AR0330 datasheet(59/77 Pages) ONSEMI

59 / 77 page

AR0330_DS Rev. U Pub. 4/15 EN

©Semiconductor Components Industries, LLC,2015.

AR0330: 1/3-Inch CMOS Digital Image Sensor

Compression

The sensor can optionally compress 12-bit data to 10-bit using A-law compression. The

compression is applied after the data pedestal has been added to the data. See Figure 1:

“Block Diagram,” on page 6.

The A-law compression is disabled by default and can be enabled by setting R0x31D0

from “0” to “1”.

Test Patterns

The AR0330 has the capability of injecting a number of test patterns into the top of the

datapath to debug the digital logic. With one of the test patterns activated, any of the

datapath functions can be enabled to exercise it in a deterministic fashion. Test patterns

are selected by Test_Pattern_Mode register (R0x3070). Only one of the test patterns can

be enabled at a given point in time by setting the Test_Pattern_Mode register according

to Table 41. When test patterns are enabled the active area will receive the value speci-

fied by the selected test pattern and the dark pixels will receive the value in Test_Pat-

tern_Green (R0x3074 and R0x3078) for green pixels, Test_Pattern_Blue (R0x3076) for

blue pixels, and Test_Pattern_Red (R0x3072) for red pixels.

Solid Color

When the color field mode is selected, the value for each pixel is determined by its color.

Green pixels will receive the value in Test_Pattern_Green, red pixels will receive the value

in Test_Pattern_Red, and blue pixels will receive the value in Test_Pattern_Blue.

Vertical Color Bars

When the vertical color bars mode is selected, a typical color bar pattern will be sent

through the digital pipeline.

Table 40:

A-Law Compression Table for 12-10 bits

Input Range

Input Values

Compressed Codeword

0 to 127

128 to 255

256 to 511

512 to 1023

1024 to 2047

2048 to 4095

Table 41:

Test Pattern Modes

Test_Pattern_Mode

Test Pattern Output

No test pattern (normal operation)

Solid Color

100% Vertical Color Bars

Fade-to-Gray Vertical Color Bars

256

Walking 1s test pattern (12-bit)

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