20

Pixel_Sum

Address: 0x09

Access: Read

Reset Value: Undefined

Bit

7

6

5

4

3

2

1

0

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 on every

frame.

Minimum_Pixel

Address: 0x0a

Access: Read

Reset Value: Undefined

Bit

7

6

5

4

3

2

1

0

Field

Data Type:

Eight-bit number

USAGE:

Minimum Pixel value in current frame. Minimum value = 0, maximum value = 254. The minimum pixel

value can vary with every frame.

Pixel_Grab

Address: 0x0b

Access: Read/Write

Reset Value: Undefined

Bit

7

6

5

4

3

2

1

0

Field

Data Type:

Eight-bit word

USAGE:

For test purposes, the sensor will read out the contents of the pixel array, one pixel per frame. To start

a pixel grab, write anything to this register to reset the pointer to pixel 0,0. Then read the PIXRDY bit

in the Motion register. When the PIXRDY bit is set, there is valid data in this register to read out. After

the data in this register is read, the pointer will automatically increment to the next pixel. Reading may

continue indefinitely; once a complete frame’s worth of pixels has been read, PIXFIRST will be set to

high to indicate the start of the first pixel and the address pointer will start at the beginning location

again.

PixArt Imaging Inc.

Low Power LED Integrated Slim Mouse Sensor

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PixArt Imaging Inc.