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Recommendation for RESET Pin Connections for nPM2100 with nRF54L15

bdub94

I plan on using the nPM2100 to power the nRF54L15. I'd like to confirm any recommended practices for using the reset pin of the nPM2100. 

  1. nPM2100 PG/RESET to nRF54L15 nRESET Connection
    Do you recommend connecting the PG/RESET pin directly to the nRESET pin on the nRF54L15 in typical designs? I understand the PG/RESET pin has multiple functions. I suppose in this arrangement it'd mainly be used for the hard reset functionality and the watchdog timeout functionality.

  2. Capacitor on nRF54L15 nRESET Pin
    If I do connect the pins, are there any concerns with placing a small capacitor, say 10nF, on the nRESET line? I've typically done this for my nRF52832 designs.

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  • 0 in reply to Michal

    Hello again.

    nPM2100 PG/RESET to nRF54L15 nRESET Connection
    Do you recommend connecting the PG/RESET pin directly to the nRESET pin on the nRF54L15 in typical designs? I understand the PG/RESET pin has multiple functions. I suppose in this arrangement it'd mainly be used for the hard reset functionality and the watchdog timeout functionality.

    Yes, that is what we recommend in the Application chapter of the datasheet.

    Capacitor on nRF54L15 nRESET Pin
    If I do connect the pins, are there any concerns with placing a small capacitor, say 10nF, on the nRESET line? I've typically done this for my nRF52832 designs.

    I got informed that there are no concerns with that. The pull-up resistor of PG/RESET is 60 kohm, so the capacitor will slightly affect the rise time of the signal.

    Best regards,

    Michal

  • 0 in reply to Michal

    Thanks Michal.
    Looking at the figure, the PG/RESET on the nPM2100 is connected to "P0.XX" on the nRF5x. I would've assumed that "P0.XX" refers to a GPIO pin rather than the nREST pin.
    Can you confirm?

  • 0 in reply to bdub94

    I got a confirmation internally. I guess it's marked like this, since nRESET pin can have different number depending on the MCU.

    Best regards,

    Michal

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