputs
  • Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element)
  • SPI-Compatible Interface
  • 20-Pin TQFN Package

Applications
  • Industrial Equipment
  • Instrumentation
  • Medical Equipment

Typical Application Circuit
Typical Application Circuit

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