version 2.0 rev 18 Feb 2021
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2.6.3.2 Global Shutter Internal Triggering (Overlap Mode)
In Internal Triggering in Overlap Mode, the read out of an exposure overlaps with the next exposure. This allows
the user to maximise the Cycle Time for a given exposure time. The absolute maximum frame rate achievable
is the time taken to read out both the Reference and Signal Frame from the sensor. As in Non-Overlap Mode,
the user has control over the exposure time and cycle time.
In this scenario, the exposure begins by pulsing the Global Clear. The reference frame is read out during the
exposure such that the end of the reference read out is coincident with the end of the exposure. The Charge
Transfer pulse then goes HIGH to transfer charge from all pixels in the sensor. The signal frame is then read out.
During this read out, a new exposure begins by pulsing the Global Clear.
Figure 28: Global Shutter Internal Triggering (Overlap Mode)
Table 25: Global Shutter Internal Triggering (Overlap Mode) Timing Parameters - Cycle Time Dependency
on Exposure
Parameter Minimum Maximum
Exposure 1 Frame + 1 InterFrame + 1 Row 2 Frames + 1 InterFrame
Cycle Time (1/Frame Rate) 2 Frames + 2 InterFrames + 1 Row 2 Frames + 2 InterFrames +1 Row
Acquisition Start Delay 0 1 Row
Exposure 2 Frames + 1 InterFrame + 1 Row 30 s
Cycle Time (1/Frame Rate) Exposure + 1 InterFrame + 1 Row 30 s
Acquisition Start Delay 0 1 Row
NOTE: The table shows that the cycle time depends on the exposure selected – within the exposure range
detailed in the rst row the cycle time is constant, however for exposures of (2 Frames + 1 Interframe + 1
Row) or longer the cycle time increases with exposure.
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