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AR0135CS Datasheet(PDF) 3 Page - ON Semiconductor |
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AR0135CS Datasheet(HTML) 3 Page - ON Semiconductor |
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3 / 27 page  AR0135CS www.onsemi.com 3 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. Figure 1. Block Diagram Control Registers Analog Processing and A/D Conversion Active Pixel Sensor (APS) Array Pixel Data Path (Signal Processing) Timing and Control (Sequencer) Auto Exposure and Stats Engine Temperature Sensor OTPM Memory PLL External Clock Signal Output Parallel Output Flash Trigger Two-wire Serial Interface Power 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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