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PCA9546A: Asking for the cascade PCA9546APWR design feasibility

SHH
Mastermind 30301 points
Part Number: PCA9546A

Hi Team,

Please help to check if the PCA9546APWR can be cascade as below.

Thanks,
SHH

  • 0
    TI__Genius 17225 points

    Hello SHH,

    It is possible to do this but you have to take some care in selecting the correct pull up resistor that affects  both the Effective Vol at the slave and the required rise time.  That also means you take care in the amount of capacitances are on the bus due to parasitics and the amount of slaves on each bus.  Ideally use polling for each channel and not turning on all channels at once.

    Francis Houde