KAI-4021 datasheet(8/56 Pages) ONSEMI

8 / 56 page

KAI-4021 Image Sensor

www.truesenseimaging.com

Revision 1.1 PS-0014 Pg 8

Device Description

ARCHITECTURE

Figure 1: Block Diagram

There are 10 light shielded rows followed 2062 photoactive rows. The first 6 and the last 8 photoactive rows are buffer

rows giving a total of 2048 lines of image data.

In the single output mode all pixels are clocked out of the Video L output in the lower left corner of the sensor. The

first 12 empty pixels of each line do not receive charge from the vertical shift register. The next 28 pixels receive

charge from the left light-shielded edge followed by 2056 photo-sensitive pixels and finally 28 more light shielded

pixels from the right edge of the sensor. The first and last 4 photosensitive pixels are buffer pixels giving a total of

2048 pixels of image data.

In the dual output mode the clocking of the right half of the horizontal CCD is reversed. The left half of the image is

clocked out Video L and the right half of the image is clocked out Video R. Each row consists of 12 empty pixels

followed by 28 light shielded pixels followed by 1028 photosensitive pixels. When reconstructing the image, data from

Video R will have to be reversed in a line buffer and appended to the Video L data.

There are no dark reference rows at the top and 10 dark rows at the bottom of the image sensor. The 10 dark rows are

not entirely dark and so should not be used for a dark reference level. Use the 28 dark columns on the left or right side

of the image sensor as a dark reference.

Of the 28 dark columns, the first and last dark columns should not be used for determining the zero signal level. Some

light does leak into the first and last dark columns. Only use the center 26 columns of the 28 column dark reference.

2048 (H) x 2048 (H)

Active Pixels

6 Buffer Rows

10 Dark Rows

8 Buffer Rows

Pixel

1,1

Dual

Output

Video L

Video R

2048

Single

1024

KAI-4021 Datasheet(PDF) 8 Page - ON Semiconductor