Low Power Node example application

[Dinesh]

Hi,

Greetings!

I just tried Low Power Node example application from SDK for mesh 16.0.0

It works functionally well, however I am little curious to know below point(s)

1. Will this type of application survive on CR2032 cion cell?

2. If yes then how long it will go?

Please note that here I am considering no additional hardware resources here.

Regards,

Dinesh

[Dinesh]

Hi

Greetings!

I have some updates after taking some trials

1. As our schematic having only 1 external crystal connected (32MHz), we have defined Softdevice clock configuration to 'NRF_SDH_CLOCK_LF_SRC_SYNTH'

2. With this configuration we were getting around 400 micro-ampere consumption

3. Then we tried with development board to cross-verify, there also we get the same results

4. Next we tried with 'NRF_CLOCK_LF_SRC_XTAL' on development board and we get consumption near around 5 micro-ampere

Here please guide me whether it is right that with 'NRF_SDH_CLOCK_LF_SRC_SYNTH' clock configuration, power consumption gets increased and

with 'NRF_CLOCK_LF_SRC_XTAL' configuration we get better results.

Regards,

Dinesh

[Stian Røed Hafskjold]

Yes, the NRF_SDH_CLOCK_LF_SRC_SYNTH explains the high current consumption you are seeing. It uses the HF clock to synthesize the LF clock. The run current of the HF clock including the internal clock tree is about 400 uA

[Dinesh]

Hi Stian,

Thanks for your reply.

Now I am waiting for our new board which is having 2nd crystal.

We will have trials on those boards and will then conclude on the same.

By the way if LF clock external crystal is connected and clock selection made accordingly then roughly how much current consumed in nRF52832? Is it near around 5 uA?

Thanks in advance.

-Dinesh

[Stian Røed Hafskjold]

Hi, sounds good. The average current in system ON idle mode with LFXO and RTC running is typically between 2-4 uA.

[Dinesh]

Thank you so much for such a quick reply