Based on the "system_off" example, I intend to use the RTC to wake the device up (a NRF52840) periodically every minute.
I setup the RTC with LFCLK (32KHz) to trigger a compare event as the wakeup source, and attempted to shutdown other peripherals so as to reach minimum supply.
According to the data sheet should be : System ON sleep mode, full 256 kB RAM retention, wake on RTC (running from LFRC clock) => current supply I(ON_RAMON_RTC) = 3 uA
Nevertheless, I failed to put the CPU in System ON sleep(idle-mode) , I tried the following :
pm_device_state_set(cons, PM_DEVICE_STATE_SUSPENDED); to set USB off (which I am using as console)
pm_power_state_force((struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0});
pm_power_state_force((struct pm_state_info){PM_STATE_STANDBY, 0, 0});
I monitored the supply current, none of these instructions (separately) were effective to drop the supply down.
I read Case ID: 222562 but it is not clear to me… which is the proper sequence ?
I am using nRF Connect SDK 1.8.0
