AR0237CS Datasheet, PDF (19/38 Pages) ON Semiconductor – 1/2.7-Inch 2.1 Mp/Full HD Digital Image Sensor

AR0237CS: 1/2.7-Inch 2.1 Mp/Full HD Digital Image Sensor
Features Overview
Features Overview
For a complete description, recommendations, and usage guidelines for product
features, refer to the AR0237 Developer Guide.
3.0m 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.
HDR
By default, the sensor powers up in Linear Mode. One can change to 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 exposure ratio may be set to 4x, 8x, 16x, or 32x. Sensor also provides
flexibility to choose any exposure ratio by setting number of t2 exposure rows indepen-
dent of the t1 exposure. The data will be output as line interleaved data as described in
the T1/T2 Line Interleaved Mode section. There is also an option to output either T1
only or T2 only.
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 AR0237 is capable of running up to 60 fps in linear mode
and 30 fps in line interleaved mode.
Image Acquisition Mode
The AR0237 supports two image acquisition modes:
• Electronic rolling shutter (ERS) mode
This is the normal mode of operation. When the AR0237 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 reset-
ting 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 AR0237 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 AR0237 Register Reference.
AR0237CS/D Rev. 4, 6/16 EN
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