MAX6674

19-2241; Rev 1; 8/02 Cold-Junction-Compensated K-Thermocoupleto-Digital Converter (0°C to +128°C) General Description The MAX6674 cold-junction-compensation thermocouple-to-digital converter performs cold-junction compensation and digitizes the signal from a type-K thermocouple. The data is output in a 10-bit resolution, SPI™-compatible, read-only format. This converter resolves temperatures to 0.125°C, allows readings as high as +128°C, and exhibits thermocouple accuracy of ±2°C for temperatures ranging from 0°C to +125°C. The MAX6674 is available in a small, 8-pin SO package. o Cold-Junction Compensation o Simple SPI-Compatible Serial Interface o 10 Bit, 0.125°C o Open Thermocouple Detection Features MAX6674 Ordering Information PART MAX6674ISA TEMP RANGE -20°C to +85°C PIN-PACKAGE 8 SO Applications Industrial Appliances HVAC Automotive GND TT+ 1 2 Pin Configuration TOP VIEW 8 7 N.C. SO CS SCK MAX6674 3 6 5 VCC 4 SPI is a trademark of Motorola, Inc. SO Typical Application Circuit Vcc 0.1µF MICROCONTROLLER 68HC11A8 MAX6674 GND SO T+ TSCK CS MISO SCK SSB ________________________________________________________________ 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. Cold-Junction-Compensated K-Thermocoupleto-Digital Converter (0°C to +128°C) MAX6674 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to GND) ...................................