MT9V032
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31
FEATURE DESCRIPTION
Operational Modes
The MT9V032 works in master, snapshot, or slave mode.
In master mode the sensor generates the readout timing. In
snapshot mode it accepts an external trigger to start
integration, then generates the readout timing. In slave mode
the sensor accepts both external integration and readout
controls. The integration time is programmed through the
two−wire serial interface during master or snapshot modes,
or controlled through externally generated control signal
during slave mode.
Master Mode
There are two possible operation methods for master
mode: simultaneous and sequential. One of these operation
modes must be selected through the two−wire serial
interface.
Simultaneous Master Mode
In simultaneous master mode, the exposure period occurs
during readout. The frame synchronization waveforms are
shown in Figure13 and Figure 14. The exposure and readout
happen in parallel rather than sequentially, making this the
fastest mode of operation.
Figure 13. Simultaneous Master Mode Synchronization Waveforms #1
Readout Time > Exposure Time
Readout Time
LED_OUT
FRAME_VALID
XXX
Vertical Blanking
XXX XXX
LINE_VALID
D
OUT
(9:0)
LED_OUT
FRAME_VALID
XXX
XXX
XXX
LINE_VALID
D
OUT
(9:0
)
Vertical Blanking
Exposure Time
Exposure Time > Readout Time
Figure 14. Simultaneous Master Mode Synchronization Waveforms #2
D
OUT
(9:0)
When exposure time is greater than the sum of vertical
blank and window height, the number of vertical blank rows
is increased automatically to accommodate the exposure
time.
Sequential Master Mode
In sequential master mode the exposure period is followed
by readout. The frame synchronization waveforms for
sequential master mode are shown in Figure15. The frame
rate changes as the integration time changes.
