View max6675 datasheet:

19-2235; Rev 0; 10/01 Cold-Junction-Compensated K-Thermocouple- to-Digital Converter (0°C to +1024°C) General Description Features The MAX6675 performs cold-junction compensation Cold-Junction Compensation and digitizes the signal from a type-K thermocouple. Simple SPI-Compatible Serial Interface The data is output in a 12-bit resolution, SPI™-compati- ble, read-only format. 12-Bit, 0.25°C Resolution This converter resolves temperatures to 0.25°C, allows Open Thermocouple Detection 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. Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX6675ISA -20°C to +85°C 8 SO Applications Pin Configuration