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Precision Thermocouple to Digital Converter with Linearization

Simplifies Thermocouple Designs with Integrated Automatic Cold Junction Compensation and Linearization Correction

Product Details

Key Features

Parametric specs for Temperature Sensors
Sensor Type Remote
# Channels One
Interface 3-Wire/SPI
Functions Thermocouple-to-Digital Converter
Accuracy (±°C) 1.5
Parasite Pwr. No
Temp. Resolution (bits) 19
Oper. Temp. (°C) -55 to +125
Package/Pins TSSOP/10
TSSOP/14
Budgetary
Price (See Notes)
4.23
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Simplified Block Diagram

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Parameters

Parametric specs for Temperature Sensors
Sensor Type Remote
# Channels One
Interface 3-Wire/SPI
Functions Thermocouple-to-Digital Converter
Accuracy (±°C) 1.5
Parasite Pwr. No
Temp. Resolution (bits) 19
Oper. Temp. (°C) -55 to +125
Package/Pins TSSOP/10
TSSOP/14
Budgetary
Price (See Notes)
4.23

Key Features

  • Provides High-Accuracy Thermocouple Temperature Readings
    • Includes Automatic Linearization Correction for 8 Thermocouple Types
    • ±0.15% (max, -20°C to +85°C) Thermocouple Full-Scale and Linearity Error
    • 19-Bit, 0.0078125°C Thermocouple Temperature Resolution
  • Internal Cold-Junction Compensation Minimizes System Components
    • ±0.7°C (max, -20°C to +85°C) Cold-Junction Accuracy
  • ±45V Input Protection Provides Robust System Performance
  • Simplifies System Fault Management and Troubleshooting
    • Detects Open Thermocouples
    • Over- and Undertemperature Fault Detection
  • 50Hz/60Hz Noise Rejection Filtering Improves System Performance
  • 14-Pin TSSOP Package

Applications/Uses

  • Industrial Equipment
  • Industrial Ovens, Furnaces, and Environmental Chambers
  • Temperature Controllers

Description

The MAX31856 performs cold-junction compensation and digitizes the signal from any type of thermocouple. The output data is formatted in degrees Celsius. This converter resolves temperatures to 0.0078125°C, allows readings as high as +1800°C and as low as -210°C (depending on thermocouple type), and exhibits thermocouple voltage measurement accuracy of ±0.15%. The thermocouple inputs are protected against overvoltage conditions up to ±45V.

A lookup table (LUT) stores linearity correction data for several types of thermocouples (K, J, N, R, S, T, E, and B). Line frequency filtering of 50Hz and 60Hz is included, as is thermocouple fault detection. A SPI-compatible interface allows selection of thermocouple type and setup of the conversion and fault detection processes.

Simplified Block Diagram

MAX31856: Block Diagram MAX31856: 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 .