Specifications

63Sensors: Featured Products
Complete Thermocouple Interface Designs Eliminate External
Components, Use Less Space (continued)
DS600, MAX1416, MAX6133, MAX31855
Figure 2 shows a fully integrated
thermocouple circuit using the
MAX31855 thermocouple-to-digital
converter. With the ADC, reference,
gain, and cold-junction compensation
all integrated, the MAX31855 measures
positive and negative temperature
values from a K-type thermocouple
and requires no external components.
Versions are available for use with J-, K-,
R-, S-, T-, and E-type thermocouples. Thus,
using the MAX31855 reduces part count,
design time, and system complexity.
The maximum measured temperature is
+1024.75°C. The 12-bit resolution results
in an LSB value of 0.25°C. In addition
to sensing thermocouple temperature,
the MAX31855 detects open circuits
and shorts to ground or supply.
For more information on temperature
sensing, refer to Maxim’s Thermal
Management Handbook at:
www.maxim-ic.com/thermal-handbook.
V
CC
GND
T+
T-
SO
SCK TO MICROCONTROLLER
THERMOCOUPLE
CS
3.3V
MAX31855
Figure 2. The MAX31855 is a complete thermocouple-to-digital converter for K-type thermocouples.