https://devzone.nordicsemi.com/f/nordic-q-a/35309/minimizing-power-consumptionHi, I am working on a project that requires extremely low power consumption (20-50 uA) at max. We are currently consuming around 5.5mA. The project uses SPI to communicate with an accelerometer and sends the data over bluetooth to a local server.en-USTelligent Community 13Tue, 12 Jun 2018 11:52:01 GMThttps://devzone.nordicsemi.com/thread/135731?ContentTypeID=1Tue, 12 Jun 2018 11:52:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:49f45b48-6043-49e2-874a-022ad9ec957eKenneth<p>Hi,</p> <p>You will need to duty cycle the SPI transacations to be able to achieve low power yes.</p> <p>Still I think 5.5mA was very high, I assume you are not using DCDC and that you are not have any __WFE() in your code to let the CPU enter system ON idle while waiting for new SPI data?</p> <p>I would expect SPI would draw around 1.2mA with DCDC and CPU in idle. So to achieve around 50uA you would need to&nbsp;enable the SPI around only 4% of the time.</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>