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16-bit I2C addressing?

Doug McKenney
Prodigy 90 points
Other Parts Discussed in Thread: TCA9548A

We need more that 10 bits of address for our custom sensor chip.  We may have up to 64K of them in a system.  We'll be using a lot of TI chips - extenders, repeaters, hubs, etc.  The I2C standard only allows 7 or 10 bit addressing.  I need some ideas to enable 16-bit addressing in I2C.  Any ideas out there?

  • 0
    TI__Genius 16510 points
    Hello Doug,

    Per the I2C spec, 16-bit addressing is not allowed.

    The closest approach to having many different sensors on a bus is using a large number of switches such as the TCA9548A (possibly cascaded), to have multiple layers of the I2C tree. This is not a direct 16-bit approach, but you can enable and disable a series of switches to route to the sensors that you wish to connect to.
  • 0 in reply to Jonathan Valdez
    Prodigy 90 points

    Jonathan,

    Thanks for your help.  I appreciate it (even 4 years later!)

    Doug

  • 0 in reply to Doug McKenney
    TI__Genius 16510 points
    Yea, I realize it's late. Now that I am responsible for this forum, I am going through and answering any open questions I can, even if they were created long before I came along. At least anyone that searches online might find some use.

    If you have any future questions, please don't hesitate to post in this forum, knowing that you will get an answer.