version 2.0 rev 18 Feb 2021
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2.6.2.5 Rolling Shutter External / Software Triggering (Non Overlap Mode)
In this section, both External and Software Trigger are described in the same diagram as the acquisition
sequence is the same. The trigger event can either be from the EXT Trigger input or sent via software. While
waiting on the trigger event, the sensor is put into a “pre-scan read out cycle” and is held in a Global Clear State
which ensures that charge build up on the sensor is kept to a minimum while waiting for the trigger event. The
ARM signal is asserted to indicate it is ready to detect an incoming trigger input.
Once the trigger event is detected, Global Clear goes LOW and a frame read out is initiated. This frame is
discardedasitdoesnotcontainthecorrectexposureperiod.Readingoutaframeeectivelybeginsanew
exposure. When the exposure period has completed, a signal frame read out phase begins. When the frame
has been read out completely, the Global Clear is held HIGH until the next trigger event is detected.
The external trigger is fed via the EXT Trigger input on the I/O Connector on the camera head.
Figure 19: Rolling Shutter External/Software Trigger (Non Overlap Mode)
Table 15: Rolling Shutter External/Software Triggering Timing Parameters
Parameter Minimum Maximum
Exposure 3 Rows 30 s
Cycle Time (1/Frame Rate) Exposure + 1 Frame + 1 Row -
External Start Delay 0 1 Row
EXT Trig Pulse Width 2 Sensor Speed Clock Cycles -
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