IBIS4-6600_09 Datasheet, PDF (15/35 Pages) Cypress Semiconductor – 6.6 MP CMOS Image Sensor

IBIS4-6600 CYII4SM6600AB
Electronic Shutter
An electronic shutter similar to a rolling curtain is implemented on-chip. As shown in Figure 17, there are two Y shift registers. One
shift register points to the row that is currently being read out. The other shift register points to the row that is currently being reset.
Both pointers are shifted by the same Y-clock and move over the focal plane. The integration time is set by the delay between both
pointers.
Figure 16. Electronic Shutter
Readout
pointer
Reset
pointer
In case of a mechanical shutter, the two shift registers can be combined to simultaneously apply the pulses from both sides of the
pixel array. This is to halve the influence of the parasitic RC times of the reset and select lines in the pixel array. This can result in a
reduction of the row blanking time. This is the case when FAST_RESET in the SEQUENCER register is set to 1, or in the
nondestructive readout modes 1 and 2.
Figure 17. Electronic Rolling Shutter Operation
Line number
Reset sequence
Frame time
Time axis
Integration time
Document Number: 001-02366 Rev. *E
Page 15 of 35
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