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PCA9548A: Device with the same I2C address on the master and slave buses

ANUSHAVAN ATANASIAN
Prodigy 10 points
Part Number: PCA9548A

I want to check if I can put a device with the same address on the master bus as on one or more slave buses. My concern is - it may create a conflict. Am I correct?

  • +1
    TI__Mastermind 25593 points

    Hey Anushavan,

    I believe that this would technically violate the I2C standard since no two device on the same bus can share the same address. I believe if they share the same address you will see conflicts, even if it's the host address vs the peripheral address. 
    Let me run this by one of our I2C experts to check is they can confirm this though.

    thanks,
    Rami

  • 0
    Guru 260930 points

    This is not possible. When you try to access the device on the slave bus, you cannot prevent the device on the master bus from answering.

    When you have multiple devices with the same address, then you have to design your circuit so that it is possible to disconnect all the devices that might be involved in a conflict. This usually means that you have to put all of them behind a switch.

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    Thanks for confirming. I appreciate your help!