Current consumption of the Pira Smart device is too high

[gorankecman]

After testing current consumption of the Pira Smart device, it seems that BLE + RTC are consuming ~569uA. Look for the options how to reduce power consumption of the BLE SoC - inside firmware especially but also check HW data. Measured current consumption:

1. 607uA -> EN: MDBT40 (in RESET), RTC, Battery Charger - DISABLED: LoRa, FET, no RPi
2. 569uA -> EN: MDBT40 (in RESET), RTC - DISABLED: Battery Charger, LoRa, FET, no RPi
3. 52uA -> EN: Battery Charger - DISABLED: MDBT40, RTC, LoRa, FET, no RPi

[gorankecman]

Code to put MDBT40 device in SYSTEM OFF mode:

int main(void)
{
    NRF_POWER->SYSTEMOFF=1;
    while (true) {}
}

I have tested this code on MDBT40 evaluation board (some other components present on the board) and the current consumption was ~170uA. Then I have soldered MDBT40 alone on PiRa Smart PCB without any additional component. Only needed pins were soldered -> VDD, AVDD, GND, SWCLK, SWDIO and current consumption was >1uA, which is in accordance with MDBT40 datasheet. I have tested first with PiRa Smart firmware, just to see if I get the current consumption approximately as expected, to make sure MDBT40 was soldered properly. Power consumption was in range 2mA - 5mA as expected.