weird behavior on VDD > 4.1v

[MosheSmartAmr]

HI , 

On my costume board works fine when VDD connected to ~3.6v.

it starts to behave differently when voltage is ~4.1v. (Flashing fails / SW not loading ).

my VDD_GPIO is 1.8v.

Thanks,

Moshe

[John]

You don't say what processor you are using. That said, I'll guess the nRF52840 as a starting point. According to the OPS doc I have (may be out of date), that part is only rated up to VDD of 3.9V.

[John]

My apologies. I missed your tag. Wrong part.