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PYTHON480 データシート(PDF) 27 Page - ON Semiconductor |
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PYTHON480 データシート(HTML) 27 Page - ON Semiconductor |
27 / 69 page PYTHON 480 www.onsemi.com 27 Table 19. SPI TIMING REQUIREMENTS Group Addresses Description Units tsck sck clock period 100 (*) ns tsssck ss_n low to sck rising edge tsck ns tsckss sck falling edge to ss_n high tsck ns ts_mosi Required setup time for mosi 20 ns th_mosi Required hold time for mosi 20 ns ts_miso Setup time for miso tsck/2−10 ns th_miso Hold time for miso tsck/2−20 ns tspi Minimal time between two consecutive SPI accesses (not shown in figure) 2 x tsck ns *Value indicated is for nominal operation. The maximum SPI clock frequency depends on the sensor configuration (operation mode, input clock). tsck is defined as 1/fSPI. See text for more information on SPI clock frequency restrictions. IMAGE SENSOR TIMING AND READOUT The following sections describe the configurations for single slope reset mechanism. Extra integration time registers are available. Pipelined Global Shutter (Master) The integration time is controlled by the registers fr_length[15:0] and exposure[15:0]. The mult_timer configuration defines the granularity of the registers reset_length and exposure. It is read as number of system clock cycles (14.706 ns nominal at 68 MHz). The exposure control for (Pipelined) Global Master mode is depicted in Figure 22. The pixel values are transferred to the storage node during FOT, after which all photo diodes are reset. The reset state remains active for a certain time, defined by the reset_length and mult_timer registers, as shown in the figure. Note that meanwhile the image array is read out line by line. After this reset period, the global photodiode reset condition is abandoned. This indicates the start of the integration or exposure time. The length of the exposure time is defined by the registers exposure and mult_timer. NOTE: The start of the exposure time is synchronized to the start of a new line (during ROT) if the exposure period starts during a frame readout. As a consequence, the effective time during which the image core is in a reset state is extended to the start of a new line. • Make sure that the sum of the reset time and exposure time exceeds the time required to readout all lines. If this is not the case, the exposure time is extended until all (active) lines are read out. • Alternatively, it is possible to specify the frame time and exposure time. The sensor automatically calculates the required reset time. This mode is enabled by the fr_mode register. The frame time is specified in the register fr_length. Figure 22. Integration Control for (Pipelined) Global Shutter Mode (Master) Reset Integrating Reset Integrating Image Array Global Reset Readout FOT FOT FOT FOT FOT FOT reset_length x mult_timer Frame N Frame N+1 Exposure State = ROT = Readout = Readout Dummy Line (blanked) exposure x mult_timer |
同様の部品番号 - PYTHON480 |
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同様の説明 - PYTHON480 |
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