Hello,
I'm designing a custom board that integrates the RX66N microcontroller. In the board we have an I2C bus working at 5V that has to be connected to the RX66N. Do I have to adapt the 5V I2C to 3V3 for interfacing the microcontroller, or since I2C in the RX66N is located in 5V tolerant inputs and since it is an open-drain bus, could I leave at 5V?
Thanks a lot!
Hello Ane,
If the pins are 5V tolerant then you can freely connect the pull-up resistor to 5V. I used this trick even with the regular 3.3 V. The high output voltage in the last case may be limited by the internal TVS diodes. But for the 5V tolerant pins it should be fine.
Kind regards,
Sergey
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Perfect, thank you Sergey!