And more details on RP2350-E9 here -
https://www.hackster.io/news/a-surprise-hardware-bug-in-raspberry-pi-s-rp2350-leads-to-unexpected-pull-down-behavior-76b51ec22ede
https://types.pl/@wren6991/113020781781550559
https://www.hackster.io/news/a-surprise-hardware-bug-in-raspberry-pi-s-rp2350-leads-to-unexpected-pull-down-behavior-76b51ec22ede
https://types.pl/@wren6991/113020781781550559
Presumably the vendor never did a tape-out nor undertook comprehensive testing to verify their solution or they would have identified the issue."We didn't modify the [faulty] pad, we asked the vendor to modify their own pad," Wren explains of the source of the problem, which was traced to the analog circuitry of a particular fault tolerant (FT) pad. "There was one particular structure on the RP2040 FT pad that limited its tolerance, but on inspection the modified layout we got back was a completely different circuit. It was a bit of a blind spot for us in simulation, because the supplied simulation model obviously does not have this issue."
Statistics: Posted by hippy — Mon Aug 26, 2024 7:41 pm