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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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  • 0 on Jul 21, 2018 1:45 AM

    Thanks Jason.  I'm not an electrical engineer, so your advice is much appreciated.

    It appears the READYx hookup is not appropriate for my use-case given the Nintendo Wiimote pinout.  But I believe the ENABLEx should be hooked up to the Wiimote PIN3.

    Pin Description LTC4317 PIN
    1 + 3.3V (to original source on ARM platform) Not connected
    2 SCL. I²C Serial Clock. (400 kHz) SCLOUTx
    3 Device Detection (Connected to 3.3V inside attachment connector) ENABLEx
    4 Not connected. Not connected.
    5 SDA. I²C Serial Data SDAOUTx
    6 Ground Ground
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  • 0 on Jul 21, 2018 1:45 AM

    Thanks Jason.  I'm not an electrical engineer, so your advice is much appreciated.

    It appears the READYx hookup is not appropriate for my use-case given the Nintendo Wiimote pinout.  But I believe the ENABLEx should be hooked up to the Wiimote PIN3.

    Pin Description LTC4317 PIN
    1 + 3.3V (to original source on ARM platform) Not connected
    2 SCL. I²C Serial Clock. (400 kHz) SCLOUTx
    3 Device Detection (Connected to 3.3V inside attachment connector) ENABLEx
    4 Not connected. Not connected.
    5 SDA. I²C Serial Data SDAOUTx
    6 Ground Ground
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