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How to use the LTC4317 I2C address translator?

tqhoang
on Jul 19, 2018

I have an embedded board that has 2 separate I2C bus connections.  The I2C slave devices have a fixed address of 0x52, so I'm restricted to only 2 instances right now, but I would like to support up to 4.  I know I will have to make Linux driver changes to support the translated addresses, but I need advice on how to wire it up.

The I2C slave devices are Nintendo Classic controllers and have a 6-pin pinout shown here.

My questions for the LTC4317:

  1. What are the READY# and ENABLE# pins for?
  2. Do I wire up the device's 3.3V to the READY# pin?

Thanks!

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    •  Analog Employees 
    on Jul 21, 2018 12:02 AM over 2 years ago

    Hi tqhoang,

    The ENABLEx pin will disconnect the matching set of SCLOUTx and SDAOUTx. So for example if you were to hold the ENABLE1 pin low, the SCLOUT1 and SDAOUT1 would be disconnected from SCLIN and SDAIN. 

    READYx indicates that the part is ready to start doing address translation on that channel. If you intend to make use of the feature, you'll need an externally pull-up since the pin is an open drain output. 

    Regards,

    Jason 

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  • 0
    •  Analog Employees 
    on Jul 21, 2018 12:02 AM over 2 years ago

    Hi tqhoang,

    The ENABLEx pin will disconnect the matching set of SCLOUTx and SDAOUTx. So for example if you were to hold the ENABLE1 pin low, the SCLOUT1 and SDAOUT1 would be disconnected from SCLIN and SDAIN. 

    READYx indicates that the part is ready to start doing address translation on that channel. If you intend to make use of the feature, you'll need an externally pull-up since the pin is an open drain output. 

    Regards,

    Jason 

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