PixArt Imaging Inc.
PAN3501UI
USB Optical Mouse Sensor Single Chip
4. USB Interface
4.1 USB Command Set Description
(USB
Descriptor)
The USB HOST detect USB mouse plug-in and assigns a new unique address to the USB mouse, then ask USB
mouse device for information about the device description, configuration description, HID report description
during enumeration period. After enumeration, the USB device is transfer motion and button value to the USB
host.
Descriptor Type
Device Descriptor (18 bytes)
Configuration Descriptor (9 bytes)
Interface Descriptor (9 bytes)
Human Interface Device Descriptor
(9 bytes)
Endpoint Descriptor (7 bytes)
Byte
12
3A
00
09
Byte
01
09
01
02
04
21
05
01
01
03
05
00
7F
09
15
B1
Byte
10
00
22
00
10
81
09
29
75
81
09
75
38
00
22
Byte
01
25
00
00
01
03
02
03
01
03
30
08
95
25
95
Byte
00
00
01
01
00
04
A1
15
81
05
09
95
01
01
07
Byte
00
01
01
03
01
00
01
00
02
01
31
02
81
75
B1
Byte
00
01
04
01
22
0A
05
25
95
09
15
81
06
01
01
Byte
08
02
A0
02
48
09
01
01
01
81
06
09
95
C0
32
09
00
09
00
07
05
19
95
75
A1
25
C0
3C
01
Human Interface Device Report
Descriptor (72 bytes, 3D3B)
4.2 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 4.2.1. The other kind of data format is USB report protocol
format and sends the additional wheel movement data in the fourth byte as 4.2.2. The wheel is moved forward
the fourth byte data is 01H, the wheel is moved backward the fourth byte data is FFH, and the wheel is idle the
fourth byte data is 00H.
4.2.1 USB Boot Protocol for Legacy Operation
Byte
1
Bit
0
1
2~7
0-7
0-7
Symbol
BL
BR
NC
X0~X7
Y0~Y7
Description
1 = Left button pressed
1 = Right button pressed
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.
2
3
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.
7
PixArt Imaging Inc.
E-mail:
fae_service@pixart.com.tw
V1.0, APR. 2005
PIXART [ PIXART IMAGING INC. ]
