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PCA9545A: Hot insertion feature of PCA9545A

Antony Fu
Expert 3345 points
Part Number: PCA9545A
Other Parts Discussed in Thread: TCA4311A

Hello team,

PCA9545 supports hot insertion, but I can't find more information about this feature, so would you like to help us check how it works? it is fine if we have some slides or note about this.

Thanks,

Antony

  • 0
    TI__Guru 62920 points

    Hi Antony,

    We are out of the office today but will try to get back to you within the next several days.

    Max

  • 0
    TI__Guru 53575 points

    Hi Antony,

    Hot Insertion for this device refers to devices connecting to downstream slave devices on SDA1-4 and SCL1-4. Because these lines will be disconnected until the master explicitly tells PCA9545A to make the connection, there will be no traffic on these lines and therefore will be able to be hot swapped without causing glitches on the connecting slave. I don't believe Hot Insertion is supported on SCL/SDA pins of PCA9545A. This differs from features offered by the Hot Swappable TCA4311A Buffer for example which supports a READY pin, idle-bus and STOP condition detection, bus pre-charge, etc. 

    Let me know if this is clear or if you have any other questions regarding the Hot Insertion functionality of PCA9545A.

    Regards,

    Eric

  • 0
    TI__Guru* 75741 points

    Hey Anthony,

    The PCA9545A (and all our I2C switches), support hot insertion in the sense that if the PCA9545A sits on the backplane, a daughtercard can be inserted and connect to the secondary channels while the channel is disabled. Since the channel is disabled, it will prevent any glitches from appearing on the backplane I2C bus.

    Also, any reason why the customer is using our PCA line up? Our TCA devices support wider Vcc ranges, better PoR limits, and use a newer process technology which typically means a more cost competitive solution than the PCA line.

    -Bobby