LUPA-4000 Datasheet, PDF (17/49 Pages) Cypress Semiconductor – 4M Pixel CMOS Image Sensor

LUPA-4000
Data Sheet
The values of the resistors depend on the value of R_ADC. The voltage difference
between ADC_VLOW and ADC_VHIGH should be at least 1.0V to assure proper
working of the ADC.
3.7 Synchronous shutter
In a synchronous (snapshot) shutter light integration takes place on all pixels in
parallel, although subsequent readout is sequential.
Line number
Integration time
Time axis
Burst Readout time
Figure 8: Synchronous shutter operation
Figure 8 shows the integration and read out sequence for the synchronous 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 read out cycle can occur in parallel or in
sequential mode. (ref. 4. Timing and read out of the image sensor)
3.8 Non-destructive readout (NDR)
The sensor can also be read out in a non-destructive way. After a pixel is initially
reset, it can be read multiple times, without resetting. The initial reset level and all
intermediate signals can be recorded. High light levels will saturate the pixels
quickly, but a useful signal is obtained from the early samples. For low light levels,
one has to use the later or latest samples.
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Contact: [e-mail] Document #: 38-05712 Rev.**(Revision 1.2 )
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