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P82B96: HDMI CEC signal

na na78
Guru 16770 points

Part Number: P82B96

Hi

The customer asked P82B96 can be used for HDMI CEC line.

I'm not familiar with HDMI standard.

Is it possible to use I2C buffer for CEC line?

Could you please give us your view?

 BestRegards

  • 0
    TI__Guru* 78271 points
    Hey Nana,

    I am also not famillar with CEC. I've tried to do some searches for this but have not found anything which shows physical layers or a set protocol.

    I have seen customers use this device to interface with their HDMI DDC line.

    My thoughts:
    This buffer still uses an open drain architecture for both sides.
    1) The I2C side has a static voltage offset of about 700~800mV so any device interfacing with this device needs to be able to accept ~800mV as a logic low.
    2) Devices interfacing to the I2C side of the device also should be open drain and not push pull
    3) This device is meant to be used in pairs (2 P82B96s) and is an ideal solution for cable transmission. Frequency limited to 400kHz

    If the HDMI CEC lines support (1) open drain, (2) accept 800mV as a logic low, (3) speed does need exceed 400kHz then this device should work.

    Thanks,
    -Bobby