TC625
1
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
TC625
PIN CONFIGURATIONS
FEATURES
s
Single Wire Interface to Host Microcontroller
s
High Precision .................
1
C Accuracy (Typical)
s
Wide Measurement Range .......... 25
C to +100
C
s
No External Components Required
s
Complimentary (TC625C) or Open Drain Outputs
(TC625N)
s
Low Voltage Operation ........................ 2.7V to 5.5V
s
Small Packages ......................... TO-92, SOT-23A-5
APPLICATIONS
s
Isolated Temperature Sensing
s
Environmental Control Systems
s
Process / Industrial Control Systems
s
Power System Temperature Monitoring
s
Process Control Systems
ORDERING INFORMATION
Part No.
Package
Output Config.
TC625CVNT
SOT-23A-5*
Complimentary
TC625CVZB
TO-92-3
Complimentary
TC625NVNT
SOT-23A-5*
Open Drain
TC625NVZB
TO-92-3
Open Drain
TC625EV
Evaluation Kit for the TC625 and TC12
NOTE: *SOT-23A-5 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.
FUNCTIONAL BLOCK DIAGRAM
VDD
V
DD
DOUT
D
OUT
GND
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
TC625
1- WIRE DIGITAL THERMOMETER
2
PRELIMINARY INFORMATION
TC625-01 5/12/97
Sales Offices
TelCom Semiconductor
1300 Terra Bella Avenue
P.O. Box 7267
Mountain View, CA 94039-7267
TEL: 415-968-9241
FAX: 415-967-1590
E-Mail: liter@c2smtp.telcom-semi.com
Printed in the U.S.A.
TelCom Semiconductor
Austin Product Center
9101 Burnet Rd. Suite 214
Austin, TX 78758
TEL: 512-873-7100
FAX: 512-873-8236
TelCom Semiconductor H.K. Ltd.
10 Sam Chuk Street, Ground Floor
San Po Kong, Kowloon
Hong Kong
TEL: 852-2324-0122
FAX: 852-2354-9957
PACKAGE DIMENSIONS
SOT-23A-5*
Dimensions: inches (mm)
TO-92-3
NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74A).
.071 (1.80)
.059 (1.50)
.122 (3.10)
.098 (2.50)
0.75 (1.90)
REFERENCE
.020 (0.50)
.012 (0.30)
.037 (0.95)
REFERENCE
.122 (3.10)
.106 (2.70)
.057 (1.45)
.035 (0.90)
.006 (0.15)
.000 (0.00)
.022 (0.55)
.008 (0.20)
10
MAX.
.010 (0.25)
.004 (0.09)
.105 (2.67)
.095 (2.41)
.018 (0.46)
.015 (0.38)
.135
(3.43)
MIN.
.500
(12.70)
MIN.
.210 (5.33)
.170 (4.32)
.205 (5.21)
.175 (4.45)
.165 (4.19)
.125 (3.18)
.105 (2.67)
.080 (2.03)
.055 (1.40)
.045 (1.14)
.018 (0.46)
.015 (0.38)
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