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| PRELIMINARY INFORMATION EVALUATION KIT AVAILABLE 1 TC12 LOW COST, ONE WIRE DIGITAL THERMOMETER WITH SHUTDOWN FEATURES s s s s s s s s s Single Wire Interface to Host Microcontroller High Precision ................. 1C Accuracy (Typical) Wide Measurement Range .......... - 40C to +125C 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 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 1C over the rated measurement range of - 40C to +125C. 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. 2 3 4 5 6 7 APPLICATIONS s s s Notebook Computers File Servers Desktop Computers ORDERING INFORMATION Part No. TC12CVCT TC12NVCT FUNCTIONAL BLOCK DIAGRAM Package Temp. Range Output Config. Complimentary Open Drain SOT-23A-5* - 40C to +125C SOT-23A-5* - 40C to +125C TEMPERATURE TO VOLTAGE CONVERTER VDD TC625EV Evaluation Kit for the TC12 and TC625 NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74). TC12 DELTA SIGMA MODULATOR SHDN PIN CONFIGURATION SOT-23A-5* (Top View) DOUT VDD 5 NC 4 TYPICAL APPLICATION 2.7V to 5.5V TC12CVCT TC12NVCT MICRO CONTROLLER 1 2 3 I/O DOUT SHDN GND NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74) TC12 MEASUREMENT ZONE 8 TC12-01 11/13/96 TELCOM SEMICONDUCTOR, INC. 2-31 |
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