PixArt Imaging Inc.
PAN301A
CMOS Optical Mouse Sensor
5. Quadrature Mode
The quadrature state of the PAN301A 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. The following diagrams show the timing for positive X motion, to the right or positive
Y motion, up.
5.1 Quadrature Output Timing
X motion to the right
Y motion up
XA/YA
83.3us
83.3us
83.3us
83.3us
83.3us
83.3us
FOUR
THREE
TWO
XB/YB
XA/YA
83.3us
166.7us
XB/YB
XA/YA
250us
XB/YB
XA/YA
333.3us
ONE
XB/YB
333.3us @ 3000frames/second
Figure 6. Quadrature output timing
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.
PixArt Imaging Inc.
12
E-mail: fae_service@pixart.com.tw
V1.3, MAY. 2004
PIXART [ PIXART IMAGING INC. ]
