
TC625
PRELIMINARY INFORMATION
TC625-01 5/13/97
1- WIRE DIGITAL THERMOMETER
GENERAL DESCRIPTION
The TC625 is a monolithic temperature sensor that
generates a pulse train, the high and low times of which vary
in direct proportion to the temperature of the device. This
technique allows temperature to be accurately measured by
the host microcontroller without an A/D converter, and with
only a single I/O port pin. The overall accuracy is
±
1.5
°
C
typical over the rated measurement range of – 25
°
C to
+100
°
C.
Unlike voltage output temperature sensors, the digital
output of the TC625 offers superior immunity to system
noise and does not require an A/D converter. Unlike two wire
serial temperature sensors, the TC625 communicates over
a single wire, and without serial protocol overhead.
The TC625 operates from supply voltages as low as
2.7V. Open drain (TC625N) and complimentary (TC625C)
output configurations are available. The TC625 is available
in TO-92 and SOT-23A-5 packages.
1-WIRE DIGITAL THERMOMETER
PIN CONFIGURATIONS
FEATURES
I
I
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I
I
Single Wire Interface to Host Microcontroller
High Precision .................
±
1
°
C Accuracy (Typical)
Wide Measurement Range .......... – 25
°
C to +100
°
C
No External Components Required
Complimentary (TC625C) or Open Drain Outputs
(TC625N)
Low Voltage Operation ........................2.7V to 5.5V
Small Packages ......................... TO-92, SOT-23A-5
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I
APPLICATIONS
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I
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I
I
Isolated Temperature Sensing
Environmental Control Systems
Process / Industrial Control Systems
Power System Temperature Monitoring
Process Control Systems
ORDERING INFORMATION
Part No.
Package
Output Config.
TC625CVNT
TC625CVZB
TC625NVNT
TC625NVZB
TC625EV
NOTE:
*SOT-23A-5 is equivalent to EIAJ (SC-74A).
SOT-23A-5*
TO-92-3
SOT-23A-5*
TO-92-3
Evaluation Kit for the TC625 and TC12
Complimentary
Complimentary
Open Drain
Open Drain
FUNCTIONAL BLOCK DIAGRAM
VDD
V
DOUT
D
G
GND
NOTE:
*SOT-23A-3 is equivalent
to EIAJ (SC-74A)
TC625CVNT
TC625NVNT
TC625CVZB
TC625NVZB
TO-92-3
SOT-23A-5*
(Top View)
1
1
2
3
2
3
4
5
TEMPERATURE
TO VOLTAGE
CONVERTER
DELTA SIGMA
MODULATOR
V
DD
D
OUT
TC625
TYPICAL APPLICATION
I/O
MICRO
CONTROLLER
MEASUREMENT
ZONE
2.7V to 5.5V
TC625
EVALUATION
KIT
AVAILABLE