AN1828 Datasheet, PDF (1/17 Pages) STMicroelectronics – The document explains how to design

AN1828
APPLICATION NOTE
PIR (PASSIVE INFRARED) DETECTOR USING
ST7FLITE05/09/SUPERLITE
INTRODUCTION
The document explains how to design a low cost PIR detector (human motion detector) using
the ST7FLITE05(09) microcontroller family. The technique used is software Sigma-Delta A/D
Conversion, suitable for detecting low-frequency sensor signals. Refer to AN1827 for a de-
tailed explanation of the Sigma-Delta technique. The same concept can also be used for other
sensor applications such as:
– Security Systems.
– Automatic lighting Systems
– Automatic Door Openers
AN1828/0304
Rev. 1.0
1/17
1ddd