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When 52840 is powered by VDDH is VDD/VEXT switched when in low power mode?

When I power the 52840 from a LiPo connected to VDDH and using VDD/VEXT to power 3V3 components, when the chip is put to sleep is the output on VEXT switched off? Or do I need to add a FET switch controlled by a GPIO to turn off the 3V3 rail?

Thanks!

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  • Hi,

     

    Unfortunately not with the current design. The REG0 also supplies REG1 (the nRF52840 1.3V regulators) directly, setting REGOUT0 to 0V would basically cut the power of the entire device.

    From what I understand you would like being able to cut the line between the VDD pin and the REG0 output when needed. Currently that is not possible, I believe because it needs the decoupling caps on the VDD pins. So for the time being, if you need to cut the supply to any external circuitry being supplied by REGOUT0, you need to switch it using a GPIO unfortunately.

     

    Also I forgot to mention: For the time being, you should be aware of errata 197 and errata 202.

     

    Best regards,

    Andreas

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