NOII5SM1300A
Figure 20 shows a recommended schematic for generating the basic signals and to avoid any timing problems.
FF
SS_START
SS_STOP
Y_CLOCK
Y_START
X_LOAD
SYS_CLOCK_N
SYS_CLOCK
Figure 20. Recommended Schematic for Basic Signals
Figure 21. Relative Timing of 5 ? Sequencer Control Signal
Global Shutter: Single Slope Integration
SS_START and SS_STOP must change on the falling
edge of the SYS_CLOCK (Tsetup and Thold > 7.5 ns). Make
certain that the pulse width of both signals is a minimum of
1 SYS_CLOCK cycle. As long as SS_START or SS_STOP
are asserted, the sequencer stays in a suspended state (see
Figure 22).
T 1 - Time counted by the integration timer until the value
of INT_TIME register is reached. The integration timer is
clocked by the granulated SS-sequencer clock.
T 2 - TIME_OUT signal stays high for one granulated
SS-sequencer clock period.
T 3 - There are no constraints for this time. Use the
TIME_OUT signal to trigger the SS_STOP pin (or use an
external counter to trigger SS_STOP); you cannot tie both
signals together.
T 4 - During this time, the SS-sequencer applies the control
signals to reset the image core and start integration. This
takes four granulated SS-sequencer clock periods. The
integration time counter starts counting at the first rising
edge after the falling edge of SS_START.
T 5 - The SS-sequencer puts the image core in a readable
state. It takes two granulated SS-sequencer clock periods.
T int - The ‘real’ integration or exposure time.
Figure 22. Global Shutter: Single Slope Integration
Global Shutter: Pixel Readout
Basic Operation
Y_START and Y_CLOCK must change on the falling
edge of the SYS_CLOCK (Tsetup and Thold > 7.5 ns). Make
certain that the pulse width is a minimum of one clock cycle
for Y_CLOCK and three clock cycles for Y_START. As
long as Y_CLOCK is applied, the sequencer stays in a
T 1 - Row blanking time: During this period, the
X-sequencer generates the control signals to sample the
pixel signal and pixel reset levels (double sampling
fpn-correction), and starts the readout of one line. The row
blanking time depends on the granularity of the X-sequencer
clock (see Table 21 on page 22).
suspended state. (See Figure 23)
http://onsemi.com
21
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