1- WIRE DIGITAL THERMOMETER
EVALUATION
KIT
AVAILABLE
PRELIMINARY INFORMATION
TC625
TC625
1-WIRE DIGITAL THERMOMETER
FEATURES
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Single Wire Interface to Host Microcontroller
High Precision .................
鹵
1
擄
C Accuracy (Typical)
Wide Measurement Range .......... 鈥?25
擄
C to +100
擄
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
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
鹵1.5擄C
typical over the rated measurement range of 鈥?25擄C to
+100擄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.
APPLICATIONS
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Isolated Temperature Sensing
Environmental Control Systems
Process / Industrial Control Systems
Power System Temperature Monitoring
Process Control Systems
FUNCTIONAL BLOCK DIAGRAM
ORDERING INFORMATION
TEMPERATURE
TO VOLTAGE
CONVERTER
V
DD
Part No.
TC625CVNT
TC625CVZB
TC625NVNT
TC625NVZB
Package
SOT-23A-5*
TO-92-3
SOT-23A-5*
TO-92-3
Output Config.
Complimentary
Complimentary
Open Drain
Open Drain
TC625
DELTA SIGMA
MODULATOR
TC625EV
D
OUT
Evaluation Kit for the TC625 and TC12
NOTE:
*SOT-23A-5 is equivalent to EIAJ (SC-74A).
PIN CONFIGURATIONS
SOT-23A-5*
(Top View)
TO-92-3
1 2 3
TYPICAL APPLICATION
2.7V to 5.5V
MICRO
CONTROLLER
4
5
TC625CVZB
TC625NVZB
I/O
TC625
1
TC625CVNT
TC625NVNT
2
VDD
3
DOUT
DOUT
MEASUREMENT
ZONE
GND
NOTE:
*SOT-23A-3 is equivalent
to EIAJ (SC-74A)
TC625- 01 5/13/97 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
TC625-01 5/13/97
1
GND
VDD
1
2
