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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
s
Single Wire Interface to Host Microcontroller
s
High Precision .................
1
C Accuracy (Typical)
s
Wide Measurement Range .......... 40
C to +125
C
s
No External Components Required
s
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
V
DD
D
OUT
SHDN
TC12
I/O
MICRO
CONTROLLER
MEASUREMENT
ZONE
2.7V to 5.5V
TC12
EVALUATION
KIT
AVAILABLE
PDF 
ZIP