AS0260CSSC28SUD20 datasheet(16/83 Pages) ONSEMI

16 / 83 page

AS0260 DS Rev. G Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

AS0260: 1/6-Inch 1080P High-Definition (HD) System-On-A-Chip (SOC) Digi-

tal Image Sensor

Sensor Control

The sensor core of the AS0260 is a progressive-scan sensor that generates a stream of

pixel data at a constant frame rate. Figure 9 shows a block diagram of the sensor core.

The timing and control circuitry sequences through the rows of the array, resetting and

then reading each row in turn. In the time interval between resetting a row and reading

that row, the pixels in the row integrate incident light. The exposure is controlled by

varying the time interval between reset and readout. Once a row has been selected, the

data from each column is sequenced through an analog signal chain, including offset

correction, gain adjustment, and ADC. The final stage of sensor core converts the output

of the ADC into 10-bit data for each pixel in the array.

The pixel array contains optically active and light-shielded (dark) pixels. The dark pixels

are used to provide data for the offset-correction algorithms (black level control).

The sensor core contains a set of control and status registers that can be used to control

many aspects of the sensor behavior including the frame size, exposure, and gain

setting. These registers are controlled by the MCU firmware and are also accessible by

the host processor through the two-wire serial interface.

The output from the sensor core is a Bayer pattern; alternate rows are a sequence of

either green and red pixels or blue and green pixels. The analog signal chain provides

per-color control of the pixel data.

Figure 9:

Sensor Core Block Diagram

Sensor Core

Control Registers

System Control

10-Bit

Data Out

G1/G2

R/B

G1/G2

R/B

Green1/Green2

Channel

Red/Blue

Channel

1080p

Active-Pixel

Sensor (APS)

Array

Analog

Processing

ADC

Digital

Processing

Timing

and

Control

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