AR0135CS Datasheet, PDF (3/27 Pages) ON Semiconductor – 1/3‐inch 1.2 Mp CMOS Digital Image Sensor

AR0135CS
FUNCTIONAL OVERVIEW
The AR0135CS is a progressive-scan sensor that
generates a stream of pixel data at a constant frame rate. It
uses an on-chip, phase-locked loop (PLL) that can be
optionally enabled to generate all internal clocks from
a single master input clock running between 6 and 50 MHz.
The maximum output pixel rate is 74.25 Mp/s,
corresponding to a clock rate of 74.25 MHz. Figure 1 shows
a block diagram of the sensor.
Power
Trigger
Two-wire
Serial
Interface
Active Pixel Sensor
(APS)
Array
Analog Processing and
A/D Conversion
Temperature
Sensor
OTPM
Memory
PLL
Timing and Control
(Sequencer)
Auto Exposure
and Stats Engine
Pixel Data Path
(Signal Processing)
Control Registers
Figure 1. Block Diagram
External
Clock
Signal
Output
Parallel
Output
Flash
User interaction with the sensor is through the two-wire
serial bus, which communicates with the array control,
analog signal chain, and digital signal chain. The core of the
sensor is a 1.2 Mp Active-Pixel Sensor array. The
AR0135CS features global shutter technology for accurate
capture of moving images. The exposure of the entire array
is controlled by programming the integration time by
register setting. All rows simultaneously integrate light prior
to readout. Once a row has been read, the data from the
columns is sequenced through an analog signal chain
(providing offset correction and gain), and then through an
analog-to-digital converter (ADC). The output from the
ADC is a 12-bit value for each pixel in the array. The ADC
output passes through a digital processing signal chain
(which provides further data path corrections and applies
digital gain). The pixel data are output at a rate of up to
74.25 Mp/s, in parallel to frame and line synchronization
signals.
FEATURES OVERVIEW
The AR0135CS Global Sensor shutter has a wide array of
features to enhance functionality and to increase versatility.
A summary of features follows. Please refer to the
AR0135CS Developer Guide for detailed feature
descriptions, register settings, and tuning guidelines and
recommendations.
• Operating Modes
The AR0135CS works in master (video), trigger (single
frame), or Auto Trigger modes. In master mode,
the sensor generates the integration and readout timing.
In trigger mode, it accepts an external trigger to start
exposure, then generates the exposure and readout
timing. The exposure time is programmed through the
two-wire serial interface for both modes. Trigger mode
is not compatible with the HiSPi interface.
• Window Control
Configurable window size and blanking times allow
a wide range of resolutions and frame rates. Digital
binning and skipping modes are supported, as are
vertical and horizontal mirror operations.
• Context Switching
Context switching may be used to rapidly switch
between two sets of register values. Refer to the
AR0135CS Developer Guide for a complete set of
context switchable registers.
• Gain
The AR0135CS Global Shutter sensor can be
configured for analog gain of up to 8x, and digital gain
of up to 8x.
• Automatic Exposure Control
The integrated automatic exposure control may be used
to ensure optimal settings of exposure and gain are
computed and updated every other frame. Refer to the
AR0135CS Developer Guide for more details.
• HiSPi
The AR0135CS Global Shutter image sensor supports
two or three lanes of Packetized-SP protocols of
ON Semiconductor’s High-Speed Serial Pixel Interface.
• PLL
An on chip PLL provides reference clock flexibility and
supports spread spectrum sources for improved EMI
performance.
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