sleep sate in zephyr

[jlz]

Issue with Zephyr software platform and sleep state for the Nordic chipset. We can see when using the power management sample code for Zephyr that it consume 300 uA in sleep sate. This measurement is only the Nordic current excluding external components run on a Nordic nRF52840 reference hardware. We need to know what we can do to reach expected floor current of 2uA in sleep sate. We also need to know when this will be supported if this is an issue in the current Zephyr software system.

[haakonsh]

Hey Johan,

What peripherals and clock sources are you using? It's probably a peripheral or clock source that is kept running. 

Do you have a scope of the current measurement waveform?

Cheers,

Håkon.

[jlz]

Yes you are right we know now that internal blocks of the ASIC are consuming current. We have disabled all of them and we can see that on a Nordic reference hardware we can go below 300uA but we still see that we are far from the 2uA that we expect it will consume. We can see ~20uA in sleep now. So what part of the system are still consuming is hard to find without your help.

[haakonsh]

A scope of the current consumption would help a ton. I do not know if this is a flat 20µA or periodic spikes in current consumption. 

[flip-flop]

Hi jlz

Did you find the solution for the problem? I'm facing the same problem on my nrf52832. Power consumption is around 300uA in sleep mode. Power off works fine (bellow 1uA).

And what do you mean by ASIC blocks? Application-specific integrated circuit?

Thank you.

[Jakub Rzeszutko]

Try this patch:

github.com/.../12259

[Hardik]

Hi Jlz,

We do facing the same issue with Sleep current issue with nRF51822.

Can you please suggest how could you achieve 20uA from 300uA?

What changes did you implement in Firmware or HArdware?

We have used only 16MHz crystal in our design and kelp 32KHz DNP. Any suggestion to disable all the block?