I have a mixed system of +5V and +3.3V logic. I have pins multiplexed between the logic systems. IMX7 @ +3.3V and Atmega32U @ +5V. I protect the IMX7 pad with a series 1K resistor and low Vf diode to +3.3V rail.
There is also a series 1K resistor on the Atmega signal to the same diode.
IMX7 pad - 1K - Diode - 1K - Atmega pad
If an ERROR occurs and both the Atmega and IMX7 are outputs, a current of 200-400uA will be injected into IMX7 pad.
I have not seen any specification for injected current in the IMX7 documentation.
Does this condition violate any IMX7 electrical specifications?
Your feedback is greatly appreciated.