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 .................
鹵
1
擄
C Accuracy (Typical)
Wide Measurement Range .......... 鈥?40
擄
C to +125
擄
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
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
鹵1擄C
over the rated measurement range of
鈥?40擄C to +125擄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.
2
3
4
5
6
7
APPLICATIONS
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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* 鈥?40擄C to +125擄C
SOT-23A-5* 鈥?40擄C to +125擄C
TEMPERATURE
TO VOLTAGE
CONVERTER
V
DD
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)
D
OUT
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
1
