Waking from Low power mode


#1

Hello.

when the module wakes up from the Low power mode and returns to the active mode, the legato reboots and the boot sequence is the same as if it’s switched on. Is it possible to wake up the module from LPM, without new rebooting of legato? The Legato and my application should be available after waking without reboot the system.


#2

Ultra low power mode (ULPM) basically turns the system off except for a microcontroller. The microcontroller then causes the system to boot again based on a timer, an ADC reading or a GPIO transition.

There is another power state referred to as USB-SS mode where the system is in a low power state, but the application processor still retains its state. This is described a bit on page 39 of the Product Technical Specification for the WP series modules.