ADNS-2051 Avago Technologies US Inc., ADNS-2051 Datasheet - Page 31

• Manufacturer Part Number: ADNS-2051
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2051

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q2072083C

31
Delta_Y
Access: Read
Data Type: Eight bit 2‘s complement number.
USAGE: Y movement is counts since last report. Absolute value is determined by
resolution. Reading clears the register.
Surface_Quality
Access: Read
The focus point is important and could affect the squal value, the graph below
showing another setup with various z-height. The graph clearly shows that the
squal count is dependent on focus distance.
Note:
This graph is obtained by getting multiple readings over different heights.
Data Type: Eight bit number.
USAGE: SQUAL is a measure of the number of features visible by the sensor in the
current frame. 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, if there is
no surface below the sensor.
256
192
128
64
0
MOTION
DELTA_Y
0
Field
Field
Bit
Bit
SQ
Y
-128
7
7
80
7
25
7
SQ
Y
-127
6
6
81
6
6
50
SQ
Y
5
5
5
5
75
SQ
Y
FE
4
4
Address: 0x04
Reset Value: 0x00
Address: 0x05
Reset Value: 0x00
-2
4
4
SQ
Y
3
3
FF
3
-1
100
3
SQUAL VALUES (WHITE PAPER)
SQ
Y
2
2
00
0
2
2
125
SQ
Y
1
+1
1
01
1
1
SQ
150
Y
0
+2
02
0
0
0
Figure 38. Typical mean squal vs. Z (white paper)
175
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-1.0 -0.8
DELTA FROM NOMINAL FOCUS (mm)
+126
7E
-0.5
200
-0.3
+127
7F
X+ 3σ
X
X – 3σ
0
0.25
225
0.5
0.75
1.0
250