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TMP04

Serial Digital Output Thermometers

Analog Devices 

a

Serial Digital Output Thermometers

TMP03/TMP04

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

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)

FUNCTIONAL BLOCK DIAGRAM

TMP03/TMP04

TEMPERATURE

SENSOR

VPTAT

DIGITAL

MODULATOR

VREF

1

2

3

DOUT

V+

GND

PACKAGE TYPES AVAILABLE

TO-92

TMP03/TMP04

1

2

3

DOUT V+ GND

BOTTOM VIEW

(Not to Scale)

SO-8

DOUT 1

V+ 2

TMP03/

TMP04

8 NC

7 NC

GND 3 TOP VIEW 6 NC

(Not to Scale)

NC 4

5 NC

NC = NO CONNECT

Rev. B

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