AR0230CS datasheet(10/24 Pages) ONSEMI

10 / 24 page

AR0230CS

www.onsemi.com

FEATURES OVERVIEW

For a complete description, recommendations, and usage

guidelines for product features, refer to the AR0230CS

Developer Guide.

3.0

mm Dual Conversion Gain Pixel

To improve the low light performance and keep the high

dynamic range, a large (3.0um) dual conversion gain pixel

is implemented for better image optimization. With a dual

conversion gain pixel, the conversion gain of the pixel may

be dynamically changed to better adapt the pixel response

based on dynamic range of the scene. This gain can be

switched manually or automatically by an auto exposure

control module.

HDR

By default, the sensor powers up in HDR Mode. The HDR

scheme used is multi−exposure HDR. This allows the sensor

to handle up to 96 dB of dynamic range. In HDR mode, the

sensor sequentially captures two exposures by maintaining

two separate read and reset pointers that are interleaved

within the rolling shutter readout. The intermediate pixel

values are stored in line buffers while waiting for the two

exposure values to be present. As soon as a pixel’s two

exposure values are available, they are combined to create

a linearized 16−bit value for each pixel’s response. The

exposure ratio may be set to 4x, 8x, 16x, or 32x. Depending

on whether HiSPi or Parallel mode is selected, the full 16 bit

value may be output, it can be compressed to 12 bits using

Adaptive Local Tone Mapping (ALTM), or companded to

12 or 14 bits.

Options to output T1 only, T2 only, or pixel interleaved

data are also available. Individual exposures may be read out

in a line interleaved mode as described in the T1/T2 Line

Interleaved Mode section.

Resolution

The active array supports a maximum of 1928x1088

pixels to support 1080p resolution. Utilizing a 3.0um pixel

will result in an optical format of 1/2.7−inch (approximately

6.6mm diagonal).

Frame Rate

At full (1080p) resolution, the AR0230CS is capable of

running up to 3060 fps.

Image Acquisition Mode

The AR0230CS supports two image acquisition modes:

• Electronic rolling shutter (ERS) mode

This is the normal mode of operation. When the

AR0230CS is streaming, it generates frames at a fixed rate,

and each frame is integrated (exposed) using the ERS. When

ERS mode 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 incident 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 register settings), the timing and control

logic controls the transition from old to new integration

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

the AR0230CS switches cleanly from the old integration

time to the new while only generating frames with uniform

integration. See “Changes to Integration Time” in the

AR0230CS Register Reference.

• 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

controlled

external

electromechanical shutter, and the AR0230CS provides

control signals to interface to that shutter. 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.

Embedded Data and Statistics

The AR0230CS has the capability to output image data

and statistics embedded within the frame timing. There are

two types of information embedded within the frame

readout.

• Embedded Data:

If enabled, these are displayed on the two rows

immediately before the first active pixel row is

displayed.

• Embedded Statistics:

If enabled, these are displayed on the two rows

immediately after the last active pixel row is displayed.

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