adns-6030 Avago Technologies, adns-6030 Datasheet - Page 24

• Manufacturer Part Number: adns-6030
• Description: Low Power Laser Mouse Bundles - Agilent Hewlett-packard
• Manufacturer: Avago Technologies

SQUAL
Access: Read
Data Type
USAGE : SQUAL (Surface Quality) is a measure of the number of valid features visible by the
sensor in the current frame.
The maximum SQUAL register value is 127. Since small changes in the current frame can result
in
graph below shows 800 sequentially acquired SQUAL values, while a sensor was moved slowly
over white paper. SQUAL is nearly equal to zero, if there is no surface below the sensor.
SQUAL is typically maximized when the navigation surface is at the optimum distance from the
imaging lens (the nominal Z-height).
Figure 22. SQUAL Values at 800cpi (White Paper)
Figure 23. Mean SQUAL vs. Z (White Paper)
24
150
100
150
100
50
50
Field
0
Bit
1
changes in SQUAL, variations in SQUAL when looking at a surface are expected. The
1.6
51
101 151 201 251 301 351 401 451 501 551 601 651 701 751
SQ
1.8
7
: Upper 8 bits of a 9-bit unsigned integer.
7
Distance of Lens Reference Plane to Surface, Z (mm)
At Z=0mm, Circle@7.5" diameter, Speed-6ips
800dpi, Circle@7.5" diameter, Speed-6ips
2.0
Mean SQUAL vs. Z (White Paper)
SQUAL Value (White Paper)
SQ
6
6
2.2
Count
2.4
Address: 0x05
Reset Value: 0x00
SQ
5
5
2.6
2.8
SQ
4
4
3.0
SQ
3
3.2
3
SQ
2
2
Avg-3sigma
Avg+3sigma
Avg
SQ
1
1
SQ
0
0