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Can nRF52840 P0.09 / P0.10 be used for 115 kbps UART output?

ntennies

When nRF52840 P0.09 / P0.10 are used as GPIOs, the datasheet indicates they can be used for "low frequency I/O only". What is the frequency limit on these pins? Would it be possible to use them to drive 115 kbps UART output?

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  • +1

    Hi Nathan

    P0.09 and P0.10 are by default NFC pins in the nRF52840, but you can configure them to be GPIOs by following these instructions.

    When using these pins as normal GPIOs they are limited to a lower frequency than other GPIOs, as the loading is somewhat different on NFC pins than regular GPIOs. "Low frequency I/O only" means that the pins shouldn't be used for frequencies above 10kHz. So you'll have to use other pins for >10kHz operations.

    Best regards,

    Simon

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  • +1

    Hi Nathan

    P0.09 and P0.10 are by default NFC pins in the nRF52840, but you can configure them to be GPIOs by following these instructions.

    When using these pins as normal GPIOs they are limited to a lower frequency than other GPIOs, as the loading is somewhat different on NFC pins than regular GPIOs. "Low frequency I/O only" means that the pins shouldn't be used for frequencies above 10kHz. So you'll have to use other pins for >10kHz operations.

    Best regards,

    Simon

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