MAX31855 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Cold-Junction Compensated Thermocouple-to-Digital Converter

19-5793; Rev 0; 3/11
MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
General Description
The MAX31855 performs cold-junction compensation
and digitizes the signal from a K, J, N, T, or E type ther-
mocouple. (Contact the factory for S and R type thermo-
couples.) The data is output in a signed 14-bit, SPI™-
compatible, read-only format. This converter resolves
temperatures to 0.25NC, allows readings as high as
+1800NC and as low as -270NC, and exhibits thermo-
couple accuracy of ±2NC for temperatures ranging from
-200NC to +700NC for K-type thermocouples. For full
range accuracies and other thermocouple types, see the
Thermal Characteristics specifications.
Applications
Industrial
Appliances
HVAC
Automotive
Features
S Cold-Junction Compensation
S 14-Bit, 0.25NC Resolution
S Versions Available for K, J, N, T, and E Type
Thermocouples (Contact Factory for S and R Type
Availability) (see Table 1)
S Simple SPI-Compatible Interface (Read-Only)
S Detects Thermocouple Shorts to GND or VCC
S Detects Open Thermocouple
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to: www.maxim-ic.com/MAX31855.related
Typical Application Circuit
VCC
0.1µF
MAX31855
GND
SO
T+
SCK
T-
CS
MICROCONTROLLER
MISO
SCK
SS
SPI is a trademark of Motorola, Inc.
����������������������������������������������������������������� Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.