I want to use the mangOH Yellow (with WP7702) in an application where it’s powered by a vehicle (using some kind of regulator to bring the voltage down to 5V). When the vehicle turns off (and thus the input 5V goes away), I was envisioning that the LiPo battery could provide enough backup power to keep it alive for a couple of minutes, then shut the WP7702 down cleanly. Then, the WP7702 could power itself back on as soon as the voltage input is supplied again (e.g. the vehicle starts back up), which might be days later.
Is the hardware on the mangOH Yellow capable of doing this, or am I going to have to add additional circuitry to “disconnect” the LiPo battery after I shut down cleanly? Or, is there some kind of super low power mode that we could enter that runs off the battery and lasts for a long time, and it automatically wakes out of it when 5V comes back?
Thanks for any ideas.