I compared the sleep current between SystemOFFSleep(DeepSleep) and SystemONSleep(LightSleep). The board service package is “Seeed nRF52 Boards 1.1.1”. To enter sleep mode, I used NRF_POWER->SYSTEMOFF = 1; for DeepSleep and RTOS delay() function for LightSleep.
The pppk2 was used to measure the sleep current by applying 3.6V to the BAT pad on the backside of XIAO. The measured results were 2.4uA and 5.4A, with no significant difference.
Note that the quiescent current of the 3.3V LDO is measured even when the MPU enters sleep mode.
I hope this helps those considering sleep mode!
Flash_Light_Deep_Sleep.zip (1.1 KB)