After this was published, RPi concluded the problem was a leakage current and updated the datasheet [1]. Roughly, a tiny trickle of electricity, about 100 microamps, flows out via the pin when it shouldn't. This can raise the voltage to around 2V unless you provide a path to drain it away.<p>I've ordered one and am confident for anything I'd do it's not an issue. Usually any input I have is connected directly to the output of something else and that provides the path for the leakage current. If that isn't true, e.g. a button, then I'm using a pull-up and thus also not affected. Certain analog measurements could be affected, but again not if they have a low impedance (i.e. strong) source. The current is around 100 microamps so it's not stressing the source much.<p>It's unfortunate that this is happening in the chip that so massively improved the low power sleep states. Designs needing wake from sleep on pin change with an active high / inactive high-z signal are not going to be good. That requires a strong external pulldown and will be constantly burning those 100ish microamps. That doesn't sound like much, but it's a lot of power for being asleep.<p>Still I'm very excited for the improved CPU performance and even more RAM. Once mine arrives I'm going to see how much faster it can do some fixed point DSP than the RP2040.<p>[1] <a href="https://github.com/raspberrypi/pico-feedback/issues/401#issuecomment-2334490720">https://github.com/raspberrypi/pico-feedback/issues/401#issu...</a>