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Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters

Accurate 1-Wire Thermocouple-to-Digital Converter ICs Ease Design Effort and Lower System Cost

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Integration Reduces Design Time and Lowers System Cost
    • 14-Bit, 0.25°C Resolution
    • Integrated Cold-Junction Compensation
    • Available for Multiple Thermocouples Types: Supports K-, J-, N-, T-, and E-Type (MAX31850); S- and R-Type (MAX31851)
    • Detects Thermocouple Shorts to GND or VDD
    • Detects Open Thermocouple
  • 1-Wire Multiddrop Capability Simplifies Multisensor Systems
    • 1-Wire Interface (Read-Only); Power Can Be Obtained from Interface (Parasite-Powered Mode)

Applications/Uses

  • Appliances
  • HVAC
  • Industrial
  • Medical

Description

The MAX31850/MAX31851 cold-junction compensated, 1-Wire® thermocouple-to-digital converters perform cold-junction compensation and digitize the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The converters resolve temperatures to 0.25°C, allow readings as high as +1768°C and as low as -270°C, and exhibit thermocouple accuracy of 8 LSBs (2°C) for temperatures ranging from -200°C to +700°C.

Communication with the master microcontroller is over a 1-Wire bus that by definition requires only one data line (and ground) for communication. Operating power can be obtained directly from the data line (“parasite power”), eliminating the need for an external power supply.

Each device has a unique 64-bit serial code, which allows multiple units to function on the same 1-Wire bus. Therefore, it is simple to use one microcontroller (the master device) to monitor temperature from many thermocouples distributed over a large area.

Four location address inputs simplify mapping of individual units to specific locations.

Simplified Block Diagram

MAX31850, MAX31851: Block Diagram MAX31850, MAX31851: Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .