RE: Online Power Profiler showing 2.7uA sleep

Stian Røed Hafskjold — Fri, 09 Jul 2021 12:49:26 GMT

Hi, the idle current match the numbers here: https://infocenter.nordicsemi.com/topic/ps_nrf52840/_tmp/nrf52840/autodita/CURRENT/parameters.i_sleep.html?cp=4_0_0_4_1_0_0

If you change LF clock source to LFRC in the online power profiler you should get this number:

I_{ON_RAMON_RTC}

System ON, full 256 kB RAM retention, wake on RTC (running from LFRC clock)

3.16

µA

LFXO uses a bit less current, 0.2 uA vs 0.6 uA for the LFRC, which leaves you at 2.7uA.

The sleep currents are independent of the DCDC regulator, as the DCDC regulator only kicks in when the current is above a certain threshold. In idle mode the regulator used is an LDO regulator operating in burst mode (both when DCDC is enabled and disabled). And the LDO is not dependent on voltage.

Sleep current numbers for the nRF5340 can be found here: https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/current_consumption/doc/current_consumption.html?cp=3_0_0_3_3_0_0#unique_1291094037