PixArt Imaging Inc.
ADBS-A350 Optical Finger Navigation
Shutter_Upper
Access: Read
Address: 0x06
Reset Value: Any
7
6
5
4
3
2
1
0
Bit
S15
S14
S13
S12
S11
S10
S9
S8
Field
Shutter_Lower
Access: Read
Address: 0x07
Reset Value: Undefined
7
6
5
4
3
2
1
0
Bit
S7
S6
S5
S4
S3
S2
S1
S0
Field
Data Type: Sixteen bit unsigned integer.
USAGE: Units are clock cycles. Read Shutter_Upper first, then Shutter_Lower. They should be read consecutively. The
shutter is adjusted to keep the average and maximum pixel values within normal operating ranges. The shutter
value is automatically adjusted.
Maximum_Pixel
Access: Read
Address: 0x08
Reset Value: Any
7
6
5
4
3
2
1
0
Bit
MP7
MP6
MP5
MP4
MP3
MP2
MP1
MP0
Field
Data Type: Eight-bit number.
USAGE: Maximum Pixel value in current frame. Minimum value = 0, maximum value = 254. The maximum pixel value can
vary with every frame.
Pixel_Sum
Access: Read
Address: 0x09
Reset Value: Any
7
6
5
4
3
2
1
0
Bit
AP7
AP6
AP5
AP4
AP3
AP2
AP1
AP0
Field
Data Type: High 8 bits of an unsigned 17-bit integer.
USAGE: This register is used to find the average pixel value. It reports the seven bits of a 16-bit counter, which sums all
pixels in the current frame. It may be described as the full sum divided by 512. To find the average pixel value,
use the following formula:
Average Pixel = Register Value * 128/121 = Register Value * 1.06
The maximum register value is 240. The minimum is 0. The pixel sum value can change every frame.
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
31
PIXART [ PIXART IMAGING INC. ]
