nRF52 low power

[Mickael]

Hello,

I would like to know what are possibilities for low power in a central device on nRF52 chip. I need to be in BLe connection mode, and be able to receive notification from peripherals. I have too a spi link available with external mcu. For the moment, I do a call to sd_app_evt_wait in the main loop. Is there something else to do for optimize consumption in my case ?

Thanks in advance

Mickael

[endnode]

Not really. If you initialize both BLE stack and SPI driver correctly they shouldn't wake up MCU from sleep while doing DMA transfer or while not doing anything and POWER ON SLEEP (invoked by WFI/WFE ARM instructions inside stack or inside your FW) is the lowest power consumption mode supported by nRF5x devices while you must maintain certain peripheral functionality (namely time keeping through RTC - without which your BLE connection dies).

[endnode]

Btw. look to the most upvoted question in the history of this forum, it fits to nRF51 but >90% of hints are applicable to nRF52 as well. You won't get any better guide than that.