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Analog Devices / Maxim Integrated MAX31865 RTD-to-Digital Converters

Analog Devices Inc. MAX31865 RTD-to-Digital Converters 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
  • 21ms maximum conversion time
  • 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

Application Circuit

Application Circuit Diagram - Analog Devices / Maxim Integrated MAX31865 RTD-to-Digital Converters

Associated Tool

Analog Devices / Maxim Integrated MAX31865 Evaluation Kit

Provides the hardware and software necessary to evaluate the MAX31865 RTD-to-digital converter.

Learn Moreo Analog Devices / Maxim Integrated MAX31865 Evaluation Kit View Productspowiązany z Analog Devices / Maxim Integrated MAX31865 Evaluation Kit
Opublikowano: 2014-02-11 | Zaktualizowano: 2023-04-11