MAX31851

Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters

Accurate 1-Wire Thermocouple-to-Digital Converter ICs Ease Design Effort and Lower System Cost

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Overview

Integration Reduces Design Time and Lowers System Cost
- 14-Bit, 0.25°C Resolution
- Integrated Cold-Junction Compensation
- Available for Multiple Thermocouples Types: Supports K-, J-, N-, T-, and E-Type (MAX31850); S- and R-Type (MAX31851)
- Detects Thermocouple Shorts to GND or VDD
- Detects Open Thermocouple
1-Wire Multiddrop Capability Simplifies Multisensor Systems
- 1-Wire Interface (Read-Only); Power Can Be Obtained from Interface (Parasite-Powered Mode)

The MAX31850/MAX31851 cold-junction compensated, 1-Wire^® thermocouple-to-digital converters perform cold-junction compensation and digitize the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The converters resolve temperatures to 0.25°C, allow readings as high as +1768°C and as low as -270°C, and exhibit thermocouple accuracy of 8 LSBs (2°C) for temperatures ranging from -200°C to +700°C.

Communication with the master microcontroller is over a 1-Wire bus that by definition requires only one data line (and ground) for communication. Operating power can be obtained directly from the data line (“parasite power”), eliminating the need for an external power supply.

Each device has a unique 64-bit serial code, which allows multiple units to function on the same 1-Wire bus. Therefore, it is simple to use one microcontroller (the master device) to monitor temperature from many thermocouples distributed over a large area.

Four location address inputs simplify mapping of individual units to specific locations.

Applications

Appliances
HVAC
Industrial
Medical

Documentation

Data Sheet 1

MAX31850-MAX31851: Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters Data Sheet (Rev.2) 01/09/2015

Reliability Data 1

MAX31851 Reliability Data 01/12/2023

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
MAX31855	PRODUCTION	Cold-Junction Compensated Thermocouple-to-Digital Converter

Evaluation Kits

Evaluation Kit for the MAX31850 and MAX31851

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Features and Benefits

Includes Everything Needed to Evaluate a MAX31850K with a K-Type Thermocouple
EV Kit Hardware is USB Powered (USB Cable Included)
Windows XP^®- and Windows^® 7-Compatible Operating System Software
USB HID Interface
Second Channel Allows Easy Evaluation of Other Thermocouple Types
Fully Assembled and Tested on Proven PCB Layout
RoHS Compliant

Product Details

The MAX31850/MAX31851 evaluation kit (EV kit) provides the hardware and software graphical user interface (GUI) necessary to evaluate the MAX31850/MAX31851 cold-junction compensated, 1-Wire^® thermocouple-to-digital converter.

The EV kit comes with a MAX31850KATB+ soldered to the PCB. This is the K-type thermocouple version of the device. Other thermocouple types can be evaluated by procuring the desired thermocouple, thermocouple socket, and corresponding MAX31850 or MAX31851. Contact the factory for free samples of the devices 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.