PAS5101CS Specification

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PixArt Imaging Inc.

v1.0 2005/4/27

3.

Block Diagram & Function Description

3.1. Block Diagram

Figure 3.1 Shows the PAS5101CS sensor block diagram

The PAS5101CS is a 1/3” CMOS imaging sensor with 1280 ( H ) x 1024 ( V ) physical pixels. The active

region of sensor array is 1288 ( H ) x 1032 ( V ) as shown in Figure 3.1. The sensor array is cover with

Bayer pattern color filters and μ-lens. The first pixel location ( 0,0 ) is programmable in 2 direction ( X

and Y ) and the default value is at the left-down side of sensor array.

After a programmable exposure time, the image is sampled first with CDS ( Correlated Double Sampling )

block to improve S/N ration and reduce fixed pattern noise.

Three analog gain stages are implemented before signal transferred by the 10-bits A/D converter. The

front gain stage ( FG ) can be programmed to fit the saturation level of sensor to the full-range input of

ADC. The programmable color gain stage ( CG ) is used to balance the luminance response difference

between B/G/R. The global gain stage ( GG ) is programmed to adapt the gain to the image luminance.

The fine gained signal will be digitized by the on-chip 10-bits A/D converter. After the image data has

been digitized, further alteration to the signal can be applied before the data is output.

3.2. Defect Compensation

The defect compensation block can detect the possible defect pixel and replace it with average output of

like-colored pixels on either side of defective pixel. There is no limitation in the capability of defect

number. This function is also Enable / Disable by user.

3.3. Companding Curves

The companding function is used to simulate the gamma curve and do non-linear transformation before

the data is output. There are 4 curves selected by setting register Compand_Sel as shown in Figure 3.2

and this function is also Enable / Disable by user.