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MAX31855

Cold-Junction Compensated Thermocouple-to-Digital Converter

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

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

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.

Data Sheet

Download	Rev 1	(PDF, 1.2MB)
E-Mail

An evaluation kit is available: MAX31855EVKIT

NOTE: This product uses the following:
MAX31855 EVkit Software

Key Features

Cold-Junction Compensation
14-Bit, 0.25°C Resolution
Versions Available for K-, J-, N-, T-, S-, R-, and E-Type Thermocouples (see Table 1 in the full data sheet)
Simple SPI-Compatible Interface (Read-Only)
Detects Thermocouple Shorts to GND or V_CC
Detects Open Thermocouple

Applications/Uses

Appliances
Automotive
HVAC
Industrial

Key Specifications:

Temperature Sensors

Part Number

Sensor Type

Functions

Interface

Remote Chan.

Accuracy
(±°C)

Parasite Pwr.

Temp. Resolution
(bits)

Oper. Temp.
(°C)

Smallest Available Pckg.
(mm²)

Budgetary Price

max w/pins

See Notes

MAX31855

Remote

Thermocouple-to-Digital Converter

3-Wire/SPI

Single

-40 to +125

30.9

$3.11 @1k

See All Temperature Sensors (103)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Application Circuit

Application Notes

Reference Design 5032

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

Product Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report:

MAX31855.pdf

Software/Models

MAX31855 EVkit Software

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX31855EASA+			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855EASA+T			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855JASA+			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855JASA+T			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855KASA+			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855KASA+T			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855NASA+			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855NASA+T			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855RASA+			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855RASA+T			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX31855SASA+			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855SASA+T			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855TASA+			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX31855TASA+T			Active	SOIC(N);8 pin;30.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX31855EVKIT

Evaluation Kit for the MAX31855

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