When the RIN signal is input, DS90BU948 Vos<0.96V. LCD screen is black. According to the specification, the Vos voltage should be between 1.125V~1.375V. Outside the above voltage range,
the CLK waveform is shown in diagram 1-NG:
When RIN has no input, the output voltage of CLK is normal, and the voltage waveform diagram 2:
Datasheet show：
