nRF52 Timer power consumption

[Hamid]

I run the below code on nRF52DK and measure the power consumption of the chip (using nRF current measurement jumpers). The current consumption is 0.47 mA which is a lot just for a timer in my application.

1- Would you please confirm my measurement with the same code?

2- Could you please let me know a way to use the timer with 16Mhz clock source and reduce the power consumption?

Thanks.

void timer_handler(nrf_timer_event_t event_type, void * p_context) {}

int main(void)
{   
   nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;    
   nrf_drv_timer_init(&m_timer, &timer_cfg, timer_handler); 
   nrf_drv_timer_enable(&m_timer);
    
   while (1)
   {
        __WFE();
        __SEV();
        __WFE();
   }

}

[FormerMember]

Unfortunately, there is an error in the product specification, and the current consumption you measure is normal for the nRF52832..

The current consumption should be a little lower if you can use the internal 16 MHz RC oscillator instead of the external HFCLK.

[markopa]

Well, that's a surprise. I lost nearly 1 week of debugging why our app when idling consumes around 400uA and finally nailed it down to initializing the APP timer.

Is there a way we can get into sub 10uA area and keeping parts of RAM and the RTC functional ?

[FormerMember]

Is logging over UART enabled? If so, try to disable it?

 

[Haim Gaddasi]

I have the same exact problem, what did you mean 'initializing the APP timer.'? In my code the 'ret_code_t app_timer_init(void)' does not execute and the current is 398 uA.

[FormerMember]

Do you have logging enabled?

Which other peripherals are running?