PIR interface controls AC loads

5 August 2009 Opto-Electronics

LSI/CSI has introduced the LS6506R PIR sensor interface IC, which can be used in a wall switch configuration (ie, with no neutral conductor 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 configuration for driving 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, etc.

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