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Long_life_battery_powered_light_detector_alarm

2016-05-09 19:13  
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Long_life_battery_powered_light_detector_alarm
This circuit draws only 1.5μA. At this load, a 9-V alkaline battery can supply 200 mA/hours, which translates to a 15-year life (the shelf life of the battery will most likely end sooner). The circuit output latches high when light is detected. If the sensor is exposed, the output remains on until it is reset. The MAX406 operates as a comparator and as a latch by adding hysteresis externally via R4. Maxim 1992, Applications and Product Highlights, p 5-8