Review: HDMI Switch (TMDS442) Schematic

Appala Raju Gottipilli

Intellectual 280 points

Other Parts Discussed in Thread: TMDS442

Hi,

I have prepared schematic for HDMI Switc using "TMDS442" chip.

I have 2 HDMI sources (from my embedded boards) and 2 Sinks (LVDS-Monitor and HDMI-TV).

My requirements are as follows.

In Mode-0: Source-1 should connect to Sink-1

In Mode-2: Source-2 should connect to Sink-1

In Mode-3: Source-1 should connect to Sink-2

For above requirements, I have prepared schematic. Attached document here.

Could you please review it and provide me you suggestions/corrections.

Thanks,

Raju.

HDMI-Switch.pdf

over 13 years ago

0 Elias Villegas M. over 13 years ago

TI__Guru* 76130 points

Hello Raju,

I'm going to review the schematic and I will have an answer for tomorrow before COB.

Regards.

0 Elias Villegas M. over 13 years ago

TI__Guru* 76130 points

Raju,

I reviewed the schematic and there are no errors, just as recommendation I would place a pull-down on the unused SDA pins, Also the unused TMDS input channels can be biased by terminating to ground through a 1k resistor the complementary input of the channel and leaving the other pin floating.

Another thing is that your logic table does not match with your description of the "Modes" but that is only a "description" typo.

Regards.

0 Appala Raju Gottipilli over 13 years ago in reply to Elias Villegas M.

Intellectual 280 points

Hi Elias Villegas,

Thanks for the review and recommendations.

As per per your recommendations, I have modified schematic and attached latest schematic documentas as an attachment.

Please confirm the modifications.

Regarding Modes: Yes, there is type in description. I will use Mode-0, Mode-1 and Mod-2.

Thanks,

Raju

0 Appala Raju Gottipilli over 13 years ago in reply to Appala Raju Gottipilli

Intellectual 280 points

Missed Attachment in previous post. Please find the same here.

Thanks,

Raju.

HDMI-Switch.pdf

0 Elias Villegas M. over 13 years ago in reply to Appala Raju Gottipilli

TI__Guru* 76130 points

The changes looks correct.

Regards.

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Review: HDMI Switch (TMDS442) Schematic