27

Pixel_Sum

Address: 0x06

Access: Read

Reset Value: 0x00

Data Type: High 8 bits of an unsigned 16-bit integer.

USAGE: This register is used to find the average pixel value. It reports the upper byte of a 16-bit counter which sums

all 900 pixels in the current frame. It may be described as the full sum divided by 256. To find the average pixel value,

use the following formula:

Average Pixel = Register Value * 256 / 900 = Register Value/3.51

The maximum register value is 221 (63 * 900/256 truncated to an integer). The minimum is 0. The pixel sum value

can change on every frame.

Maximum_Pixel

Address: 0x07

Access: Read

Reset Value: 0x00

Data Type: Six bit number.

USAGE: Maximum Pixel value in current frame. Minimum value = 0, maximum value = 63. The maximum pixel value

can vary with every frame.

Reserved

Address: 0x08

Reserved

Address: 0x09

Bit

7

6

5

4

3

2

1

0

Field

Bit

76

5

4

3210

Field

0

0

Figure 27. Mean squal vs. Z (white paper)

0

10

20

30

40

50

60

70

80

90

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

Mean SQUAL vs Z (White Paper)

Delta from Nominal Focus (mm)

Avg

Avg - 3sigma

Avg + 3sigma

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PixArt Imaging Inc.

PixArt Imaging Inc.