PixArt Imaging Inc.

PAW3601DH

CMOS Laser Mouse Sensor

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PixArt Imaging Inc.

V2.2, Aug. 2007

6. Quadrature Mode

The quadrature state of the mouse sensor tells the mouse controller which direction the mouse is moving in. The

output format is two channels quadrature (X and Y direction), which emulates encoder phototransistors. The

DSP generates the ∆x and ∆y relative displacement values that are converted into two channel quadrature signals.

The following diagrams show the timing for positive X motion, to the left or positive Y motion, down.

6.1 Quadrature Output Timing

XA/YA

XB/YB

XA/YA

XB/YB

XA/YA

XB/YB

XA/YA

XB/YB

FOUR

THREE

TWO

ONE

38us

38us

38us

38us

38us

38us

38us

152us

114us

76us

X motion to the left

Y motion down

152us @

6600frames/second

Figure 6. Quadrature Output Timing