NOIL2SM1300A_15 Datasheet, PDF (17/44 Pages) ON Semiconductor – High Speed CMOS Image Sensor

NOIL2SM1300A
IMAGE SENSOR TIMING AND READOUT
Frame Rate and Windowing
Frame Rate
The frame rate depends on the input clock, the frame overhead time (FOT), and the row overhead time (ROT). The frame
period is calculated as follows:
1 kernel = 24 Pixels = 2 Timeslots = 2 Granularity clock cycles
Table 10. FRAME RATE PARAMETERS
Parameter
FOT
ROT
Nr. Lines
Nr. Pixels
Clock Period
Comment
Frame Overhead Time
Row Overhead Time
Number of lines read out each frame
Number of pixels read out each line
1/63 MHz = 15.9 ns
Clarification
Programmable: Default 315 granularity clock cycles (5 ms at 63 MHz)
Programmable: Default 9 granularity clock cycles (143.1 ns at 63 MHz)
Number of lines in ROI
Number of pixels in ROI
Every channel works at 63 MHz ³12 channels result in 756 MHz data rate
NOTE: For more information on FPS calculation, refer the ON Semiconductor application note AN57864.
In global shutter mode, the whole pixel array is integrated simultaneously including the dummy line for FPN correction.
Figure 12. Timing Diagram
Windowing
Windowing is easily achieved by SPI. The starting point
of the x and y address and the window size can be uploaded.
The minimum step size in the x-direction is 24 pixels
(choose only multiples of 24 as start or stop addresses). The
minimum step size in the y-direction is one line (every line
can be addressed) in normal mode, and two lines in sub
sampling mode.
The section Sequencer and Logic on page 11 discusses the
use of registers to achieve the desired ROI.
Table 11. TYPICAL FRAME RATES AT 315 MHz
Image
Resolution (X*Y)
Frame Read
Out Time (ms)
Frame Rate (fps)
1296 x 1024
1.9760
506
1008 x 1000
1.5807
633
816 x 600
0.7997
1250
648 x 480
0.5370
1862
528 x 512
0.4887
2046
264 x 256
0.1596
6266
144 x 128
0.0640
15625
24 x 2
0.0098
102249
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