startup current nRF52810

RE: startup current nRF52810

kizhimon — Wed, 23 Jun 2021 14:21:26 GMT

Thank you

RE: startup current nRF52810

awneil — Wed, 23 Jun 2021 14:01:13 GMT

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.

RE: startup current nRF52810

kizhimon — Wed, 23 Jun 2021 13:56:24 GMT

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.

RE: startup current nRF52810

Jared — Wed, 23 Jun 2021 13:43:45 GMT

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

RE: startup current nRF52810

kizhimon — Wed, 23 Jun 2021 10:20:37 GMT

Yes, you are right

RE: startup current nRF52810

awneil — Wed, 23 Jun 2021 10:17:39 GMT

Just out of interest - Is that the ST power monitor you're using ... ?

https://www.st.com/en/evaluation-tools/x-nucleo-lpm01a.html

RE: startup current nRF52810

kizhimon — Wed, 23 Jun 2021 09:25:58 GMT

int main(void)
{
while (1)
{
idle_state_handle();
}

That's the code I am using to analyze it. Optimization level is none

RE: startup current nRF52810

awneil — Tue, 22 Jun 2021 11:38:09 GMT

What code are you running?