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PCA9545A: Channel 0 to Channel 1 switching timing

Patrick Chen
Mastermind 8875 points

Part Number: PCA9545A

Hello

          Customer use PCA9545A to switch I2C channel 0 and Channel 1. The switch timing between Channel 0 to Channel 1 is about 100us. Has any timing specification limitation from channel 0 to channel 1? 100us has any risk? Thank you. 

BR

Patrick 

  • 0
    TI__Guru* 78531 points
    Hey Patrick,


    I2C standard has a parameter called tBUF which is the required time between a stop and start condition. For standard mode (100kHz) the minimum time is 4.7uS while fast mode (400kHz) is 1.3uS.


    Because 100us is higher than both for both speeds, waiting 100us is fine. The device only requires for a stop condition to be seen before it activates the channel(s).


    Thanks,

    -Bobby