MAX31855

Cold-Junction Compensated Thermocouple-to-Digital Converter

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


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.
MAX31855: Typical Application Circuit MAX31855: Typical Application Circuit Enlarge+

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
Part Number Sensor Type Functions Interface Remote Chan. Accuracy
(±°C)
Parasite Pwr. Temp. Resolution
(bits)
Oper. Temp.
(°C)
Budgetary
Price
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.


MAX31855EVKIT: Evaluation Kit for the MAX31855
MAX31855PMB1: MAX31855PMB1 Peripheral Module
MAXPMBAE: Maxim Analog Essentials Collection of Peripheral Modules

Tools & Models

Software
MAX31855 EVkit Software

 

Related Resources


MAX31856
Precision Thermocouple to Digital Converter with Linearization

  • Provides High-Accuracy Thermocouple Temperature Readings
  • Internal Cold-Junction Compensation Minimizes System Components
  • ±45V Input Protection Provides Robust System Performance

MAX31915
Industrial, Octal, Digital Input Translator

  • Flexible Supply Options Enables Usage in 24V, 12V, and 5V Supplied Systems
  • Low Power and Low Heat Dissipation
  • Configurability Enables a Wide Range of Standard and Custom Applications

MAX31914
Ultra-Low Power Industrial, Octal, Digital Input Translator

  • Flexible Supply Options Enables Usage in 24V, 12V, and 5V Supplied Systems
  • Low Power and Low Heat Dissipation
  • Configurability Enables a Wide Range of Standard and Custom Applications

MAX14838
24V Pin-Configurable Industrial Sensor Output Drivers

  • High Configurability Simplifies Design
  • Integrated Protection Provides Robust Sensor Solutions
  • Fast Turn-Off of Inductive Loads Up to 1.5H

MAX14839
24V Pin-Configurable Industrial Sensor Output Drivers

  • High Configurability Simplifies Design
  • Integrated Protection Provides Robust Sensor Solutions
  • Fast Turn-Off of Inductive Loads Up to 1.5H

MAX21105
Low-Power, Ultra-Accurate 6 DoF IMU

  • Accurate and Stable Performance Over Temperature for Platform Stabilization
  • Low-Power Operation Extends Battery Life
  • Compact Package Reduces Board Space and Enhances Device Reliability

MAX35102
Time-to-Digital Converter Without RTC

  • High-Accuracy Flow Measurement for Billing and Leak Detection
  • High-Accuracy Temperature Measurement for Precise Heat and Flow Calculations
  • Maximizes Battery Life with Low Device and Overall System Power