ADNS-9500 Avago Technologies US Inc., ADNS-9500 Datasheet - Page 26

• Manufacturer Part Number: ADNS-9500
• Description: Ultimate Gaming Laser Sensor
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-9500

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

SQUAL
Access: Read Only
Data Type: Upper 8-bits of a 10-bit unsigned integer.
USAGE: The SQUAL (Surface quality) register is a measure of the number of valid features visible by the sensor in the
Figure 24. SQUAL Values at 1600cpi (White Paper)
Figure 25. Mean SQUAL vs. Z (White Paper)
26
Bit
Field
200
150
100
140
120
100
50
80
60
40
20
0
0
1
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 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 remains fairly high throughout the Z-height range which allows illumina-
tion of most pixels in the sensor.
1.6
51 101 151 201 251 301 351 401 451 501 551 601 651 701 751
7
SQ
1.8
Distance from Lens Reference Plane to Navigation Surface (mm)
7
2.0
At Z = 2.4mm, Circle@7.5" diameter, Speed = 6ips
1600cpi, Circle@7.5" diameter, Speed = 6ips
6
SQ
Mean SQUAL Vs. Z (White Paper)
2.2
6
SQUAL Values (White Paper)
2.4
Address: 0x07
Reset Value: 0x00
Count
5
SQ
2.6
5
2.8
4
SQ
4
3.0
3.2
3
SQ
3
3.4
2
SQ
2
Avg-3sigma
Avg
Avg+3sigma
1
SQ
1
0
SQ
0