PYTHON25K Datasheet, PDF (15/87 Pages) ON Semiconductor – PYTHON 25K/16K/12K/10K Global Shutter CMOS Image Sensors

NOIP1SN025KA, NOIP1SN016KA, NOIP1SN012KA, NOIP1SN010KA
Non−Zero and Zero Row Overhead Time (ROT) Modes
In pipelined global shutter mode, the integration and
readout are done in parallel. Images are continuously read
out and integration of frame N is ongoing during readout of
the previous frame N−1. The readout of every frame starts
with a Frame Overhead Time (FOT), during which the
analog value of the pixel diode is transferred to the pixel
memory element. After the FOT, the sensor is read out line
by line and the readout of each line is preceded by a Row
Overhead Time (ROT) as shown in Figure 14.
In Reduced/Zero ROT operation mode (refer to
Figure 15), the row blanking and kernel readout occur in
parallel. This mode is called reduced ROT as a part of the
ROT is done while the image row is readout. The actual ROT
can thus be longer, however the perceived ROT will be
shorter (‘overhead’ spent per line is reduced).
( ) ^FOT
ROT
ys
Readout
ys
ROT
ys+1
This operation mode can be used for two reasons:
• Reduced total line time.
• Lower power due to reduced clock rate.
Readout
ys
ROT
ye
Readout
ye
Valid Data
Figure 14. Integration and Readout Sequence of the Sensor Operating in Pipelined Global Shutter Mode with
Non−Zero ROT Readout.
( ) ^FOT
ROT
ys
(blanked ou)t
ROT
ys+1
Readout
ys
ROT
ye
Readout
ye−1
Valid Data
ROT
dummy
Readout
ye
Figure 15. Integration and Readout Sequence of the Sensor operating in Pipelined Global Shutter Mode with
Zero ROT Readout.
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