Enabling DCDC regulation with Fanstel BT840F for lower power consumption

[Yanis]

Hello !

I am using using the chip BT840F of Fanstel (based on the nrf52840) powered by an external 3.0 v battery for my beacon BLE application.

Regarding power consumption, the specifications say "You can enable DCDC converter to have lower power consumption."

This is what I have done to enable the dcdc converter but not so sure if I am doing everything right :

             1- I have put this in the prj.conf 

CONFIG_PM=y

CONFIG_PM_DEVICE=y

CONFIG_BOARD_ENABLE_DCDC=y

             2- I have put this in the Kconfig board file

config BOARD_ENABLE_DCDC

    bool "DCDC mode"

    select SOC_DCDC_NRF52X

    default yETT_WT_02_01_NRF52840

config BOARD_ENABLE_DCDC_HV

    bool "Enable High Voltage DCDC converter"

    default y

    select SOC_DCDC_NRF52X_HV

    depends on BOARD_NRF52840DK_NRF52840

It seems that ppk2 measurment shows that the current load dropped from 8 mC to 5 mC.

not sure if it is relevent to enable the DCDC_HV in my case with 3.0 v battery.

Is there anything to add to the overlay file ?

Am I doing the right configurations ?

Thanks in advance.

Kind regards,

Yanis

[runsiv]

Hi 

In NCS 2.9 they changed it from a Kconfig to the devicetree. Now you have to do like in the PR here

Regards

Runar

[Yanis]

So for 2.9.0 NCS I should add the following to the dts : 

&reg0 {

    status = "okay";

};

&reg1 {

    regulator-initial-mode = <NRF5X_REG_MODE_DCDC>;

};

What about the previous SDK versions as 2.6.1 ?

Regards,

Yanis

[runsiv]

Hi Yanis

In the earlier versions of the SDK it is enough to use the KCONFIG  

CONFIG_BOARD_ENABLE_DCDC=y 

Regards

Runar