ADNS-2030 Avago Technologies US Inc., ADNS-2030 Datasheet - Page 31

• Manufacturer Part Number: ADNS-2030
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2030

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

Shutter_Lower
Access: Read
Shutter_Upper
Access: Read
Data Type: Sixteen bit word.
USAGE: Units are clock cycles; default value is 64. Read Shutter_Upper first, then Shutter_Lower. They should be read consecutively. The shutter
The focus point is important and could affect the shutter
value. Figure 40 shows another setup with various Z-
heights. This graph clearly shows that the shutter value is
dependent on focus distance. It shows average readings
over different heights.
Figure 40. Typical shutter vs. Z (white paper).
1
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
64
48
32
16
-1
is adjusted to keep the average and maximum pixel values within normal operating ranges. The shutter value may be different on every
frame. For each frame, the shutter can only change by ± 1/16 of the current value. Shown below is a graph of 250 sequentially acquired
shutter values, while the sensor was moved slowly over white paper.
0
Field
Field
0
-0.75 -0.5 -0.25 0
Bit
Bit
Distance from Nominal Focus (mm)
25
S
S
7
7
15
7
0.25 0.5 0.75
50
X
X
X
+
–
S
S
6
6
3
3
14
6
σ
σ
1
75
Address: 0x0f
Reset Value: 0x00
Address: 0x0e
Reset Value: 0x64
S
S
5
5
13
5
Shutter Values (White Paper)
100
S
S
4
4
12
125
4
150
S
S
3
3
11
3
175
S
S
2
2
10
2
200
S
S
1
1
1
9
225
S
S
0
0
250
0
8