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P82B96: Multiple I2C Bus Buffers

Sadanori Kato
Guru 36490 points
Part Number: P82B96

Hi,

Can P82B96 be used in the following configuraion ?

Best regards,
Kato

  • 0
    TI__Mastermind 49040 points

    Hey Kato,

    The P82B96 is meant to be used in a pair and not in this kind of configuration. What I mean by this is, if each slave is on a different board and the master is also on a different board then each board needs its own P82B96 to talk to another P82B96. In this case, your master needs one as well.

    I've redrawn what I was talking about below. Please note I did not draw the pull up resistors but they do need to be there.

    Thanks,

    -Bobby

  • 0 in reply to BOBBY
    Guru 36490 points

    Hi Bobby-san,

    Thank you for your prompt reply.

    Could you please check whether the following block diagram is correct just in case ?

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Mastermind 49040 points
    Hey Kato-san,

    The configuration looks like it should work from what I can see.

    I would like to verify a few things first:

    1) what is the pull up voltage on all cases and the Vcc the slaves and master are using?

    2) are the slaves all on one board together or are they on all on different boards?

    Thanks,
    -Bobby
  • 0 in reply to BOBBY
    Guru 36490 points

    Hi Bobby-san,

    Thank you for your response.

    For Q1 and Q2, I look into this and get back to you.
    Then, I update the block diagram, so please check it again.

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    Guru 36490 points

    Hi Bobby-san,

    For Q1 and Q2, please see the following comments and give me your advice.

    Q1:
        VCCM = 3.0V ~ 5.5V
        VCCB = 12V
        VCCS = 3.0V ~ 5.5V

        Master device  VCC = 3.0V ~ 5.5V
        Slave  devices VCC = 3.0V ~ 5.5V
        * Not be fixed

    Q2:
        The master device and the slave devices are on different boards.
        In addition, there is a possibility to mount "the slave device #0 ~ #2", "the slave device #3 ~ #5", the slave device #6 ~ #8" and "the slave device #9 ~ #11"on different board.

    Best regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Guru 62910 points
    Hello Kato-san,

    Bobby is out of the office at the moment, but I have reviewed this thread and I do not see any issue with this connection. I am assuming you plan to tie the TX and RX lines within a channel together to interface over the cabling and that the Sx/Sy lines will be used to interface with the I2C buses locally on each board.

    Max
  • 0 in reply to Max Robertson
    Guru 36490 points

    Hi Max-san,

    Thank you for your support.

    I understood and will contact you if I get additional questions from our customer.

    Best regards,
    Kato