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(ADV7480)HOTPLUG detect circuit

Question asked by donadona999s on Apr 19, 2017
Latest reply on May 12, 2017 by donadona999s

Hi !

 

I have some questions about ADV7480.

 

Q1)

I was checking ADV7480 eval board.

And there was no pull-up resistor.

But ADV7611 eval board has pull-up resistor.

And also ADV7611 manual says ADV7611 HPD pin is open drain type.

So I think ADV7480 HPD pin is not open drain type.

Some kind of buffer is in the pin.

Is this correct?

Or does ADV7480 HPD pin have open drain circuit?

 

Q2)

When the supply power is off to ADV7480 , can ADV7480 output HPD "H" when the HDMI connecter is connect?

I tried this with ADV7480 eval board and HPD was "H" only the supply power is ON.

 

Best regards

Kawa

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