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NOIL1SM4000A
TIMING AND READOUT OF IMAGE SENSOR
The timing of the LUPA4000 sensor consists of two parts.
The first part is related to the control of the pixels, the
integration time, and the signal level. The second part is
related to the readout of the image sensor. As full
synchronous shutter is possible with this image sensor,
Read Frame I
Integration I+1
Read Frame I+1
Integration I+2
integration time and readout can be in parallel or sequential.
In the parallel mode, the integration time of the frame I is
ongoing during readout of frame I-1. Figure 12 shows this
parallel timing structure.
The control of the frame’s readout and integration time are
independent of each other with the only exception that the
end of the integration time from frame I+1 is the beginning
of the readout of frame I+1.
Figure 12. Integration and Readout in Parallel
The LUPA4000 sensor is also used in sequential mode
(triggered snapshot mode) where readout and integration is
sequential. Figure 13 shows this sequential timing.
Integration Frame I
Read Frame I
Integration I+1
Read Frame I+1
Figure 13. Integration and Readout in Sequence
Timing of Pixel Array
The first part of the timing is related to the timing of the
pixel array. This implies control of integration time,
synchronous shutter operation, and sampling of the pixel
information onto the memory element inside each pixel. The
signals required for this control are described in Pixel Array
Signals and in Figure 11.
Figure 14 shows the external applied signals required to
control the pixel array. At the end of the integration time
from frame I+1, the signals Mem_hl, precharge, and sample
must be given. The reset signal controls the integration time,
which is defined as the time between the falling edge of reset
and the rising edge of sample.
Figure 14. Pixel Array Timing
The integration time is determined by the falling edge of
the reset pulse. The longer the pulse is high, the shorter the
information must be stored onto the memory element for
readout.
integration time. At the end of the integration time, the
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相关PDF资料
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相关代理商/技术参数
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