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Current Injection into IMX7 nPad

Question asked by DAVID SABALESKY on Jun 25, 2019
Latest reply on Jun 26, 2019 by igorpadykov

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.