MAX31855

Cold-Junction Compensated Thermocouple-to-Digital Converter

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


Please check latest availability status for a specific part variant.

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 FAQs: MAX31855

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 NumberSensor TypeFunctionsInterfaceChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Resolution
(bits)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
See Notes
MAX31855 RemoteThermocouple-to-Digital ConverterSPIOne2No14-40 to +125
SOIC (N)/8
$3.11 @1k
See All Temperature Sensors (112)
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

CAD Symbols and Footprints

  • MAX31855EASA+
  • MAX31855EASA+T
  • MAX31855JASA+
  • MAX31855JASA+T
  • MAX31855KASA+
  • MAX31855KASA+T
  • MAX31855NASA+
  • MAX31855NASA+T
  • MAX31855RASA+
  • MAX31855RASA+T
  • MAX31855SASA+
  • MAX31855SASA+T
  • MAX31855TASA+
  • MAX31855TASA+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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