What is lowest power consumption template code for nrf52840 dongle

[Fabio]

I am a beginner trying to get a device to operate optimally under a battery. Where can I find a starter code template that would shutdown/disable everything, putting the device in its lowest power consumption profile so I can build from there? Instead of playing with disabling things, I was trying to start with everything off and enable what I need. I checked the examples in the SDK and all of them, even the power management ones, show a 6mA consumption.

[Fabio]

thank you folks. flying to denver right now. will try as soon as back

[Fabio]

Based on advice I created this simple code:

int main(void)
{

    while(true){
        __WFE();
    }

}

The measurement got way better than 6ma. It went to 0.46ma. However, this
seems still pretty high. With a 1000mah battery I would get a maximum of 63 days
(2 months) by having the CPU doing nothing. I keep hearing we can make these things
last for 2 years. for this to happen I would need to bring this down to 0.046ma,
that is 10 times less consumption. How is that possible if I am getting much more
with a sleeping CPU?

[Fabio]

I followed the additional articles and disabled Logging, disabled ALL pins and I can't seem to bring the draw to anything less than .046ma. I wonder if this is a dongle board issue and I guess this is the minimum I can get to? Do I have to start snapping hardware components off?

[Fabio]

I was using the USB to power the device when I got 460uA above. Then I decided to power the dongle through the VOUT bypassing the USB. Same code above got me 18uA. Looks like the USB/UART takes a lot of extra power to run? 

[Simon]

Take a look at the nRF52840 Product specification, under 6.35.14.1 USB Electrical Specification.

Best regards,

Simon