PixArt Imaging Inc.

PAN101B

CMOS Optical Navigation Sensor

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PixArt Imaging Inc.

V1.4, FEB. 2003

6. Quadrature Mode

The quadrature state of the PAN101B tells 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. PAN101B support 400cpi, 800cpi, two types of resolution. The following diagrams

show the timing for positive X motion, to the right or positive Y motion, up.

6.1 Quadrature Output Timing

XA/YA

XB/YB

XA/YA

XB/YB

XA/YA

XB/YB

XA/YA

XB/YB

FOUR

FOUR

FOUR

FOUR

THREE

THREE

THREE

THREE

TWO

TWO

TWO

TWO

ONE

ONE

ONE

ONE

83.3us

83.3us

83.3us

83.3us

83.3us

83.3us

83.3us

333.3us

250us

166.7us

X motion to the right

Y motion up

333.3us @ 3000frames/second

Figure 9. Quadrature Output Timing