Designing with temperature sensors, part two: thermistors

摘要

Thermistors, which range in price from 10 cents to approxi-mately $25, find use in applications from automotive moni-toring and exhaust-emissions control to ice detection, skin sensors, blood and urine analyzers, home appliances, mobile phones, base-station laser drives, and battery-pack charging. Thermistors are either NTC (negative temperature coeffi-cient) or PTC (positive temperature coefficient). NTC thermistors best suit precision temperature measurement, and PTC devices best suit switching applications. This column focuses on NTC devices.