AR0330 datasheet(46/77 Pages) ONSEMI

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AR0330: 1/3-Inch CMOS Digital Image Sensor

Sensor Readout

AR0330_DS Rev. U Pub. 4/15 EN

©Semiconductor Components Industries, LLC,2015.

Sensor Readout

Image Acquisition Modes

The AR0330 supports two image acquisition modes:

• Electronic rolling shutter (ERS) mode

This is the normal mode of operation. When the AR0330 is streaming; it generates

frames at a fixed rate, and each frame is integrated (exposed) using the ERS. When the

ERS is in use, timing and control logic within the sensor sequences through the rows

of the array, resetting and then reading each row in turn. In the time interval between

resetting a row and subsequently reading that row, the pixels in the row integrate inci-

dent light. The integration (exposure) time is controlled by varying the time between

row reset and row readout. For each row in a frame, the time between row reset and

row readout is the same, leading to a uniform integration time across the frame. When

the integration time is changed (by using the two-wire serial interface to change regis-

ter settings), the timing and control logic controls the transition from old to new inte-

gration time in such a way that the stream of output frames from the AR0330 switches

cleanly from the old integration time to the new while only generating frames with

uniform integration. See “Changes to Integration Time” in the AR0330 Register Refer-

ence.

• Global reset mode

This mode can be used to acquire a single image at the current resolution. In this

mode, the end point of the pixel integration time is controlled by an external electro-

mechanical shutter, and the AR0330 provides control signals to interface to that shut-

ter.

The benefit of using an external electromechanical shutter is that it eliminates the

visual artifacts associated with ERS operation. Visual artifacts arise in ERS operation,

particularly at low frame rates, because an ERS image effectively integrates each row

of the pixel array at a different point in time.

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