ADNS-2610 Avago Technologies US Inc., ADNS-2610 Datasheet - Page 21

• Manufacturer Part Number: ADNS-2610
• Description: SENSOR OPTICAL MOUSE 8-DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2610

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-1843; ADNS-2610

SQUAL
Access: Read
Data Type: Upper 8 bits of a 9-bit integer.
USAGE: SQUAL (Surface QUALity) is a measure of the number of features visible by the sensor in the current frame.
The focus point is important and could affect the SQUAL
value. Figure 32 shows another setup with various z-
heights. This graph clearly shows that the SQUAL value is
dependent on focus distance.
Note: The data is obtained by getting multiple readings
over different heights.
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Number of Features = SQUAL Register Value x 2.
The maximum value is 255. 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 when there is no surface below the sensor.
Field
Bit
SQ
7
7
SQ
6
6
Address: 0x04
Reset Value: 0x00
SQ
5
5
SQ
4
4
Figure 32. Typical Mean SQUAL vs. z
(white paper).
1.50
1.25
1.00
0.75
0.50
0.25
-1.0
0
DELTA FROM NOMINAL FOCUS (mm)
SQ
-0.6
3
3
-0.2
0.2
SQ
2
2
0.6
X
X
X
+
–
3
3
σ
σ
1.0
SQ
1
1
SQ
0
0