Current consumption in system off sleep

RE: Current consumption in system off sleep

powerup — Tue, 19 Feb 2019 04:23:16 GMT

Reduced current consumption after removing regulator!!
I did not think the regulator was always enabled.
I am going to modify the circuit.
Thank you.

RE: Current consumption in system off sleep

powerup — Tue, 19 Feb 2019 02:07:08 GMT

TPS76033 is replaced with mic5203-3.3.

Quiescent current in the datasheet is Typ: 0.01uA.
But my board still consumes 90uA.

I will remove the regulator and battery and test it with a power supply.

Do you think the firmware is OK?

RE: Current consumption in system off sleep

Stian Røed Hafskjold — Mon, 18 Feb 2019 15:17:12 GMT

The nRF52832 does not consume 80uA in system off mode, so there must be something else on your board that consumes current.

I see that the regulator you are using has a quiescent current of 90uA when the output current is 0mA: http://www.ti.com/lit/ds/slvs144d/slvs144d.pdf

RE: Current consumption in system off sleep

powerup — Mon, 18 Feb 2019 13:06:34 GMT

Hi.

I modified main as follows.

int main(void){

  //nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF);
  //NRF_POWER->SYSTEMOFF = 1;
  sleep_mode_enter();
  
  while(1){ 
    nrf_pwr_mgmt_run();
  }
}

But it also consumes 80-90uA.

My board only has nRF52832, LC and regulator.

RE: Current consumption in system off sleep

Stian Røed Hafskjold — Mon, 18 Feb 2019 12:37:36 GMT

Hi, when you put the nRF52832 to system OFF mode it consumes about 0.3 uA. If you measure 80 uA there must be something else on your custom board that consumes current.

Always include a main loop at the bottom of your main() function. Event though you put the chip to system OFF.

RE: Current consumption in system off sleep

powerup — Fri, 15 Feb 2019 05:54:20 GMT

I removed all the parts from the custom board and left only the MCU and peripheral devices.
But it also consumes 80-90uA of current.
Is there anything you need to configure in the boot loader?