ADNS-9500 Avago Technologies US Inc., ADNS-9500 Datasheet - Page 28

• Manufacturer Part Number: ADNS-9500
• Description: Ultimate Gaming Laser Sensor
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-9500

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

Shutter_Upper
Access: Read Only
Data Type: 16-bit unsigned number.
USAGE: Units are clock cycles of internal oscillator (nominally 47MHz). Read Shutter_Upper first, then Shutter_Lower.
Figure 26. Shutter Values at 5000cpi (White Paper)
Figure 27. Mean Shutter vs. Z (White Paper)
28
Bit
Field
120
100
300
250
200
150
100
80
60
40
20
50
0
0
1
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. The shutter value can be set manually by disabling the AGC using the
Configuration_II register and writing to the Shutter_Maximum_Bound registers. Because the automatic frame
rate feature is related to shutter value it may also be appropriate to enable the fixed frame rate mode using
the Configuration_II register. The maximum value of the shutter is dependent upon the setting in the Shutter_
Maximum_Bound registers.
Shown below is a graph of 800 sequentially acquired shutter values, while the sensor was moved slowly over
white paper.
1.6
51 101 151 201 251 301 351 401 451 501 551 601 651 701 751
7
S
1.8
15
Distance from Lens Reference Plane to Navigation Surface, Z (mm)
2.0
At Z = 2.4mm, Circle@7.5" diameter, Speed = 6ips)
1600cpi, Circle@7.5" diameter, Speed = 6ips
6
S
14
Mean Shutter vs Z (White Paper)
2.2
Shutter Values (White Paper
2.4
Count
Address: 0x0C
Reset Value: 0x4e
5
S
13
2.6
2.8
4
S
12
3.0
3.2
3
S
11
3.4
2
S
10
Avg-3sigma
Avg
Avg+3sigma
1
S
9
0
S
8