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P82B96 Operation

Alber, Moon
Intellectual 720 points
Other Parts Discussed in Thread: P82B96, TCA9617B, TCA9517

Hello
I'm Alber as a FAE in Arrow Korea.
My customer will use P82B96 as I2C Buffer.
Following is their question.
Would you please give me an answer?

1. TX signal feedback in RX Buffer
 - Accoring to device architecture & application, TX output signal(TxD, SDA or SCL) connect Rx Port(RxD, SDA or SCL).
   When Sx port driving high or low from MCU, Tx Signal will go feedback to Rx port. is there any effect in Sx port?
   If possible, would you please let me know in detail?

2. Multi I2C Device on common I2C line
 - Can they use common I2C line at Sx(or Sy) Port?

3. Hot-Swap
 - Is this available using Hot-Swap?

  • 0
    Intellectual 720 points

    Hello

    Would you please give me any feedback?

  • 0
    TI__Genius 16510 points
    Hello Alber,

    My apologies for the delay. We have been out of the office on travel.

    To answer your questions
    1) Yes, you should have RX and TX together. This is ok because I2C is intended to be a bi-directional interface. There is a difference between VIL and VOL of the Sx port, so that you won't get stuck in a latch up.

    2) Your diagram is technically correct. However the P82B96 is intended to be used in pairs to help drive longer/higher capacitance cables. To do this, it has really strong pull down FETs that can drive strong loads. Most I2C slaves are unable to handle these larger currents that P82B96 is designed for.

    As such, you should only connect I2C slaves to the Sx/Sy ports of the P82B96, and the Tx/Rx ports are made to be connected to other P82B96s.

    If you are looking for normal buffering, I would suggest looking at a device designed for i2c slaves on both sides, such as the TCA9517, or TCA9617B