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TCA9545A: I2C interface selection

Anna
Intellectual 955 points
Part Number: TCA9545A
Other Parts Discussed in Thread: TCA9546A, , SN74LV4052A

Hi Dear,

We have an audio customer who wants to find an I2C interface solution. The specific requirement is that there are multiple chips with the same I2C address on a board, but the I2C interface of the master chip is not enough. It needs to be expanded. We can see that there are two types of options on the official website. Is SWITCH or HUB more suitable for the application

  • 0
    Guru 284830 points

    To be able to switch between mutiple bus segments, you need a switch or multiplexer. The TCA9545A/TCA9546A is a good choice for three or four identical devices.

    (You could also use a cheaper analog switch like the SN74LV4052A, but then you'd need separate GPIOs to control it.)

  • 0
    TI__Mastermind 27811 points

    Hey Anna,

    Will there be more than 1 device on board that needs to be enabled at any given time? If so, switches should be used in this configuration. Otherwise, if only 1 channel is enabled then you can use multiplexers. Also see this app note for further information which device to use.

    Regards,

    Jack