IBIS4-A-6600 Datasheet, PDF (11/40 Pages) Cypress Semiconductor – 6.6 MP CMOS Image Sensor

ADVANCE
INFORMATION
IBIS4-A-6600
CYII4SM6600AB
Dark and Dummy Pixels
Black pixels are implemented as "optical" black pixels.
Floor Plan Pixel Array on page 11 shows a plan of the pixel
array. The sensor has been designed in "portrait" orientation.
A ring of dummy pixels surrounds the active pixels.
Figure 7. Floor Plan Pixel Array
Dummy ring of pixels ,
s urrounding complete pixel
array. not read
R ing of dummy pixels ,
covered with black layer,
re a da ble
R ing of 2 dummy pixels ,
illuminated, readable
array of active pixels , read
3002x 2210
2222
2210
Pixel Rate
The pixel rate for this sensor is high enough to support a frame
rate of >75 Hz for a window size of 640 x 480 pixels (VGA
format) + 23 pixels over scan in both directions. Taking into
account a row blanking time of 7.2 s (as baseline, see also
2.10.2.1.g.), this requires a minimum pixel rate of nearly 40
MHz. The final bandwidth of the column amplifiers, output
stage etc. is determined by external bias resistors. Taken into
account a pixel rate of 40 MHz a full frame rate of a little more
than 5 frames/s will be obtained.
The frame period of the IBIS4-6600 sensor can be calculated
as follows:
=> Frame period = (Nr. Lines * (RBT + pixel period * Nr.
Pixels))
With:
Nr. Lines: Number of Lines read out each frame (Y).
Nr. Pixels: Number of pixels read out each line (X).
RBT: Row Blanking Time = 7.2 us (typical).
Pixel period: 1/40 MHz = 25 ns.
Example: read out time of the full resolution at nominal speed
(40 MHz pixel rate):
=> Frame period = (3002 * (7.2 us + 25 ns * 2210)) = 187.5
ms => 5.33 fps.
Region of Interest (ROI) Read Out
Windowing can easily be achieved by uploading the starting
point of the x- and y-shift registers in the sensor registers (see
2.9.1). This downloaded starting point initiates the shift register
in the x- and y-direction triggered by the Y_START (initiates
the Y-shift register) and the Y_CLK (initiates the X-shift
register) pulse. The minimum step size for the x-address is 24
(only even start addresses can be chosen) and 1 for the
Y-address (every line can be addressed). The frame rate
increases almost linearly when fewer pixels are read out. Table
8. gives an overview of the achievable frame rates with ROI
read out.
Table 8. Frame Rate vs. Resolution
Image Resolution (Y*X)
3002 x 2210
1501 x 1104
640 x 480
Frame rate [frames/s]
5
14
89
Frame readout time [ms]
187.5
67
11
Comment
Full resolution.
ROI read out.
11
Document Number: 001-02366 Rev. *D
Page 11 of 40
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