AN1755 Datasheet, PDF (1/7 Pages) STMicroelectronics – The goal of this application note is to present

AN1755
APPLICATION NOTE
A HIGH RESOLUTION / PRECISION THERMOMETER USING
ST7 AND NE555
INTRODUCTION
The goal of this application note is to present a realistic example of a thermometer using an
ST7 and an NE555.
The NE555 is operating in the a-stable mode. Its frequency is controlled by the resistance
changes of a NTC-thermistor. The frequency, as well as the duty cycle, are measured by the
ST7 timer. The NE555 output is connected to the timer input capture pin.
AN1755/0304
Rev. 1.0
1/7
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