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TCA9517-Q1: question about daisy chaining boards for I2C connection

Part Number: TCA9517-Q1
Other Parts Discussed in Thread: TCA9517

What is the best way to implement?

USB TO ANY > drives I2C of the TI part, this same I2C goes to another board via ribbon cable. From that board it will go to the 3rd board via another ribbon cable.

We want to talk to parts on every board by connecting USB to ANY to the 1st board

USB to any> 3.3V level. Part I2C pullup can be 1.2V or 1.8V  so we are using 1st device TCA9517.

Now the question is how to implement so that buffered and level translated I2C signal can reach 2nd and 3rd board. 

  • Matthew,

    Our applications expert has been notified of your question and will respond accordingly.

    Regards,

    Eric Hackett 

  • Hi Matthew,

    It looks like you're using the 9517 device to redrive the signal. As long as you don't tie B sides of the 9517 together, you can stack them in series. This should work as long as those ribbon cables aren't excessively long. The devices themselves do introduce some prop delays but  you should be fine at 100kHz. At 400kHz, it may depend on how long the cables are (cap loading on bus).

    Are you just checking if the set up you have would work in theory? 

    -Bobby