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ADV7842 TEST4(N14) Purpose?

Question asked by Elastino on Nov 8, 2010
Latest reply on Nov 12, 2010 by DaveD

Hi, everyone,


What is purpose of Test4 pin in ADV7842?


Datasheet says, It should be tied to ground.

However, I left it floated by mistake.


What does this pin do?


Currently, I can't receive HDMI at all. Is this relevant to this pin?

TMDS_CLK_A_RAW shows that it couldn't detect clock switching.


ClockData Termination is applied via registers, and I can verify clock & data swing.

But, I'm not confident with TMDS level from ADV7511.

It is only about 500mVpp from 3.3V as common.



Any suggestion would be pleased.

Thank you in advance.