Raspberry Pi has 3.3V I2C bus without any protection against overvoltage. So, I want to add protection against an accidental 5V level on the bus. How to do it?
My two tries:
Is it OK, what is better, what there are other solutions? Does serial resistors (R1, R9) make a problem for I2C communication? What is recommended value for it?
Note. I need not a level convertor. I assume that all I2C slaves has 3.3V levels. 5V maybe on the bus only for accident.