nrf51822 power consumption problem

[maibi]

Dear Everyone.

Hi, I develop nrf51822 with DK PCA10028. I have been optimizing the power consumption to some extent. But now I am very confused.

I use S110 softdevice 8.0.0 and have a single uart which usually leave it in a diable state. I checked the power consumption of ~30uA. But when I looked at the various documents ( nRF51 Series Reference Manual v3.0, the Softdevice Specification document ) , I checked a lot less. (Approximately 1/10) I'm already using the power_management() function. I tried other functions __WFI(), __WEF()__SEV()__WEF(), but the results were the same.

So I did some tests. in main loop, Everything else has been removed.

1. for(;;) __WFI()

2. for(;;) __WEF()__SEV()__WEF()

3. for(;;) power_management()

The expected value is single-digit uA, but it was 30uA as before. Is this ~30uA a normal value? I know that I can use many different threads to reduce power consumption further, but I still wonder.... Is not this an abnormal value in the absence of any action? I understand if this value is situated under advertising, But the situation is not right now.

Thank you for reading the story. Please answer.

[Martijn]

WFE and WFI only put the CPU into sleep mode. And 30uA is way less than the CPU uses when it is active. So the CPU actually is in sleep mode.

The softdevice is in disabled mode? My guess is you have other peripherals active. Maybe a rtc interrupt in your application code that is causes a periodic wakeup?