MAX31855

PRODUCTION

Cold-Junction Compensated Thermocouple-to-Digital Converter

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

Data Sheet (Rev. 5)
Part Models
14
1ku List Price
Starting From $4.09
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Part Details

  • 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)
MAX31855
Cold-Junction Compensated Thermocouple-to-Digital Converter
MAX31855: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 4

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Software Resources

Device Drivers 1

Hardware Ecosystem

Parts Product Life Cycle Description
Analog to Digital Converters 2
MAX6675
PRODUCTION Cold-Junction-Compensated K-Thermocouple-to-Digital Converter (0°C to +1024°C)
MAX6674
NOT RECOMMENDED FOR NEW DESIGNS Cold-Junction-Compensated K-Thermocouple-to-Digital Converter (0°C to +128°C)
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Tools & Simulations

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

Software Development 2

Evaluation Kits

eval board
schematic 1
MAX31855EVKIT

Evaluation Kit for the MAX31855

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Features and Benefits

  • Includes Everything Needed to Evaluate a K-Type Thermocouple
  • EV Kit Hardware is USB Powered (USB Cable Included)
  • Windows XP®, Windows Vista®, and Windows® 7 Operating Systems-Compatible Software
  • USB HID Interface
  • Graphical User Interface (GUI) Consists of a Single .EXE File
  • Second Channel Allows Easy Evaluation of Other Thermocouple Types
  • RoHS Compliant

Product Details

The MAX31855 evaluation kit (EV kit) provides the hardware and software (GUI) necessary to evaluate the MAX31855 cold-junction compensated thermocouple-to-digital converter.
The MAX31855 EV kit comes with a MAX31855KASA+ soldered to the PCB. This is the K-type thermocouple version of the MAX31855. Other thermocouple types can be evaluated by procuring the desired thermocouple, thermocouple socket, and corresponding MAX31855. Contact the factory for free samples of the MAX31855 to match your desired thermocouple type. See the Evaluating Other Thermocouple Types section in the full data sheet for part numbers and additional information regarding other thermocouple types.

Applications

  • Appliances
  • Automotive
  • HVAC
  • Industrial

MAXPMBAE

Maxim Analog Essentials Collection of Peripheral Modules

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Features and Benefits

  • Data Converter, Interface, Clock, Sensor, and Other Modules Included to Address Many Design Needs
  • Plug in Modules Enable Rapid Hardware Prototyping
  • Proven Software Drivers Reduce Development Time
  • FPGA Configuration Files Included to Simplify Design Effort

Product Details

Maxim Analog Essentials is a collection of peripheral modules which can plug directly into any FPGA/CPU expansion port which follows the Pmod™ standard established by Digilent, Inc. The collection includes modules containing a wide variety of commonly used analog and mixed signal functions. The modules are supported by software which includes FPGA configuration files for three popular FPGA platforms: Avnet LX-9, Digilent Nexys 3 and Avnet ZEDBoard, as well as example programs to exercise and demonstrate each module. While the example programs demonstrate the module’s functionality, they are well partitioned and documented allowing the core routines to be easily cut and pasted into your own programs. The combination of plug-in simplicity and easy software integration allows for quick migration from idea to working prototype.

eval board
schematic 2
MAX31855PMB1

MAX31855PMB1 Peripheral Module

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Features and Benefits

  • Converts Output of a K-Type Thermocouple Directly to a Signed 14-Bit Digital Word
  • Cold-Junction Compensation
  • 14-Bit, 0.25°C Resolution
  • Detects Thermocouple Shorts to GND or VCC
  • Detects Open Thermocouple
  • 6-Pin Pmod-Compatible Connector (SPI)
  • Example Software Written in C for Portability
  • RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX31855PMB1 peripheral module provides the necessary hardware to interface the MAX31855 cold-junction compensated thermocouple-to-digital converter to any system that utilizes Pmod™-compatible expansion ports. The IC performs cold-junction compensation and digitizes the signal from a thermocouple. Versions of the IC are available that operate with a K-, J-, N-, T-, R-, or E-type thermocouple. This module is set up to operate with a K-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, other thermocouple types, and detailed information regarding operation of the IC, refer to the MAX31855 IC data sheet.
Note: K-type thermocouple is not included with Maxim Peripheral Module collections.

Applications

  • Appliances
  • Automotive
  • HVAC
  • Industrial Equipment
MAX31855EVKIT
Evaluation Kit for the MAX31855
MAX31855EVKIT: Evaluation Kit Contents
MAXPMBAE
Maxim Analog Essentials Collection of Peripheral Modules
MAX31855PMB1
MAX31855PMB1 Peripheral Module
MAX31855PMB1 Board Photo

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