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[ADV7511W] VIL(max) spec of DDC I2C line of ADV7511W.

Question asked by Tamu on Jul 11, 2018
Latest reply on Jul 13, 2018 by GuenterL

Hello,

 

I have a question about VIL(max) spec of DDCI2C line of ADV7511W.

 

About DDC I2C specification, HDMI 1.4a specification indicates that
the spec of DDC I2C requires to meat the I2C specification ver2.1.

According to I2C-bus Specification, version2.1, Section 15
VIL(max)  =  0.3VDD[V]
So when VDD=3.3V, the VIL(max) = 0.99V.

 

The Vil max of the DDC I2C line is 0.7V on the ADV7511W datasheet as follows:
VIL(max)  =  0.7[V]

 

Question:
We wants to know the reason of the difference.
Why is there a difference between the spec for DDC I2C of I2C-bus Specification version2.1 and ADV7511W datasheet?

 

Thank you!
Best regards.
Tamu

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