AR0230 Datasheet, PDF (16/36 Pages) ON Semiconductor – Full HD Digital Image Sensor

AR0230CS: 1/2.7-Inch 2.1 Mp/Full HD Digital Image Sensor
Features Overview
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 inte-
gration. 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 is controlled by an 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 arti-
facts 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.
Multi-Camera Synchronization
The AR0230CS supports advanced line synchronization controls for multi-camera
(stereo) support.
Slave Mode
The slave mode feature of the AR0230CS supports triggering the start of a frame readout
from an input signal that is supplied from an external ASIC. The slave mode signal allows
for precise control of frame rate and register change updates.
Context Switching and Register Updates
The user has the option of using the highly configurable context memory, or a simplified
implementation in which only a subset of registers is available for switching. The
AR0230 supports a highly configurable context switching RAM of size 256 x 16. Within
this Context Memory, changes to any register may be stored. The register set for each
context must be the same, but the number of contexts and registers per context are
limited only by the size of the context memory.
Alternatively, the user may switch between two predefined register sets A and B by
writing to a context switch change bit. When the context switch is configured to context
A the sensor will reference the context A registers. If the context switch is changed from A
to B during the readout of frame n, the sensor will then reference the context B
coarse_integration_time registers in frame n+1 and all other context B registers at the
beginning of reading frame n+2. The sensor will show the same behavior when changing
from context B to context A. The registers listed in Table 4 are context-switchable:
AR0230CS/D Rev. 8, Pub. 11/15 EN
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