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TELCOM SEMICONDUCTOR, INC.

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PRELIMINARY INFORMATION

TC12

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.

LOW COST, ONE WIRE DIGITAL THERMOMETER WITH SHUTDOWN

PIN CONFIGURATION

FEATURES

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Single Wire Interface to Host Microcontroller

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High Precision .................

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Wide Measurement Range .......... – 40

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No External Components Required

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Complimentary (TC12C) or Open Drain Outputs

(TC12N)

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Low Voltage Operation ........................ 2.7V to 5.5V

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Small Package ........................................ SOT-23A-5

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Low Cost

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Shutdown Input

APPLICATIONS

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Notebook Computers

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File Servers

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Desktop Computers

ORDERING INFORMATION

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

NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74).

TC12-01 11/13/96

VDD

NC

DOUT

GND

SHDN

NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74)

SOT-23A-5*

(Top View)

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TC12CVCT

TC12NVCT

FUNCTIONAL BLOCK DIAGRAM

TYPICAL APPLICATION

TEMPERATURE

TO VOLTAGE

CONVERTER

DELTA SIGMA

MODULATOR

SHDN

TC12

I/O

MICRO

CONTROLLER

MEASUREMENT

ZONE

2.7V to 5.5V

TC12

EVALUATION

KIT

AVAILABLE