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Q: I2C supply voltage, DVDD of TPA2051D3
Could the DVDD and the I2C supply voltage be different for TPA2051?
A: Re: I2C supply voltage, DVDD of TPA2051D3
DVDD and I2C supply voltages can be different, but there are some conditions:
1) DVDD must be less than or equal to the system SDA/SCL VIH. In other words, the second case you stated does not work.
2) The I2C supply voltage must be less than the Abs max rating for SDA and SCL (3.6V for TPA2051) and less than PVDD. So if PVDD =3V, I2C Supply must be less than 3V.
Please see page 20 of the TPA2051D3 datasheet for more information.
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