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TMDS442 the 5V_SINK1 pin issue

Mickey Zhang
Genius 12080 points
Other Parts Discussed in Thread: TMDS442

Hi Team,

The customer is using TMDS442. Look the attachment, it is the schematic. LC_SCL pin and LC_SDA pin are added a 4.7K pull-up resistor to 3.3V on his PCB board. The schematic is not drawn. When the HDMI video signal is input to TMDS442, the 5V_PWR1(3) pin is 5V and it is normal, but  the 5V_SINK1(67) pin is 3.3V,not 5V.  I2C_WriteByte is 0x18,0x01,0x5C. 01 is the register model, 5C is the device address and 0X18 is the data.

Q1:Is  the  3.3V voltage for the 5V_SINK1 pin normal?

Q2: Is the  schematic correct?

Q3: Is IIC configuration correct?

Thanks,

Best Regards,

floor board1(1).pdf

  • 0
    TI__Mastermind 23815 points
    Hi Mickey,

    3.3V is normal in 5V_SINK, you can see this in page 8 of datasheet.
    In schematic I have wonder why you placed 100ohm resistors on HDMI data lanes?
    I2C configuration looks fine.

    5V_SINK is a power indicator output, you can use this pint to control the 5V power supply.

    Regards