If I can make another suggestion, I would say that this information should also be listed under the " IO Voltage" headline. Now it’s listed under “More details about V11/V12 Headers”, and is easy to miss. I know that I would have probably missed that the input voltage of the ADC is different from the GPIO voltage if I just had a quick look at the documentation.
Right now the “IO Voltage” paragraph says:
RK3308 have two IO voltages, 1.8V/3.3V . For ROCK Pi S, the voltage level of GPIOs showed in the tables above are 3.3V and tolerance of those are 3.63V .
If the following could be added, I think that would clarify things:
For hardware V11 and V12, an ADC input is included. This ADC has an input voltage range of 0-1.8V.
Is there a way to contribute to the documentation pages? I would happily add that information myself if possible.