USB INTERFACE BUTTON VOLTAGE REFERENCE 5V POWER Z-AXIS COUNTER Z1 WHEEL Z2 VSS VDDQ. Figure 3. Block Diagram . The PAW3512DK supports X, Y, Z three axes, and L, R, M three buttons under USB mode. It is a CMOS process optical mouse sensor single chip with USB interface that serves as a non-mechanical motion estimation engine for implementing a ...