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.