we want to connect a data line with a high voltage level (above 5 V) to P1. To keep the circuit as simple (and cheap) as possible we have the idea to use a serial resistor - to limit the current - and the protection circuit on the chip - which limits the voltage.
- Is it allowed to drive the input with a current source and let the protection circuit "adjust" the voltage?
- If yes: Wich current is allowed?
- I fond in the datasheet the value I_latch (I/O latch-up current). What is the special meaning of it (What current under which condition)?
Thanks in advance,