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PRELIMINARY INFORMATION
EVALUATION
KIT
AVAILABLE
TC12
LOW COST, ONE WIRE DIGIT AL THERMOMETER WITH SHUTDOWN
FEATURES
■ 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
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.
ORDERING INFORMATION
1
2
3
4
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
TO VOLTAGE
CONVERTER
TC12
DELTA SIGMA
MODULATOR
TYPICAL APPLICATION
2.7V to 5.5V
TC12
V
SHDN
D
MICRO
CONTROLLER
I/O
DD
OUT
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).
PIN CONFIGURATION
SOT-23A-5*
(Top View)
V
DD
TC12CVCT
TC12NVCT
1
D
OUT
NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74)
NC
45
2
3
GNDSHDN
5
6
7
MEASUREMENT
ZONE
TELCOM SEMICONDUCTOR, INC.
8
TC12-01 11/13/96
2-31
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