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TCA9548A-Q1: cascaed connection

user3746678
Intellectual 400 points
Part Number: TCA9548A-Q1


Hi, TI Engineers,

I have a question about TCA9548A-Q1(automotive I2C Switch)as follows:

whether two TCA9548A-Q1 can be cascaded in the system？

Thankyou

  • 0
    TI__Guru 62920 points

    Hello,

    Yes, this should generally be OK.  Here are some things to watch out for:

     - The "downstream" switch would obviously need its corresponding channel on the "upstream" switch enabled.

     - The addresses should be configured to be unique since they will be sharing a common I2C bus.

     - If a large number of channels will be active, make sure the pull-up resistances are not so strong that they cause the low-level voltages to exceed the "VIL" requirements of the I2C devices on the bus.

    Out of curiosity, why not just connect both of the switch devices in parallel instead?  That may be a little more straightforward and would free up one of the channels.

    Regards,
    Max

  • 0 in reply to Miguel Robertson
    Intellectual 400 points

    Hi,Max

    Thanks for your replying to my question.

    Due to the CPU  just  has one I2C port, so whether I can connect both of the switch devices in parallel instead? (just like the figure as follows)

  • 0 in reply to user3746678
    TI__Guru 62920 points

    Yes, this connection is OK as long as the switches are configured to have unique addresses.  I2C as a protocol is intended to support multi-device buses.

    Regards,
    Max