TMP03
Serial Digital Output Thermometers

Abstract

FUNCTIONAL BLOCK DIAGRAM
D
OUT
V+ GND
123
VPTAT
V
REF
DIGITAL
MODULATOR
TEMPERATURE
SENSOR
TMP03/04
REV. 0
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use, nor for any infringements of patents or other rights of third parties
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otherwise under any patent or patent rights of Analog Devices.
a
Serial Digital Output Thermometers
? Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FEATURES
Low Cost 3-Pin Package
Modulated Serial Digital Output
Proportional to Temperature
±1.58C Accuracy (typ) from –258C to +1008C
Specified –408C to +1008C, Operation to 1508C
Power Consumption 6.5 mW Max at 5 V
Flexible Open-Collector Output on TMP03
CMOS/TTL Compatible Output on TMP04
Low Voltage Operation (4.5 V to 7 V)
APPLICATIONS
Isolated Sensors
Environmental Control Systems
Computer Thermal Monitoring
Thermal Protection
Industrial Process Control
Power System Monitors
TMP03/TMP04*
PACKAGE TYPES AVAILABLE
TO-92
D
OUT
V+ GND
1 2 3
TMP03/04
BOTTOM VIEW
(Not to Scale)
SO-8 and RU-8 (TSSOP)
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
NC = NO CONNECT
TMP03/04
D
OUT
NC
NC
NC
NC
V+
GND
NC
GENERAL DESCRIPTION
The TMP03/TMP04 is a monolithic temperature detector that
generates a modulated serial digital output that varies in direct
proportion to the temperature of the device. An onboard sensor
generates a voltage precisely proportional to absolute temperature
which is compared to an internal voltage reference and input to a
precision digital modulator. The ratiometric encoding format of
the serial digital output is independent of the clock drift errors
common to most serial modulation techniques such as voltage-
to-frequency converters. Overall accuracy is ±1.5°C (typical)
from –25°C to +100°C, with excellent transducer linearity. The
digital output of the TMP04 is CMOS/TTL compatible, and is
easily interfaced to the serial inputs of most popular micro-
processors. The open-collector output of the TMP03 is capable
of sinking 5 mA. The TMP03 is best suited for systems requiring
isolated circuits utilizing optocouplers or isolation transformers.
The TMP03 and TMP04 are specified for operation at supply
voltages from 4.5 V to 7 V. Operating from +5 V, supply current
(unloaded) is less than 1.3 mA.
The TMP03/TMP04 are rated for operation over the –40°C to
+100°C temperature range in the low cost TO-92, SO-8, and
TSSOP-8 surface mount packages. Operation extends to
+150°C with reduced accuracy.
(continued on page 4)
*Patent pending.