NRF52832 system on mode current consumption reduction

[man]

Hello NRF ,

I have used NRF52832 with BLE advertise and  peripherals connected on two different  I2Cs ( temp sensor and gyro sensor ), One SPI( LCD Display ) , three GPIO Interrupt and one PWM (buzzer ) .

I have used SYSTEM ON mode for sleep since my RTC Counter should be always running  which gives me my current time , hence I can not use SYSTEM OFF mode .

After measuring SYTEM ON mode current , it comes around 1.6mA  . How do I reduce this current consumption below 500uA ??

below is how I have called SYSTEM ON mode sleep ,

if(perform_sleep)

{

while(!wakeup_button)

{

if (NRF_LOG_PROCESS() == false )
{
nrf_pwr_mgmt_run();
}

}

}

where , wakeup button is and variable updated by gpio interrupt callback .

Note : I am also turning off ble advertisement before I call SYSTEM ON mode .

[Edvin]

Hello,

Is the measured current also including the LCD display and the PWM buzzer?

Do you use the softdevice? Are you scanning/advertising/in a connection?

BR,

Edvin

[man]

Edvin said:

Is the measured current also including the LCD display and the PWM buzzer?

- yes .

Edvin said:

Do you use the softdevice?

-Yes.

Edvin said:

Are you scanning/advertising/in a connection?

- Yes.

[man]

Edvin said:

I think you need to take a step back.

le me check with this 

[man]

Hello ,

After putting my lcd and temp sensor , the current reduced to 0.5mA ( 500uA) but still its more than require .

FYI , if I disable ( removed accel i2c functions )accel sensor which is on I2C then further I can reduced to 0.1mA ( 100uA ) .

[man]

I have followed below link and now I am able to get 100uA   , but how do I reconfigure my I2C ?

infocenter.nordicsemi.com/index.jsp

I2C fails during re-configuration 

[man]

Got the solution for this .

We need to unit the i2c with  nrf_drv_twi_uninit and then power off the peripheral by following above steps , to reconfigure again , nrf_drv_twi_init .

Current consumption is 100uA now after putting all  peripherals into sleep , is there anything that can be look into  to further power reduction ??? 

[Edvin]

man said:

Current consumption is 100uA now after putting all  peripherals into sleep

 It is still a bit high if you are doing nothing (only system on mode).

What is running in your application? Are there any timers? Softdevice activity? Logging? 

What HW are you using? An nRF52832 DK from Nordic? Or third party device? How do you measure the current consumption? Are you using the Power Profiler Kit?

BR,

Edvin