General Analog Thermometer Circuit

Published:2011/5/12 8:07:00 Author:Robert | Keyword: Analog, Thermometer | From:SeekIC

The analog thermometer circuit composed of HST1 is shown in the picture below. The HTS1 outputs current signal from its 2 foot and this foot is a high-impedance output port; but the voltage signal should output from the 3 foot and this foot is a low-impedance output port. It can use R2 to transform the current signal outputed by the sensor to be voltage signal U0, and then uses the 1.0 level 5V DC voltmeter to display the measured temperature value. When taking R2=10kΩ, the voltage temperature coefficient is 10mV/°C, the output impedance would be less than 100Ω. Just this case the output voltage-temperature (U0-T) feature curve is shown in the picture below.



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