AUTOMOTIVE_LIGHTS_ON_WARNING

Published:2009/7/3 3:21:00 Author:May | From:SeekIC

The SN75604, with input control logic but requiring only one supply rail, can be used in the lights on sensor and alarm driver. The device Vcc and enable inputs are connected to a voltage lead from the light switch. The direction control input is connected to a lead from the ignition switch. Only operation of the lights without the ignition will result in the alarm sounding. The beeper used in this application is an Archer 273-066 that will operate from 3 V to 28 V. At a typical 12 V level, it will produce a pulsating tone of about 95 dB at 30 cm. The alarm on current is about 12 mA when operating from a 12 V supply.



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