High current consumption after sd_power_system_off();

[ZR7]

Hi,

I am using Nordic nRF52832. I wrote the simplest code for entering system off mode. My code does nothing except system off (see below). I built the solution, downloaded it to the target board, then disconnected the Jlink cable, and then powered cycles several times. 

I than measured current. The current was 6mA from the Nordic IC (that's 6 mili Amps, not micro amps). According to the data sheet, in System Off, the IC should consume less than 2uA. I verified that I am measuring only the current that goes to the Nordic IC and not to other ICs. 

Can you tell me what I am doing wrong?

// **************************************************************************************************************************************************
// main.c
// **************************************************************************************************************************************************


#include "nrf_log_ctrl.h"

int main(void)
 {
        sd_power_system_off();        
}

[Håkon Alseth]

Hi,

 

Try this loop:

int main(void)
{
    nrf_delay_ms(1000); // visual aid; you should see ~3-4 mA drawn before it enters systemoff.
    while(1)
    {
        NRF_POWER->SYSTEMOFF=1;
    }
}

 

Kind regards,

Håkon