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USB power supply and additional external power supply

Hello,

in my application I want to power the nRF52840 with USB at the VBUS pin or a 3.3V external supply at the VDD pin.

I wonder what will happen if someone plugs in both, that there is supply at VBUS and VDD?

Thank you.

Adrian

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  • Hi Adrian,

    Did you mean to use the USB lines and power the chip with an external 3.3V suply at the VDD pin at the same time?  Or do you want to connect VBUS to VDDH to power the nRF52840 in high voltage mode? I think you have to decide if you want to run the chip in normal or in high voltage mode.

    Do you have a schematic drawing of how you plan to power the nRF52840?

    Best Regards,

    Marjeris

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  • Hi Adrian,

    Did you mean to use the USB lines and power the chip with an external 3.3V suply at the VDD pin at the same time?  Or do you want to connect VBUS to VDDH to power the nRF52840 in high voltage mode? I think you have to decide if you want to run the chip in normal or in high voltage mode.

    Do you have a schematic drawing of how you plan to power the nRF52840?

    Best Regards,

    Marjeris

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