Cold-Junction Compensated Thermocouple-to-Digital Converter

Accurate Thermocouple-to-Digital Converter IC Simplifies Designs and Lowers System Cost
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Active: In Production.


The MAX31855 performs cold-junction compensation and digitizes the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The data is output in a signed 14-bit, SPI-compatible, read-only format. This converter resolves temperatures to 0.25°C, allows readings as high as +1800°C and as low as -270°C, and exhibits thermocouple accuracy of ±2°C for temperatures ranging from -200°C to +700°C for K-type thermocouples. For full range accuracies and other thermocouple types, see the Thermal Characteristics specifications in the full data sheet.

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 991.9kB)
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An evaluation board is available: MAX31855EVKIT MAX31855PMB1 MAXPMBAE

NOTE: This product uses the following:
MAX31855 EVkit Software

Key Features

  • Cold-Junction Compensation
  • 14-Bit, 0.25°C Resolution
  • Versions Available for K-, J-, N-, T-, S-, R-, and E-Type Thermocouples (see Table 1 in the full data sheet)
  • Simple SPI-Compatible Interface (Read-Only)
  • Detects Thermocouple Shorts to GND or VCC
  • Detects Open Thermocouple


  • Appliances
  • Automotive
  • HVAC
  • Industrial

Key Specifications:

Temperature Sensors
Part Number Sensor Type Functions Interface Remote Chan. Accuracy
Parasite Pwr. Temp. Resolution
Oper. Temp.
See Notes
MAX31855  Remote Thermocouple-to-Digital Converter SPI Single 2 No 14 -40 to +125 $3.11 @1k
See All Temperature Sensors (111)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX31855: Typical Application Circuit
Typical Application Circuit

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Information Index

Document Ref.: 19-5793 Rev 2; 2012-03-06
This page last modified: 2012-03-06