PixArt Imaging Inc.
PAW3502
USB Optical Mouse Sensor Single Chip
5.2 USB Data Report Format
The USB report has two data formats, depending on boot or report protocol is selected. One kind of data format
is the boot protocol used in legacy environment as 5.2.1. The other kind of data format is USB report protocol
format which includes Z-wheel movement data in the fourth byte as 5.2.2. The Z-wheel is moved forward the
fourth byte data is 01H, the Z-wheel is moved backward the fourth byte data is FFH, and the Z-wheel is idle the
fourth byte data is 00H.
5.2.1 USB Boot Protocol for Legacy Operation
Byte
Bit
0
1
Symbol Description
BL
BR
BM
NC
1 = Left button pressed
1 = Right button pressed
1 = Middle button pressed
Reserved
1
2
3 ~ 7
X data (D0 - D7). A positive value indicates motion to the right; a negative value
indicates motion to the left. Bit 0 = LSB.
Y data (D0 - D7). A positive value indicates device motion upward; a negative
value indicates motion downward. Bit 0 = LSB.
2
3
0 - 7
0 - 7
X0 ~ X7
Y0 ~ Y7
5.2.2 USB Report Protocol
Byte
Bit
Symbol Description
0
1
2
BL
BR
BM
B4
1 = Left button pressed
1 = Right button pressed
1 = Middle button pressed
Reserved
1
3
4
B5
Reserved
5 ~ 7
NC
Reserved
X data (D0 - D7). A positive value indicates motion to the right; a negative value
indicates motion to the left. Bit 0 = LSB.
Y data (D0 - D7). A positive value indicates device motion upward; a negative
value indicates motion downward. Bit 0 = LSB.
Z-wheel motion data (D0 - D7). A positive value indicates device motion
2
3
0 - 7
0 - 7
X0 ~ X7
Y0 ~ Y7
4
0 - 7
Z0 ~ Z7 downward; a negative value indicates motion upward. The Z0 - Z7 limit value is
±7. Bit 0 = LSB.
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PixArt Imaging Inc.
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E-mail: fae_service@pixart.com.tw
V0.2 Dec. 2006
PIXART [ PIXART IMAGING INC. ]
