FDC2214: FDC2214 detection and interference。

Part Number:FDC2214

 I use Fdc2214 in the use of detection ，can not detect the completion of the interrupt signal, How do I set the interrupt to detect the signal?

2: In FDC214 I/O  measure a only half of the sine wave, when the capacitance value increases , the amplitude of the sine wave is reduced, and even no sine signal

,if this will affect the accuracy of the measurement, ?