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PYTHON480 データシート(PDF) 14 Page - ON Semiconductor |
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PYTHON480 データシート(HTML) 14 Page - ON Semiconductor |
14 / 69 page PYTHON 480 www.onsemi.com 14 OPERATING MODES Global Shutter Mode The PYTHON 480 operates in pipelined or triggered global shuttering modes. In this mode, light integration takes place on all pixels in parallel, although subsequent readout is sequential. Figure 12 shows the integration and readout sequence for the global shutter. All pixels are light sensitive at the same period of time. The whole pixel core is reset simultaneously and after the integration time all pixel values are sampled together on the storage node inside each pixel. The pixel core is read out line by line after integration. Note that the integration and readout can occur in parallel or sequentially. The integration starts at a certain period, relative to the frame start. Figure 12. Global Shutter Operation Pipelined Global Shutter Mode In pipelined global shutter mode, the integration and readout are done in parallel. Images are continuously read and integration of frame N is ongoing during readout of the previous frame N−1. The readout of every frame starts with a Frame Overhead Time (FOT), during which the analog value on the pixel diode is transferred to the pixel memory element. After the FOT, the sensor is read out line per line and the readout of each line is preceded by the Row Overhead Time (ROT). Figure 13 shows the exposure and readout time line in pipelined global shutter mode. Master Mode In this mode, the integration time is set through the register interface and the sensor integrates and reads out the images autonomously. The sensor acquires images without any user interaction. Figure 13. Integration and Readout for Pipelined Shutter Reset N Exposure Time N Reset N+1 Exposure Time N+1 Readout Frame N-1 FOT FOT Readout Frame N FOT Integration Time Handling Readout Handling ROT Line Readout FOT FOT Slave Mode The slave mode adds more manual control to the sensor. The integration time registers are ignored in this mode and the integration time is instead controlled by an external pin. As soon as the control pin is asserted, the pixel array goes out of reset and integration starts. The integration continues until the user or system deasserts the external pin. Upon a falling edge of the trigger input, the image is sampled and the readout begins. Figure 14 shows the relation between the external trigger signal and the exposure/readout timing. |
同様の部品番号 - PYTHON480 |
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同様の説明 - PYTHON480 |
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