AS0260CSSC28SUD20 datasheet(36/83 Pages) ONSEMI

36 / 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

Camera Control and Auto Functions

General Purpose I/Os

The three general purpose I/Os (GPIOs) of the AS0260 can be configured in multiple

ways. Each of the I/Os can be used for multiple purposes and can be programmed from

the host. The GPIOs are powered by their own power supply.

Auto Exposure

The auto exposure algorithm performs automatic adjustments of the image brightness

by controlling exposure time and analog gains of the sensor core as well as digital gains

applied to the image.

Auto exposure is implemented by a firmware driver that analyzes image statistics

collected by the exposure measurement engine, makes a decision, and programs the

sensor core and color pipeline to achieve the desired exposure. The measurement

engine subdivides the image into 25 windows organized as a 5 x 5 grid.

Two auto exposure algorithm modes are available:

• Average brightness tracking (ABT) or Average Y (ae_rule_algo=0x00)

The average brightness tracking AE uses a constant average tracking algorithm where

a target brightness value is compared to a current brightness value, and the gain and

integration time are adjusted accordingly to meet the target requirement.

• Weighted Average Brightness (ae_rule_algo=0x01)

Each of the 25 windows can be assigned a weight, which can be changed inde-

pendently of each other. The effect of these weights will allow the center of the image

to be weighted higher than the periphery. See Figure 27.

Figure 27:

5 x 5 Grid

• Adaptive Weighted AE for highlights (ae_rule_algo=0x02)- The scene will be exposed

based on zone luma and will adapt for highlights. This would expose an image when

the background is dark.

• Adaptive Weighted AE for lowlights(ae_rule_algo=0x03)- The scene will be exposed

based on zone luma and will adapt for lowlights. This would expose an image when

the background is brighter.

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