Power consumption of the nRF52832 (PCA10040 and custom board)

[jrg]

Hi,

We are troubleshooting high power consumption on a custom nRF52832 board. It has taken us down to just

1. Enable RTC,

2. Setup GPIOs,

3. With and without NRF_POWER->DCDCEN |= 1;

3. Go into a sleep loop (while(1) { __WFE(); __SEV(); __WFE(); }

Confirming the power consumption on a PCA10040 still keeps us in high 15 uA, with peaks up to 60 uA at ~40 Hz.

Also, not enabling the RTC and leaving all GPIOs in default states leaves us with these weird-looking spikes.

Running the same code on a custom nRF52811 leaves at a low 3-4 uA current consumption which is very expected.

We are testing with the current measurement probes on a DK10040, and are using SDK15.30 with armgcc.

int main(void)
{
	NRF_POWER->DCDCEN |= 1;
    while (1)
    {
        __WFE();
        __SEV();
        __WFE();
    }
}

Thanks

Johan

[jrg]

Hi,

We've tested both with NFC as GPIO and as NFC

(CFLAGS += -DCONFIG_NFCT_PINS_AS_GPIOS)

Has there been any errata-fixes in newer SDK's since 15.3 that handles power consumption? Could you please share a good-working hex with us to flash the board and confirm low power consumption?

Johan