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TCA9517A: About connecting multiple slave devices

arinori waki
Prodigy 180 points

Part Number: TCA9517A
Other Parts Discussed in Thread: TCA9517

In the TCA9517A data sheet, there is no solution for connecting multiple devices to the B-side slave when connecting the A-side master and the B-side slave. Is it possible to use it like that?

  • 0
    TI__Guru* 78591 points

    TCA9517 uses a static voltage offset which doesn't allow it to connect to other I2C buffers that use static voltage offsets on its own B side. (Example B side of TCA9517 cannot connect to another TCA9517 B side).

    That being said, it doesn't know or care what side the master or slave is on. You can put multiple masters or slaves on either side. The main things you need to be sure is:

    • not to connect B side to other offsets
    • you follow the recommended voltage ranges on VccA/VccB
    • All devices on B side can accept a VoL of 0.54V
    • All devices on B side can drive a VoL into the device lower than 0.45V (ViLc for TCA9517A)

    Does this explanation answer your question?

    -Bobby