NOII5SM1300A
Rolling Shutter Operation
The integration of the light in the image sensor is done
during readout of the other lines.
The only difference with synchronous shutter is that the
TIME_OUT pin is used to indicate when the Y_SYNC pulse
for the right Y-shift-register (reset Y-shift register) is
generated. This loads the right Y-shift-register with the
pointer loaded in register YR_REG. The Y_SYNC pulse for
the left Y-shift register (read Y-shift register) is generated
with Y_START.
The INT_TIME register defines how many lines to count
before the Y_SYNC of the right Y-shift-register is
generated, hence defining the integration time. See also
INT_TIME Register (11:0) on page 18 for a detailed
description of the rolling shutter operation.
Windowing in X-Direction
An X_LOAD pulse overrides the internal X_SYNC
signal, loading a new X-pointer (stored in the X_REG
register) into the X-shift-register.
The X_LOAD pulse must appear on the falling edge of
SYS_CLOCK and remain high for two SYS_CLOCK
cycles overlapping two rising edges of SYS_CLOCK. The
new X-pointer is loaded on one of the two rising edges of
SYS_CLOCK.
The available time to upload the register is T load ; it is
defined from the previous register load to the rising edge of
X_LOAD. It depends on the settling time of the register and
the X-decoder.
Table 25. T load FOR DIFFERENT INTERFACES
T int Integration time [# lines] = register(NROF_LINES)
– register(INT_TIME)
NOTE: For normal operation the values of the YL_REG
and YR_REG registers are equal.
Interface Mode
Parallel interface
Serial 3 Wire
T load ( m s)
1 (about 40 SYS_CLOCK cycles)
16 (at 2.5 MHz data rate)
The actual time to load the register itself depends on the
interface mode that is used. The parallel interface is the
fastest.
Figure 26. Rolling Shutter Operation
Figure 27. Windowing in X ? Direction
http://onsemi.com
24
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