40uA on Power OFF nrf52832 s223

[cavalihno]

Hello, My problem is to much current c.a. 40uA in POWER OFF mode. Below attach code:

void power_down()
{
	nrf_gpio_pin_clear(22);			// Wylacz mostek tensometryczny
	nrf_delay_ms(10);
	nrf_gpio_pin_clear(20);			// Wylacz LDO 2V5
	nrf_delay_ms(10);

	timer_disable();
	saadc_sampling_event_disable();
	sd_clock_hfclk_release();
	
	// Disable TWI ready for sleep
	NRF_TWI0->ENABLE= TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
		
	// shut down the dcdc
	sd_power_dcdc_mode_set(NRF_POWER_DCDC_DISABLE);
	
	sd_power_system_off();
}

int main(void)
{
    nrf_gpio_cfg_output(20);		// Ustaw EN LDO jako output
	nrf_gpio_pin_set(20);		// Wlacz LDO
	
	nrf_gpio_cfg_output(22);		// Ustaw mosfet jako output
	nrf_gpio_pin_set(22);		// Wlacz mostek tensometryczny
	
	nrf_gpio_cfg_input(14, NRF_GPIO_PIN_PULLUP);	// Ustaw mosfet jako input
	nrf_gpio_cfg_input(3, NRF_GPIO_PIN_PULLUP);		// Ustaw jako wejsicie INT1 z MMA8452
	nrf_gpio_cfg_input(18, NRF_GPIO_PIN_PULLUP);	// Ustaw jako wejsicie INT2 z MMA8452

	// ANT+ init
    uint32_t err_code;
    utils_setup();
    softdevice_setup();
    ant_state_indicator_init(m_ant_bpwr.channel_number, BPWR_SENS_CHANNEL_TYPE);
    simulator_setup();
    profile_setup();

	// This pin is used for waking up from System OFF and is active low, enabling sense capabilities.
    nrf_gpio_cfg_sense_input(PIN_GPIO_WAKEUP, BUTTON_PULL, NRF_GPIO_PIN_SENSE_LOW);
		
	//Enable DCDC 
	err_code = sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);
	APP_ERROR_CHECK(err_code);

    // Workaround for PAN_028 rev1.1 anomaly 22 - System: Issues with disable System OFF mechanism
    nrf_delay_ms(1);

    // TWI
    twi_init();
    //HMC5883L_init();
    //MMA8452Q_init();
		
    // SAADC
    saadc_sampling_event_init();
    saadc_init();
    saadc_sampling_event_enable();
						
    while(FORCE_SLEEP == 0)
    {
	   __SEV();
       __WFE();
	   __WFE();
    }
		
    power_down();
}

I think that any pherips is disabled... No chips connected to TWI. I would be gratefull for help.

[Wojtek]

By POWER OFF you mean code inside while loop? If so, you should use sd_app_evt_wait instead of these SEV and WFE instructions when softdevice is enabled (is it?). I don't know which softdevice You are using, though there is no S223 :? Oh ok, by power off you mean power_down function. What LFCLK src are You using?

[cavalihno]

Sorry, my mistake, I am using s223 ANT+ softdevice. No, inside the loop is only sleep until FORCE_SLEEP == 1. Then executs power_down(). Here nRF diables all pherips and go to Power OFF and now current consumption is 40uA.

[Wojtek]

Sorry I edited my above comment just after you answered - you may have missed it. I would check that code on nrf52-DK and measure the current. Maybe something else is draining power.

[cavalihno]

HFCLK - 32MHz LFCLK - 32,768 kHz

[Wojtek]

I mean if they are both crystals or what - I assume they are. There are few things that may go wrong here - hard to say without seeing code. However, I will try another blind-shot: what is inside timer_disable() function?