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1 Features

1? Cost-Effective Alternative to Thermistors

? Rated for full ?55°C to 130°C Range

? Available in an SC70 Package

? Predictable Curvature Error

? Suitable for Remote Applications

2 Applications

? Industrial

? HVAC

? Automotive

? Disk Drives

? Portable Medical Instruments

? Computers

? Battery Management

? Printers

? Power Supply Modules

? FAX Machines

? Mobile Phones

? Automotive

3 Description

The LMT89 device is a precision analog output

CMOS integrated-circuit temperature sensor that operates over a ?55°C to 130°C temperature range.

The power supply operating range is 2.4 V to 5.5 V.

The transfer function of LMT89 device is

predominately linear, yet has a slight predictable parabolic curvature. The accuracy of the LMT89

device, when specified to a parabolic transfer function, is typically ±1.5°C at an ambient

temperature of 30°C. The temperature error

increases linearly and reaches a maximum of ±2.5°C

at the temperature range extremes. The temperature

range is affected by the power supply voltage. At a

power supply voltage of 2.7 V to 5.5 V, the

temperature range extremes are 130°C and ?55°C.

Decreasing the power supply voltage to 2.4 V changes the negative extreme to ?30°C, while the

positive remains at 130°C.

The quiescent current of the LMT89 device is less

than 10 μA. Therefore, self-heating is less than

0.02°C in still air. Shutdown capability for the LMT89

device is intrinsic because its inherent low power consumption allows it to be powered directly from the

output of many logic gates or does not necessitate

shutdown at all.

The LMT89 device is a cost-competitive alternative to

thermistors.