Power consumption on custom nRF52832

[Swapnil]

Hello,

I have constructed a custom board with nRF52832 and MPU9250 on it. I have flashed the program for reading battery service, temperature service and MPU9250 readings with enabling bluetooth on my moblie. Later on I measured the current consumption of custom board using multimeter and it is showing as 18mA with 2.8V of power supply. This is the huge current consumption than expected, I think. Currently I am not able to suspect what is causing for this much of current consumption. whether the current consumption parameters which are given in product specification of nRF52832 are for just nRF52832 chip or it is for entire nRF52832 development board ? Could you please suggest what components would be causing this much of power consumption, and what should be done in order to lower this power consumption ?

[Stian Røed Hafskjold]

It's not much on the nRF52 that can draw 18mA of current. As Andrei suggests, you should try to flash code on the chip with a known current consumption for reference.

You can just flash this code:

int main(void){
    NRF_POWER->SYSTEMOFF = 1;
    for(;;){}
}

The current consumed by the chip is now about 300nA

If you still get several milliamps it must be some external components on your PCB or something wrong with the design. Maybe you can upload the schematics of your design so we can have a look at it.

[Andrei]

Maybe it's a problem with MPU9250???He can try without it....

[Stian Røed Hafskjold]

Yes, it could be! It's hard to know without any schematics or code.

[Roger Clark]

@Stian

So are you reverse engineering an existing product?

[Stian Røed Hafskjold]

Hi Roger. Sorry, I don't quite understand what you mean. Just trying to give some tips on how to narrow down the problem.

[Swapnil]

@Stian

Sorry for very late reply, I am uploading my design you can have a look on it and suggest me what might be wrong with my design. I think some components might be causing more power consumption.