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PYTHON480 데이터시트(PDF) 28 Page - ON Semiconductor |
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PYTHON480 데이터시트(HTML) 28 Page - ON Semiconductor |
28 / 69 page PYTHON 480 www.onsemi.com 28 Triggered Global Shutter (Master) In master triggered global mode, the start of integration time is controlled by a rising edge on the trigger0 pin. The exposure or integration time is defined by the registers exposure and mult_timer, as in the master pipelined global mode. The fr_length configuration is not used. This operation is graphically shown in Figure 23. Figure 23. Exposure Time Control in Triggered Shutter Mode (Master) Reset Integrating Reset Integrating Image Array Global Reset Readout FOT FOT FOT FOT FOT FOT exposure x mult_timer Frame N Frame N+1 Exposure State (No effect on falling edge) trigger0 = ROT = Readout = Readout Dummy Line (blanked) Notes: • The falling edge on the trigger pin does not have any impact. Note however the trigger must be asserted for at least 100 ns. • 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. • If the exposure timer expires before the end of readout, the exposure time is extended until the end of the last active line. • The trigger pin needs to be kept low during the FOT. The monitor pins can be used as a feedback to the FPGA/controller (eg. use monitor0, indicating the very first line when monitor_select = 0x5 − a new trigger can be initiated after a rising edge on monitor0). Triggered Global Shutter (Slave) Exposure or integration time is fully controlled by means of the trigger pin in slave mode. The registers fr_length, exposure and mult_timer are ignored by the sensor. A rising edge on the trigger pin indicates the start of the exposure time, while a falling edge initiates the transfer to the pixel storage node and readout of the image array. In other words, the high time of the trigger pin indicates the integration time, the period of the trigger pin indicates the frame time. The use of the trigger during slave mode is shown in Figure 24. Notes: • The registers exposure, fr_length, and mult_timer are not used in this mode. • The start of 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. • If the trigger is de−asserted before the end of readout, the exposure time is extended until the end of the last active line. • The trigger pin needs to be kept low during the FOT. The monitor pins can be used as a feedback to the FPGA/controller (eg. use monitor0, indicating the very first line when monitor_select = 0x5 − a new trigger can be initiated after a rising edge on monitor0). Figure 24. Exposure Time Control in Global−Slave Mode Reset Integrating Reset Integrating Image Array Global Reset Readout FOT FOT FOT FOT FOT FOT Frame N Frame N+1 Exposure State trigger0 = ROT = Readout = Readout Dummy Line (blanked) |
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