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PCM5242: Will I2C become supporting 3.3V when DVDD is supplied by 3.3V?

Part Number: PCM5242


I've two questions about PCM5242

1. Will I2C become 3.3V when DVDD is supplied by 3.3V as below?

2. Should we leave GPIO floating or tie to GND if they are unused.

Thank you very much!