AS0260CSSC28SUD20 datasheet(39/83 Pages) ONSEMI

39 / 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

Exposure Control

To achieve the required amount of exposure, the AE driver adjusts the sensor integration

time, gains and IFP digital gains. In addition, a variable is available for the user to adjust

the overall brightness of the scene. To reject flicker, integration time is typically adjusted

in increments of steps. The incremental step specifies the duration in row times equal to

one flicker period. Thus, flicker is rejected if integration time is kept a natural factor of

the flicker period.

Auto White Balance

The AS0260 has a built-in AWB algorithm designed to compensate for the effects of

changing spectra of the scene illumination on the quality of the color rendition. The

algorithm consists of two major parts: a measurement engine performing statistical

analysis of the image and a driver performing the selection of the optimal color correc-

tion matrix and SOC digital gain. While default settings of these algorithms are adequate

in most situations, the user can reprogram base color correction matrices, place limits

on color channel gains, and control the speed of both matrix and gain adjustments. The

AS0260 AWB displays in color temperature, the range of which is defined by the

programming of the CCM matrixes.

Flicker Detection and Avoidance

Flicker occurs when the integration time is not an integer multiple of the period of the

light intensity. The AS0260 can be programmed to detect and avoid flicker for 50 or

60 Hz. For integration times below the light intensity period (10ms for 50Hz environ-

ment), flicker cannot be avoided. The AS0260 supports an indoor AE mode, that will

ensure flicker-free operation. The AS0260 will calculate all flicker parameter based on

the sensor settings which are programmed in the cam control variables.

Ambient Light Measurement

To facilitate the measurement of the ambient light lux level used in the dimming of note-

book computer LCD screens and other light-sensitive peripherals, the AS0260 has an

ambient light measurement mode. This mode takes the image data from the scene and

translates it to a value that can be read by the host system over the two-wire serial inter-

face. This ambient light measurement can be made during normal video streaming or

during soft-standby.

Presence Detection

The AS0260 offers a presence detection mode to reduce the amount of processing the

host system needs to do in power regulation (LCD dimming or on/off controls) func-

tions. This presence detection mode operates only when the AS0260 is placed in soft-

standby mode. When the presence of a large object (like a person sitting down in front of

a notebook computer) is detected by the image sensor, a register bit is changed to indi-

cate an object's presence has been detected. During presence detection mode, the host

system is expected to regularly poll this bit over the two-wire serial interface to deter-

mine if and when an object's presence has been detected.

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