FUNCTIONAL BLOCK DIAGRAM

1

2

3

V+

GND

VPTAT

TEMPERATURE

SENSOR

DIGITAL

MODULATOR

TMP03/TMP04

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

Serial Digital Output Thermometers

FEATURES

Low Cost 3-Pin Package

Modulated Serial Digital Output

Proportional to Temperature

1.5 C Accuracy (typ) from –25 C to +100 C

Specified –40 C to +100 C, Operation to 150 C

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

1

2

3

V+

GND

BOTTOM VIEW

(Not to Scale)

TMP03/TMP04

SO-8 and RU-8 (TSSOP)

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

NC = NO CONNECT

TMP03/

TMP04

NC

NC

NC

NC

V+

GND

NC

GENERAL DESCRIPTION

The TMP03/TMP04 are monolithic temperature detectors that

generate 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 tempera-

ture 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 lin-

earity. The digital output of the TMP04 is CMOS/TTL

compatible, and is easily interfaced to the serial inputs of most

popular microprocessors. 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)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2002