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What is the function of the V_logic pin on the AD5593R?

Question asked by dgarnier on Dec 16, 2015
Latest reply on Dec 18, 2015 by dgarnier

I've read the datasheet several times, and I still can't figure it out.  Is this pin an input or an output?  Seems to me it should be an input to give the comparison voltage for the I2C communication.  However, it seems to act as an output.  I consistently see its voltage as 4.5V when the Vdd input is 5V.

 

If I want to use 3.3V for I2C.. should I just leave it disconnected and hope the SDA and SCL are close enough?  I really don't want to have to level shift.... or is there something I am missing?

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