PixArt Imaging Inc.
Track-on-Glass Laser Sensor
Shutter_Lower
Address: 0x0B
Reset Value: Undefined
Access: R
Bit
7
6
5
4
3
2
1
0
Field
S7
S6
S5
S4
S3
S2
S1
S0
Shutter_Upper
Address: 0x0C
Access: R
Reset Value: Undefined
Bit
7
6
5
4
3
2
1
0
Field
S15
S14
S13
S12
S11
S10
S9
S8
Data Type: 16-bit unsigned integer
USAGE:
Units are clock cycles of the internal oscillator (nominally 50MHz). Read Shutter_Upper first, then Shutter_
Lower. They should be read consecutively. The shutter is adjusted to keep the average pixel values within
normal operating ranges. The shutter value is checked and automatically adjusted to a new value if needed
on every frame when operating in default mode.
Shown below is a graph of 900 sequentially acquired shutter values, while the sensor was moved slowly over
white paper.
Shutter Values (White Paper) after SROM download
At Z = 2.4mm, 1100cpi, Circule@7.5” diameter, Speed = 6 ips
100
80
60
40
20
0
1
50 99 148 197 246 295 344 393 442 491 540 589 638 687 736 785 834 883
Count
Figure 20. Shutter Values (White Paper)
Mean Shutter vs Z (White Paper) after SROM download
1100cpi, Circle@7.5" diameter, Speed=6ips
300
250
200
150
100
50
Avg-3sigma
Avg
Avg+3sigma
0
- 0.8
- 0.6
- 0.4
- 0.2
0
0.2
0.4
0.6
0.8
1
Delta from Nominal Focus (mm)
Figure 21. Mean Shutter vs. Z (White Paper)
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.
PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
27
PIXART [ PIXART IMAGING INC. ]
