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TCA9509: Interfacing with TCA9517?

Gregory Duperon
Expert 6040 points
Part Number:

I have a customer with an I2C application in which either end of the bus wants to be 5V signaling but in between it needs to be 1.8V.

  1. Can two A ports of a TCA9517 at 1.8V be tied together while each of their B ports at 5V?
  2. Can the A port of a TCA9517 at 1.8V be tied to the A port of a TCA9509 also at 1.8V or would one need to swap out the TCA9509?
  3. Would something completely than what is described above me better?

  • 0
    TI__Mastermind 49270 points

    Gregory Duperon said:

    Part Number: TCA9509

    I have a customer with an I2C application in which either end of the bus wants to be 5V signaling but in between it needs to be 1.8V.

    1. Can two A ports of a TCA9517at 1.8V be tied together while each of their B ports at 5V?
      [Bobby]
      Yes, as long as the B sides are not in contact with another I2C buffer on the static voltage offset side.
    2. Can the A port of a TCA9517 at 1.8V be tied to the A port of a TCA9509 also at 1.8V or would one need to swap out the TCA9509?
      [Bobby]
      TCA9509 has its offset set on the A side so A side of TCA9509 to A side of TCA9517 is okay.
    3. Would something completely than what is described above me better? [Bobby] What you have looks like it will work.