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PCA9543A: Enquiry on data and clock signal

Ernest Yong
Expert 4600 points
Part Number: PCA9543A

Hi Team,

May I check with you for I2C switch, are we supposed to see the data and clock on both the I2C channel 0 and I2C channel 1 or only on the channel we are accessing?

Thanks.

  • 0
    TI__Guru 73971 points

    Hi Ernest,

    The device will enable the channel based on what you write to the device. 

    If we assume the device has A1=A0=GND then the I2C address for 9543A is 0x70h

    If you want to enable channel 0 then you would send:

    0x70h (write bit set) -->0x01h //Enables channel 0

    if you want to enable channel 1 then you would send:

    0x70h (write bit set) --> 0x02h //Enables channel 1

    if you want to enable both channels:

    0x70h (write bit set) --> 0x03h //Enables both channels.

    You still need pull up resistors on the secondary channels. 

    -Bobby