19-2235; Rev 1; 3/02
Cold-Junction-Compensated K-Thermocouple-
to-Digital Converter (0°C to +1024°C)
MAX6675
General Description
The MAX6675 performs cold-junction compensation
and digitizes the signal from a type-K thermocouple.
The data is output in a 12-bit resolution, SPI™-compati-
ble, read-only format.
This converter resolves temperatures to 0.25°C, allows
readings as high as +1024°C, and exhibits thermocou-
ple accuracy of 8LSBs for temperatures ranging from
0°C to +700°C.
The MAX6675 is available in a small, 8-pin SO package.
o
Direct Digital Conversion of Type -K
Thermocouple Output
o
Cold-Junction Compensation
o
Simple SPI-Compatible Serial Interface
o
12-Bit, 0.25°C Resolution
o
Open Thermocouple Detection
Features
Ordering Information
PART
MAX6675ISA
TEMP RANGE
-20°C to +85°C
PIN-PACKAGE
8 SO
Applications
Industrial
Appliances
HVAC
Automotive
GND
T-
T+
1
2
Pin Configuration
TOP VIEW
8
7
N.C.
SO
CS
SCK
MAX6675
3
6
5
V
CC
4
SO
SPI is a trademark of Motorola, Inc.
Typical Application Circuit
Vcc
0.1µF
MAX6675
GND
SO
T+
T-
SCK
CS
MISO
SCK
SSB
MICROCONTROLLER
68HC11A8
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
