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MAX31856

MAX31856

Precision Thermocouple to Digital Converter with Linearization

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

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Overview

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.

MAX31856: Block Diagram MAX31856: Block Diagram Enlarge+

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

Parametric Specs

Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
(±°C)		Parasite Pwr.Temp. Resolution
(bits)		Oper. Temp.
(°C)		Package/PinsBudgetary
Price
See Notes
MAX31856 RemoteThermocouple-to-Digital Converter3-Wire/SPIOne1.5No19-55 to +125
TSSOP/10
TSSOP/14
$3.80 @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.

Design Resources


MAX31856EVSYS: Evaluation System for MAX31856

Technical Documents

App Note 6550 The Basics of Thermocouples
App Note 6508 How to Implement a 4-20mA Transmitter with the MAX12900
Tutorial 6500 Temperature Sensor Tutorial

Quality and Environmental Data

Product Reliability Reports: MAX31856.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX31856 IBIS Model
  • MAX31856PMB1 Gerber File

    • CAD Symbols and Footprints

  • MAX31856MUD+
  • MAX31856MUD+T
    •

    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

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    Tools & Models

    Technical Docs

    Reference Designs

    Type ID Title
    Evaluation Board8705MAX31856EVSYS Evaluation System for MAX31856

    Events


    Belle Isle 2020
    05/29/2020 - 05/31/2020, Detroit, MI
    2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.

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