PIR sensor interface ICs

18 April 2012 Analogue, Mixed Signal, LSI

Since LSI/CSI’s LS6506R PIR sensor interface IC is designed to drive a latching relay, it can be used in a wall switch configuration (no Neutral available) to enable the full AC mains cycle to be applied across any load, rendering the wall switch suitable for driving all types of resistive and inductive loads including incandescent lamps, fluorescent lamps, electronic and magnetic transformers, motors, etc.

A sister chip, the LS6507R, drives a triac in series with the load and is suitable to be used in a lower-cost wall switch configurations to drive incandescent lamp loads. For home and commercial occupancy sensor applications, the ICs can be used in wall switch configurations to manually or automatically switch loads on and off. For commercial applications, a feature is offered where the lights can be manually switched off and will remain off as long as motion is detected, allowing for uninterrupted Powerpoint presentations, for example.

Other features include five timeout selections ranging between 30 seconds and 30 minutes; three operating modes; on-chip voltage regulator; PIR sensitivity adjustment; ambient light override control; LED indication for motion detection; 50 Hz/60 Hz operation.

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