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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 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 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.
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FUNCTIONAL BLOCK DIAGRAM
TMP03/TMP04
TEMPERATURE SENSOR
VPTAT
DIGITAL MODULATOR
VREF
123 DOUT V+ GND
PACKAGE TYPES AVAILABLE
TO-92
TMP03/TMP04 123 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
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TMP03/TMP04–SPECIFICATIONS
TMP03F (V+ = 5 V, –40؇C ≤ TA ≤ 100؇C, unless otherwise noted.)
Parameter
Symbol
Conditions
ACCURACY Temperature Error.