Source code to achieve 1.5uA standby current

[Sridhar Jonnavittula]

Hi all,

I wanted to see this below screen shot current number on nRF52840 DK

For that I changed peripheral/blinky example main() like this but I am seeing 14uA.

/* Configure board. */
//bsp_board_init(BSP_INIT_LEDS);

NRF_POWER->RAM[0].POWERCLR = 0xFFFF;
NRF_POWER->RAM[1].POWERCLR = 0xFFFF;
NRF_POWER->RAM[2].POWERCLR = 0xFFFF;
NRF_POWER->RAM[3].POWERCLR = 0xFFFF;
NRF_POWER->RAM[4].POWERCLR = 0xFFFF;
NRF_POWER->RAM[5].POWERCLR = 0xFFFF;
NRF_POWER->RAM[6].POWERCLR = 0xFFFF;
NRF_POWER->RAM[7].POWERCLR = 0xFFFF;
NRF_POWER->RAM[8].POWERCLR = 0xFFFF;

/* Toggle LEDs. */
while (true)
{
__WFE();
#if 0
for (int i = 0; i < LEDS_NUMBER; i++)
{
bsp_board_led_invert(i);
nrf_delay_ms(500);
}
#endif
}

Can anyone please provide me the source code to achieve that 1.5uA number?

Thanks

Sridhar

[Susheel Nuguru]

I get this when i try your code on Blinky example, About 1.3uA average current

[Sridhar Jonnavittula]

Please tell me the different possible input supply hardware configurations on nRF52840 DK to achieve High voltage mode(as per below screenshot). Because I don't find any, other than J3 connector.

[Susheel Nuguru]

Not sure what you are trying to get with the MAINREGSTATUS. This is just a status register telling you which pins you have connected to. Which J3 connector are you referring to?

[Sridhar Jonnavittula]

If powered at J3 of PCA10056 DK(USB on long side labled nRF USB) and read MAINREGSTATUS, I observe A=1. 

Actually I wanted to see this below attached current number and I am not able to find any other way other than powering at J3

Please suggest if there is any other way.