nrf528333 held in reset (hardware BOD)

RE: nrf528333 held in reset (hardware BOD)

mathiaso — Mon, 15 Sep 2025 14:15:55 GMT

I see. If it's outside the recommendations, our suggestion would be to try to modify the ramp-up profile, in order to get within the recommended operating conditions.

[quote user="eb12345"]It also might stay around that 1.7V depending on the battery stage of life.[/quote]

This sounds like it might be related to the ramp-up speed. Would you be able to try removing/reducing some decoupling caps on the supply?

RE: nrf528333 held in reset (hardware BOD)

eb12345 — Fri, 12 Sep 2025 19:02:41 GMT

I don't have a plot, but I believe it might be slower to rise than the recommended operating conditions. It also might stay around that 1.7V depending on the battery stage of life. Is there a way to alleviate any of the BOD issue we're seeing ?

RE: nrf528333 held in reset (hardware BOD)

mathiaso — Fri, 12 Sep 2025 11:41:35 GMT

Do you have a plot or similar of how you ramp up the SoC? Are you within the max. supply rise time given in the recommended operating conditions?

RE: nrf528333 held in reset (hardware BOD)

mathiaso — Thu, 11 Sep 2025 11:38:26 GMT

Sorry for the delay, Eran.

I've created an internal ticket on the issue.

You don't have any measurements showing the relationship between VDD and the reset state of the device, do you?

RE: nrf528333 held in reset (hardware BOD)

eb12345 — Fri, 05 Sep 2025 15:26:44 GMT

Yes. With a lab supply I move from 3.0V and to 1.58V, then to 1.6V and it comes out of reset.

Eran

RE: nrf528333 held in reset (hardware BOD)

mathiaso — Fri, 05 Sep 2025 11:43:47 GMT

Hi, Eran.

So, if I understand you correctly, Vcc goes down to a value below the BOR voltage, it goes up to 3.0V, but still stays in the reset state. But, if you move back down below the BOR threshold voltage again, you exit the reset state? Or what voltage do you have to get up to to exit the reset state after having been below the BOR threshold voltage two times?

Best regards,
Mathias