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Cold-Junction Compensated Thermocouple-to-Digital Converter

Accurate Thermocouple-to-Digital Converter IC Simplifies Designs and Lowers System Cost

Product Details

Key Features

Parametric specs for Temperature Sensors
Sensor Type Remote
# Channels One
Interface SPI
Functions Thermocouple-to-Digital Converter
Accuracy (±°C) 2
Parasite Pwr. No
Temp. Resolution (bits) 14
Oper. Temp. (°C) -40 to +125
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
3.47
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Simplified Block Diagram

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Parameters

Parametric specs for Temperature Sensors
Sensor Type Remote
# Channels One
Interface SPI
Functions Thermocouple-to-Digital Converter
Accuracy (±°C) 2
Parasite Pwr. No
Temp. Resolution (bits) 14
Oper. Temp. (°C) -40 to +125
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
3.47

Key Features

  • Integration Reduces Design Time and Lowers System Cost
    • 14-Bit, 0.25°C Resolution Converter
    • Integrated Cold-Junction Compensation
    • Versions Available for Most Common Thermocouple Types: K-, J-, N-, T-, S-, R-, and E-Type
    • Detects Thermocouple Shorts to GND or VCC
    • Detects Open Thermocouple
  • Interfaces to Most Microcontrollers
    • Simple SPI-Compatible Interface (Read-Only)

Applications/Uses

  • Appliances
  • Automotive
  • HVAC
  • Industrial

Description

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.

FAQs: MAX31855

Simplified Block Diagram

MAX31855: Typical Application Circuit MAX31855: Typical Application Circuit 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 .