Soft Power Switch

The Soft Power Switch is a passive, hard on/off switch with software feedback and control. In other words, it\'s like the on/off switch on a laptop. A simple press will turn the system on. Another press can (with MCU intervention) turn off the system. And if things go really wrong, pressing and holding the button will force a power-down. If you\'re building something with an enclosed battery and need a good power button, this is the board you need.

The Sense/Control pin can act as an output to a microcontroller indicating the state of the power button (high = not pressed, low = user in pressing power button). This can be used as an input to your firmware to begin to shut down before power is lost. Alternatively, the Sense/Control pin can be driven low by the system forcing power off via software. Additionally, the Fast Off pin can be used to immediately power down a system.

The most common use case is something like this:

* Microcontroller begins running code and checks to see if power button is still being pressed for X milliseconds.
* If not, it\'s just a tap, go back to sleep.
* If yes, power up and run normal program.

Later...

* User presses power button in normal program
* If power button is pressed for