ADNB-7051-EV Avago Technologies US Inc., ADNB-7051-EV Datasheet - Page 24

• Manufacturer Part Number: ADNB-7051-EV
• Description: OPT SENSOR BUNDLE SET FOR A7050
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNB-7051-EV

• Description/function: Laser Mouse Bundle
• Interface Type: SPI
• Product: Display Modules
• Touch Panel: No Touch Panel
• For Use With/related Products: ADNS-7050
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Squal
Access: Read
Data Type: Upper 8 bits of a -bit unsigned integer
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 162. 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 250 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).
24
Figure 22. SQUAL values at 800cpi (white paper).
Figure 23. Mean SQUAL vs. Z (white paper).
120
160
140
100
160
140
120
100
80
1
45
1.6
89 133 177 221 265 309 353 397 441 485 529 573 617 661 705 749 793 837 881
Distance of Lens Reference Plane to Surface,
Bit
Field
800dpi, Circle@7.5" diameter, Speed-6ips
1.8
Address: 0x05
Reset Value: 0x00
Mean SQUAL vs. Z (White Paper)
At Z = 0 mm, Circle@7.5" diameter, Speed-6ips
2
2.2
7
SQ
7
SQUAL Value (White Paper)
Z (mm)
2.4
2.6
Count
6
SQ
6
2.8
3
5
SQ
3.2
5
Avg-3sigma
Avg
Avg+3sigma
4
SQ
Avg-3sigma
Avg
Avg+3sigma
4
3
SQ
3
2
SQ
2
1
SQ
1
0
SQ
0