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:

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

Thanks!

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0 tqhoang 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

Reply

0 tqhoang 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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