HD3SS215: Switching only the data lines of the HDMI signal

Roy Hsu

Part Number: HD3SS215

Hi Team,

My customer wants to switch the HDMI signal with our HD3SS215 but they are only going to switch the data lines, i.e. the DCz(p) and DCz(n) pins.

In this case, which control logic in Table 1 should they choose?

We think it should be either of the 2 upper ones (so that the DDC bus is open) but the datasheet suggests that the AUX_SEL should be kept at middle level voltage for HDMI application.

Could you please comment?

Thanks!

Roy Hsu

over 7 years ago

0 Malik Barton57 over 7 years ago

TI__Guru 64326 points

Roy,

The lower two rows for this table should be used and if DDC is not used then these pins can be left floating. However DDC should be used in order to read EDID information from the different sources or route to the different sinks.

0 Roy Hsu over 7 years ago in reply to Malik Barton57

TI__Genius 9390 points

Hi Malik,

I'd like to know more about how different settings of AUX_SEL affect the behavior of this device, i.e. what is changed internally within the device so that it works with a certain type of signal?

Could you provide some idea?

Thanks!
Roy Hsu

0 Malik Barton57 over 7 years ago in reply to Roy Hsu

TI__Guru 64326 points

Roy,

AUX_SEL just controls the internal switches of the device. The Mid setting of AUX_SEL puts the Aux and DDC switch paths independent of each other so that DDC can be used and leaving AUX floating does not impact the DDC path.

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HD3SS215: Switching only the data lines of the HDMI signal