Single processor pin controls on/off function


Posted on Oct 8, 2012

A recent Design Idea prompted me to offer the simpler solution that I used in a recent project (Reference 1). We needed a momentary power switch with processor supervision. This supervision would allow the processor to delay a power-down request from a press of the power switch until all routines exited properly. In addition, in periods of inactivity, the processor could shut down the product to conserve battery life. The project also required a boost converter to convert two or three AA batteries to 5V.






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