We connect ADV7612's port B to a DisplayPort-to-HDMI receiver conversion chip. The conversion chip does not output the RXB_5V to the ADV7612's RXB_5V. What should be connected to ADV7612's RXB_5V? Thanks.
Per hardware guide appendix B, table 75, page 195, float RXA/B_5V and set DIS_CABLE_DET_RST = 0. I'd connect a test point to it.
In our case, both the Port A and Port B of the ADV7612 are used. The Port A is directly connected to a HDMI connector. The Port B is connected to a Displayport-to-HDMI converter chip that is connected to Displayport connector. We need Port A to detect the HDMI cable. If DIS_CABLE_DET_RST = 0, then Port A HDMI cable cannot be detected. So instead of floating RXB_5V, can we just connect RXB_5V to a local 5V power supply? What voltage range and current does the ADV7612 detect on the RXB_5V to confirm the presence of the cable? Are they from 2.0V to 5.0V with minimum 10uA current? Thanks.
You can tie RXB_5V high and monitor TMDS_CLK_B.... for activity
5V tolerant inputs have Vohmin = 2.6V so tying it to 3.3V should be sufficient. It is basically a digital input
However the HDMI 5V is usually used to power up the internal or external EDID memory. Make sure this is handled properly.
Would you confirm that the RXB_5V is not used to power anything in the ADV7612 and the RXB_5V of the ADV7612 almost source or sink no current?
I just got confirmation that RXB_5V is a digital input and does not power anything.
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