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?