ADNS-2610 View Datasheet(PDF) - Avago Technologies
Part Name
Description
MFG CO.
'ADNS-2610' PDF : 27 Pages View PDF
SQUAL
Access: Read
Address: 0x04
Reset Value: 0x00
Bit
7
6
5
4
3
2
1
0
Field
SQ7
SQ6
SQ5
SQ4
SQ3
SQ2
SQ1
SQ0
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.
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.
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.
1.50
X + 3σ
1.25
X
X – 3σ
1.00
0.75
0.50
0.25
0
-1.0 -0.6 -0.2 0.2 0.6 1.0
DELTA FROM NOMINAL FOCUS (mm)
Figure 32. Typical Mean SQUAL vs. z
(white paper).
21
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