nRF52 battery consumption estimate

[Mufasa1]

Hi guys, I am trying how figure out the the devzone.nordicsemi.com/.../ works or ecuations to estimate the battery life using a central module.

My central device is battery powered and it goes from deep sleep to active each 10mins transmitting a Write to a peripher 20bytes and an indicate to the central 12bytes size. The connection time is about 50ms and the peripheral advertising interval is 20ms.

I am trying to calculate it in the following way:

RF transmitting = 8.1mA RF listening = 6mA

A average RF transmitting/reciving is 7mA per sec using DCDC enabled Sleep mode is 4uA per sec

estimate RF activity = ( 7mA x 0.05s)

Estimate Sleep mode consuption = 4uA x 3600s x 10s)

Estimate consumption = Estimate RF activity + Estimage Sleep mode consumption

Estimate Battery life = battert capacity / estimate cosumption

Is iit a correct way to estimate the battery life?

Thanks.

[Mufasa1]

Hi Hung, I use a timer to enable the RF activity after that the code goes to power_manager and it goes to sleep

[Hung Bui]

Still, it's not clear how do you wake up the chip every 10 minutes. If you use a timer to count the time, then you would need to count the timer consumption into the idle time current consumption.

[Mufasa1]

A approximate consumption for the RTC timer I am using should be around 0.1 uA. I am taking in count the whole current measure when the device is in sleep mode it is 3.95uA

[Hung Bui]

@Mufasa: Note that you should also count the 32kHz LFCLK clock current consumption in. If you use LFRC then it's max 1uA.

[Mufasa1]

I am using the LFCLCK to keep a lower current conumption