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.

[Michal]

Hello,

I am looking into it. I hope to come back to you next week with more information.

Best regards,

Michal

[bdub94]

Great, looking forward to it!

[Michal]

Just wanted to let you know that I have checked in the documentation and I could not find anything specific mentioned about it.

I will now check that internally and get back to you.

Best regards,

Michal

[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

[bdub94]

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?