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MAX31855

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Cold-Junction Compensated Thermocouple-to-Digital Converter

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

Printable Data Sheet

Product Details

See parametric specs for Temperature Sensors

Key Features

See parametric specs for Temperature Sensors

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

See parametric specs for Temperature Sensors

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Simplified Block Diagram

Similar products you might be interested in

Exact equivalent in functionality and parametrics to the compared device:

Part No.	Description
MAX6675	Cold-Junction-Compensated K-Thermocouple-to-Digital Converter (0°C to +1024°C)
MAX6674	Cold-Junction-Compensated K-Thermocouple-to-Digital Converter (0°C to +128°C)

Technical Docs

	Data Sheet	Cold-Junction Compensated Thermocouple-to-Digital Converter	Feb 20, 2015
	App Note	Analog Integration Drives Factory Integration

Design & Development

Click any title below to view the detail page where available.

Hardware Development

Evaluation Board

MAX31855EVKIT

$110.19

Description/Applications

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.

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Features

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

Evaluation Board

MAX31855PMB1

$22.21

Description/Applications

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.

View Details

Features

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

Evaluation Board

MAXPMBAE

Description/Applications

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.

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Features

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

Reference Circuit

High-Performance Temperature Measurement Using Thermocouples and Precision Delta-Sigma ADCs, Part 2

Reference Circuit

High-Performance, High-Accuracy 4-20mA Current-Loop Transmitter Meets Toughest Industrial Requirements

Reference Circuit

Modern Thermocouples and a High-Resolution Delta-Sigma ADC Enable High-Precision Temperature Measurement

Additional Resources

Choosing the Best Type of Temperature Sensor

Evaluation Board

MAX31855EVKIT

Data Sheet

$110.19

Description/Applications

The MAX31855 evaluation kit (EV kit) provides the hardware and software (GUI) necessary to evaluate the MAX31855 cold-junction compensated thermocouple-to-digital converter.

View Details

Features

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

Evaluation Board

MAX31855PMB1

Data Sheet

$22.21

Description/Applications

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.

View Details

Features

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

Evaluation Board

MAXPMBAE

Data Sheet

Description/Applications

View Details

Features

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

Reference Circuit

High-Performance Temperature Measurement Using Thermocouples and Precision Delta-Sigma ADCs, Part 2

Reference Circuit

High-Performance, High-Accuracy 4-20mA Current-Loop Transmitter Meets Toughest Industrial Requirements

Reference Circuit

Modern Thermocouples and a High-Resolution Delta-Sigma ADC Enable High-Precision Temperature Measurement

Choosing the Best Type of Temperature Sensor

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 .

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

See parametric specs for Temperature Sensors

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 V_CC
- 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

Technical Docs

	Data Sheet	Cold-Junction Compensated Thermocouple-to-Digital Converter	Feb 20, 2015
	App Note	Analog Integration Drives Factory Integration

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 .

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INTERACTIVE Data Sheet

MAX31855

Cold-Junction Compensated Thermocouple-to-Digital Converter

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Similar products you might be interested in

Technical Docs

Design & Development

Support & Training

Parameters

Key Features

Applications/Uses

Description

Simplified Block Diagram

Technical Docs

Support & Training

MAX31855 Related Videos