startup current nRF52810

[kizhimon]

Hi,

SDK 17.0.2

I notice a startup current sequence (shown below) which is consuming around 8.3 uJ. I would like to know what operation on startup is causing this surge ?

  

[Jared]

Hi,

The first spike is the charging of the decoupling capacitors on VDD during startup when the voltage goes from 0V to VDD. The second spike is the CPU executing the startup code.

regards

Jared 

[kizhimon]

Thank you for your answer.

My mcu will be switching on and off too often, I would like to know if there is a way to reduce this spike.

[awneil]

The decoupling capacitors should remain charged - so that peak should not recur.

Remember to choose low-leakage capacitors.

There is always a tradeoff between putting a processor more deeply to "sleep" and the time & energy it then takes to wake it up again; this applies to any system - not just nRF.

[kizhimon]

Thank you