Hi jpacl
>>The datasheet states that a standard IO pin is 5V tolerant, when Vdd is above 2.4V. Can a standard IO pin be connected to a 5V voltage rail through a 3k resistor during power up, providing a 1.6mA current source?
Can a standard IO pin, configured as an analog input, be connected to a 5V voltage rail through a 3k resistor indefinitely, providing a 1.6mA current source?
Answer: No. the max input leakage current is several uA, So it can't provide 1.6mA current. see below screenshot from Datasheet.
>>Can a standard IO pin, configured as an input, be connected to 1.6V voltage source, placing the input into an indeterminate state, the logic state of the input would not be used in this case?
Answer: No, 1.6V input is a indeterminate state, we can't use its logic state.
Thanks,
Jun Zhang
