CYIL1SM4000AA_09 Datasheet, PDF (14/31 Pages) Cypress Semiconductor – 4 MegaPixel CMOS Image Sensor

CYIL1SM4000AA
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.
The LUPA 4000 sensor is also used in sequential mode
(triggered snapshot mode) where readout and integration is
sequential. Figure 14 shows this sequential timing.
Figure 14. Integration and Readout in Sequence
Integration I
Read frame I
Integration I + 1
Read frame I + 1
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 12.
Figure 15 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 15. 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
integration time. At the end of the integration time, the information has to be stored onto the memory element for readout.)
Timing Specifications for each signal are shown in Table 12.
■ Falling edge of Precharge is equal or later than falling edge of
Vmem.
■ Sample is overlapping with precharge.
■ Rising edge of Vmem is more than 200 ns after rising edge of
Sample.
■ Rising edge of reset is equal or later than rising edge of Vmem.
Document Number: 38-05712 Rev. *C
Table 12. Timing specifications
Symbol
Name
a
Mem_HL
b
Precharge
c
Sample
d
Precharge-Sample
e
Integration time
Value
5 - 8.2 μs
3 - 6 μs
5 - 8 μs
> 2 μs
> 1 μs
Page 14 of 31
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