how to disable dcdc of nRF52840 in NCS v2.9.1?

[always18]

Hi:

There arenot 10uH or 15nH at my board,how can i disable the dcdc in the code?

[Einar Thorsrud]

Hi,

To disable the DCDC, modify the board file for your custom board to specify using LDO instead like this (you can also put this in an overlay file):

&reg1 {
    regulator-initial-mode = <NRF5X_REG_MODE_LDO>;
};

[always18]

hi, I added the following to the board overlay file:

&reg1 {
regulator-initial-mode = <NRF5X_REG_MODE_LDO>;
};

when i power on the board,it don't work.

and when i power on it and connected the jlink,it works well.

what's wrong?

[Håkon Alseth]

Hi,

 

I assume your design does not have an external LFCLK src?

Try setting this to enable internal 32k RC oscillator:

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

 

Kind regards,

Håkon