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TCA4307: How to place this part to use

Michael Jeong1
Expert 2630 points
Part Number: TCA4307

Hello Expert,

We are considering to use this part at multiple connection.

However, we are not sure whether to place this part on both sides or one side.

Is it possible like below?

If not, could you please give me a guide?

Best Regards,

Michael

  • 0
    Guru 316640 points

    What is the actual problem you're trying to solve? Do you require hot swapping?

  • 0 in reply to Clemens Ladisch
    Expert 2630 points

    Hi Clemens,

    We don't need hot swap function.

    Also there is no issue because we don't use this part now.

    Should I only use one between master and slave? Or, I wonder if I should use one each for master and slave.

    Best Regards,

    Michael

  • 0 in reply to Michael Jeong1
    Guru 316640 points

    I²C buffers split a large bus into several smaller segments. This is typically used when the total capacitance would come near the I²C specification's limit off 400 pF. (A rough estimate is 1 pF per cm plus 10 pF per device.)

  • 0
    TI__Mastermind 47188 points

    Hi Michael,

    I am still trying to understand the reason for using this device. Do you have a block diagram you could share with us? 

    TCA4307 is a hot-swap capable buffer with stuck bus recovery. As Clemens stated, buffers help to separate the total capacitance in an I2C bus into multiple segments. If the system designer has a heavily loaded I2C bus from the connection of too many target devices + long PCB traces + large input cap, etc. then a buffer is suitable to keep underneath the 400pF parasitic bus cap limit put on by the I2C standard. 

    The TCA4307 is capable of driving two I2C segments of 400pF, making up for a total of 800pF of parasitic capacitance effectively doubling the capacity of your I2C bus. 

    Please let me know if this makes sense, and if you have any more questions, feel free to reply back to the thread. 

    Regards,

    Tyler