start-up current nRF52810

[buja]

Dear Team,

chip- nrF52810

I notice a startup current sequence existing for 26ms and the average value is 600 uA. This sequence is present when waking up from systemOFF as well. 

I would like to know if this behavior is common ? Can we avoid this power up/wake up current sequence, so that we can save some energy ?

[Stian Røed Hafskjold]

Hi, some startup current is expected, but 26ms sounds a bit long. Are you starting the LFRC clock at startup? Which SDK version are you using? I will do some measurement here to compare your result with the expected from standard SDK examples.

[buja]

Hi Sitan,

Thank you for your reply.

SDK- nRF5_SDK_17.0.2_d674dde

SD - s112_nrf52_7.2.0

2V- power supply

Code is given below 

int main(void)
{
ret_code_t err_code;
// Initialize.
log_init();
power_init();
power_management_init();
//enable_softdevice();

err_code = nrf_sdh_enable_request();
APP_ERROR_CHECK(err_code);

while(1){
idle_state_handle();
}

I believe clock is enabled in function nrf_sdh_enable_request().

#ifndef NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_SRC 1
#endif

Attaching sdk_config.h for reference.0525.sdk_config.h