Periodic current during waiting event.

[talby]

Hi

I am measuring the current. I use SDK 12.2.0 , NRF52 and S132. I noticed that current was flowing even while device waits events.

Device waits by sd_app_evt_wait(). It does not advertising. It does not use app_timer and other peripheral. But it wake up periodically about every 19 ms.

Why does it wake up? Can I reduce this current? Are there parameters to check?

best regards.

[Stian Røed Hafskjold]

Hi,

These are refresh mode spikes. The chip does not wake up, it is the regulator charging up capacitors.

From the POWER chapter in the spec:

• Auto-controlled refresh modes for LDO and DC/DC regulators to maximize efficiency

The average current including these spikes should be about 2 µA (SD enabled with full RAM retension, and LFXO and RTC running)

[talby]

Thank you for your answer.