Screenshot from the data sheet, chapter 6.1 Limit Characteristics. The relevant line is: Other pin voltage -0.3~4.1 V
https://assets.chaos.social/media_attachments/files/113/409/902/652/337/154/original/3bfd99817adf12ac.jpg
@jwildeboer Well, it links to the data sheet of the AT6558 which tells me 4.1V. Or did I miss some place where is actually says 3.3V?
But surprise: the unit does not contain an AT6558 chip at all. Instead, it's a GP-02. But that's also 3.3V.
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