Rolling Shutter External 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 discarded as it does not contain the correct exposure period. Reading out a frame effectively begins a new 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.

Rolling Shutter External/Software Trigger (Non Overlap Mode)

 

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	-