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TCA9544A: Looking for 4 to 1 MUX of I2C

Mark Chen52
Genius 9405 points

Part Number: TCA9544A

Hi Team,

could you help to suggest solution of 4 to 1 I2C MUX?

BR,

Mark Chen

 

  • 0
    TI__Guru 74922 points

    Mark,

    I see you linked the TCA9544A, which is a 4-channel I2C mux. Is there a reason this device wouldn't work?

    Regards,

  • 0 in reply to Eric Hackett
    TI__Genius 9405 points
    Eric,

    pls correct me I have any missing understanding, TCA9544A should be 1 to 4 channel I2C switch, which function show that is bi-direction, I think TCA9544A also can support 4 to 1 I2C communicate, but i don't know how to select channel from input 4 channel to output 1 when work on 4 to 1 ?

    BR,
    Mark Chen
  • 0 in reply to Mark Chen52
    TI__Guru 74922 points
    Mark,

    Technically this device can be used in the way you want, since I2C is bidirectional. However, the side with 1 device would still need to initiate the communication every time one of the 4 devices needs to communicate. The master side is ultimate what enables one of the 4 muxed channels to communicate. So in order for this to work, the INT on the slave side would have to be engaged, then the master side would have to send communication to engage the channel, and then the slave channel could communicate.

    Does this make sense?

    Regards,