CYIL1SM0300AA CYPRESS [Cypress Semiconductor], CYIL1SM0300AA Datasheet - Page 35

• Manufacturer Part Number: CYIL1SM0300AA
• Description: LUPA-300 CMOS Image Sensor
• Manufacturer: CYPRESS [Cypress Semiconductor]

APPENDIX A: Frequently Asked Questions
Q:
A:
The green lines are the analog signal on the photodiode, which
decrease as a result of exposure. The slope is determined by
the amount of light at each pixel (the more light the steeper the
slope). When the pixels reach the saturation level the analog
signal will not change despite further exposure. As you can
see, without any double slope pulse pixels p3 and p4 will reach
saturation before the sample moment of the analog values--no
signal will be acquired without double slope. When double
slope is enabled a second reset pulse will be given (blue line)
at a certain time before the end of the integration time. This
double slope reset pulse resets the analog signal of the pixels
Document Number: 001-00371 Rev. *D
© Cypress Semiconductor Corporation, 2006. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be
used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
How does the dual (multiple) slope extended dynamic range mode work?
Reset pulse
Total integration time
Double slope reset pulse
Figure 27. Dual Slope Diagram
Read out
BELOW this level to the reset level. After the reset the analog
signal starts to decrease with the same slope as before the
double slope reset pulse. If the double slope reset pulse is
placed at the end of the integration time (90% for instance) the
analog signal that would have reach the saturation levels
aren't saturated anymore (this increases the optical dynamic
range) at read out. It's important to notice that pixel signals
above the double slope reset level will not be influenced by this
double slope reset pulse (p1 and p2). If desired, additional
reset pulses can be given at lower levels to achieve multiple
slope.
p1
p4
p2
p3
Double slope reset time (usually 5-
10% of the total integration time)
Reset level 1
Reset level 2
Saturation level
CYIL1SM0300AA
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