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TDP158: TDP158 EDID no i2c

chunqiu lv

Intellectual 715 points

Part Number: TDP158

Hi TI Team:

Customer uses tdp158 as HDMI redriver, but there is no DDC_SCL and DDC _ SDA interface at the Customer board, Refer to "tdp158 source side application with DDC snoop mode" on page 43 of the specification for design.The current situation is as follows：

1.Customer board directly connected to HDMI monitor and HDMI display is normal

2.connected to tdp158 board with Customer board and HDMI display is Abnormal

3.Connect the tdp158 board with the computer and the HDMI display is normal

Please give me some suggestion

Thanks

CQ.LV

over 4 years ago

0 David (ASIC) Liu over 4 years ago

TI__Guru*** 139255 points

Hi CQ.LV

Would you please share customer board and TDP158 board schematic?

Thanks

David

0 chunqiu lv over 4 years ago in reply to David (ASIC) Liu

Intellectual 715 points

HI David：

Attached is schematic,Please help

Thanks

CQ.LVTDP158.pdf

0 David (ASIC) Liu over 4 years ago in reply to chunqiu lv

TI__Guru*** 139255 points

CQ

Looking at the schematic, Do the TMDS_CON_DDI2_CTRL_CLK/DATA connect to the source? What is the source DDC voltage requirement, 3.3V or 5V?

For source application, do you have the 2k pullup on the TMDS_CON_DDI2_CTRL_CLK/DATA? I would remove the caps on the TMDS_CON_DDI2_CTRL_CLK/DATA.

Thanks

David