AN1755 datasheet(1/7 Pages) STMICROELECTRONICS

Part #	AN1755

Description	The goal of this application note is to present

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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AN1755/0304

1/7

Rev. 1.0

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.

1

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