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Debugging custom nRF52 1.8V board with nRF52 DK

999matej999

Hi,

I am trying to make a custom board with nRF52833 chip. It need to be powered with 1.8V, because most of chips on the board are working on 1.8V. Is there any solution how to use debug out on nRF52 DK for this board working on 1.8V?

I have read that standard mosfet level shifters are slow for this use case and it is also for open drain output while the SWD is push-pull. Has anyone ever tried bidirectional voltage-level shifter TXS01018E from TI?

Or is there any cheap SWD programmer which will work with nRF Connect for VS Code? Segger JLINK programmer is very expensive for me.

Thanks.

Parents
  • +1

    Hi,

    I am trying to make a custom board with nRF52833 chip. It need to be powered with 1.8V, because most of chips on the board are working on 1.8V. Is there any solution how to use debug out on nRF52 DK for this board working on 1.8V?

    The nRF52 DK meaning the development kit that has the nRF52832 only supports 3V0. The nRF52833 and nRF52840 DKs supports programming at lower voltages if you supply the board either from LiPo or nRF_USB, as VDD can be configured by the fw. See this, and this. But we always suggest getting a Segger J-link!

    I have read that standard mosfet level shifters are slow for this use case and it is also for open drain output while the SWD is push-pull. Has anyone ever tried bidirectional voltage-level shifter TXS01018E from TI?

    I can't comment on third party products I haven't used, but I think in general using level shifters should be ok. 

    regards
    Jared 

Reply
  • +1

    Hi,

    I am trying to make a custom board with nRF52833 chip. It need to be powered with 1.8V, because most of chips on the board are working on 1.8V. Is there any solution how to use debug out on nRF52 DK for this board working on 1.8V?

    The nRF52 DK meaning the development kit that has the nRF52832 only supports 3V0. The nRF52833 and nRF52840 DKs supports programming at lower voltages if you supply the board either from LiPo or nRF_USB, as VDD can be configured by the fw. See this, and this. But we always suggest getting a Segger J-link!

    I have read that standard mosfet level shifters are slow for this use case and it is also for open drain output while the SWD is push-pull. Has anyone ever tried bidirectional voltage-level shifter TXS01018E from TI?

    I can't comment on third party products I haven't used, but I think in general using level shifters should be ok. 

    regards
    Jared 

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