PRELIMINARY INFORMATION EVALUATION KIT AVAILABLE TC12 LOW COST, ONE WIRE DIGITAL THERMOMETER WITH SHUTDOWN 2 FEATURES GENERAL DESCRIPTION ■ ■ ■ ■ ■ The TC12 is a monolithic temperature sensor that outputs a pulse waveform whose duty cycle varies in direct proportion to measured temperature. This output format is easily converted to binary data using logic or the counter/ timer circuit on-board the system microcontroller. Typical accuracy is ±1°C over the rated measurement range of – 40°C to +125°C. It operates from supply voltages as low as 2.7V. Unlike voltage output temperature sensors, the digital output of the TC12 offers superior immunity to system noise and does not require an A/D converter. Unlike two wire serial temperature sensors, the TC12 communicates over a single wire, and without complex serial protocol overhead. ■ ■ ■ ■ Single Wire Interface to Host Microcontroller High Precision ................. ±1°C Accuracy (Typical) Wide Measurement Range .......... – 40°C to +125°C No External Components Required Complimentary (TC12C) or Open Drain Outputs (TC12N) Low Voltage Operation ........................ 2.7V to 5.5V Small Package ........................................ SOT-23A-5 Low Cost Shutdown Input APPLICATIONS ■ ■ ■ Notebook Computers File Servers Desktop Computers 1 3 4 ORDERING INFORMATION FUNCTIONAL BLOCK DIAGRAM VDD TEMPERATURE TO VOLTAGE CONVERTER Part No. Package Temp. Range Output Config. TC12CVCT SOT-23A-5* – 40°C to +125°C Complimentary TC12NVCT SOT-23A-5* – 40°C to +125°C Open Drain TC625EV Evaluation Kit for the TC12 and TC625 5 NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74). SHDN TC12 PIN CONFIGURATION SOT-23A-5* (Top View) DELTA SIGMA MODULATOR DOUT VDD NC 5 4 6 TYPICAL APPLICATION 2.7V to 5.5V TC12CVCT TC12NVCT MICRO CONTROLLER I/O TC12 1 2 3 7 DOUT SHDN GND NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74) MEASUREMENT ZONE 8 TC12-01 11/13/96 TELCOM SEMICONDUCTOR, INC. 2-31