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Looking for clarification on hysteresis on digital one-wire pin of PGA309

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Hi, I'm using a microcontroller to communicate with the PGA309 and seeing some communicate and others not.  With a 3.3V power supply the micro transmits a '0' at ~320mV.  Now the datasheet on the bottom of pg 6 reads that the logic level '0' will be read upto a max of 20% of Vsd.   So I would think it should interpret 320mV as a '0'.

The piece I never really understood was how hysteresis (10% Vsd) affects this number.  When transitioning from a '1' to a '0', do I have in fact have to bring the IO down below 10% of Vsd?  And it will HOLD a '0' upto 20% Vsd?


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