ADNS-6000 Avago Technologies US Inc., ADNS-6000 Datasheet - Page 26

• Manufacturer Part Number: ADNS-6000
• Description: Laser Mouse Sensor
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-6000

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SQUAL
Access: Read
Data Type: Upper 8 bits of a 10-bit unsigned integer.
USAGE: SQUAL (Surface Quality) is a measure of ¼ of the number of valid features visible by the sensor in the current
frame. Use the following formula to find the total number of valid features.
Number of features = SQUAL register value *4
The maximum SQUAL register value is 169. Since small changes in the current frame can result in changes in SQUAL,
variations in SQUAL when looking at a surface are expected. The graph below shows 700 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 remains fairly high throughout the Z-height range.
Figure 27. Squal Values at 800cpi (White Paper)
Figure 28. Mean squal vs. Z (White Paper)
26
120
100
Field
80
60
40
20
90
80
70
60
50
40
30
20
10
Bit
0
0
1
-0.8
51
SQ
101
7
-0.6
7
Distance of Lens Reference Plane to Surface, Z (mm)
151
800dpi, Circle@7.5" diameter, Speed-6ips
At Z=0mm, Circle@7.5" diameter, Speed-6ips
-0.4
201
Mean SQUAL vs. Z (White Paper)
SQ
6
251
6
SQUAL Value (White Paper)
-0.2
301
Counts
Address: 0x05
Default Value: 0x00
351
SQ
0
5
5
401
0.2
451
SQ
4
501
0.4
4
551
0.6
601
SQ
3
3
651
0.8
SQ
2
2
Avg-3sigma
Avg
Avg+3sigma
SQ
1
1
SQ
0
0