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P82B96: Separately transmit SDA and SCL

Shuji Ishiwata
Mastermind 7835 points
Other Parts Discussed in Thread: P82B96

Hi Team,

I have a question about P82B96.

I am thinking about the configuration as shown in the following figure.


SCL connects directly from the master to the slave.
Connect SDA through P82B96. Can this be connected?

Also, what is the Tx / Ty VOL? Is it 1V?

Best Regards,
Ishiwata

  • 0
    TI__Guru 73271 points
    Hey Ishiwata,

    May I ask what you are trying to do with this configuration. It looks like you are trying to only buffer the SDA line but not SCL.

    To me, this configuration seems odd because Sy and Sx tied together. These two pins aren't meant to be connected to each other. You won't really get anything out of doing this.

    I need to know more about what the problem you are trying to solve is and if this device is the correct choice to solve it. From what I can see, this configuration doesn't serve a purpose.

    "Also, what is the Tx / Ty VOL? Is it 1V?"
    It is dependent on the IoL. We don't specify VoL of Tx/Ty but that side should have very strong pull down strength because it can support atleast 60mA. VoL should be very low (at 3mA) because of this, at higher IoL the VoL will be larger.

    Thanks,
    -Bobby
  • 0 in reply to BOBBY
    Mastermind 7835 points
    Hi Bobby,

    Thank you for your reply.
    I understood that I could not connect Sx and Sy.

    It is a question in addition.
    How should I set unused pins?
    Is it GND connection? Is it OPEN?

    Best Regards,
    Ishiwata
  • 0 in reply to Shuji Ishiwata
    TI__Guru 73271 points

    Hey Ishiwata,

    "How should I set unused pins?"

    unused pins that are inputs or I/O pins should be pulled up to Vcc with a pull up resistor.

    Thanks,

    -Bobby