Global Shutter External or Software Triggering

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 from the EXT input or sent via software. While waiting on the trigger event, the sensor is put into a “pre-scan read out cycle”. On detection of the trigger, the Global Clear line is pulsed to clear the charge from the sensor. The exposure period then starts and lasts for the user defined exposure time. 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. Finally, the signal frame is then read. The camera then returns to the “pre-scan read out cycle” awaiting for the next trigger.

Global Shutter External/Software Triggering (Non Overlap Mode)

Global Shutter External/Software Triggering Timing Parameters (Non Overlap Mode)

Parameter	Minimum	Maximum
Exposure	1 Frame + 4 Rows	30 s
Cycle Time (1/Frame Rate)	Exposure + 1 Frame + 1 InterFrame + 5 Rows
Acquisition Start Delay	1 Row	2 Rows
EXT Trig Pulse Width	2 Sensor Speed Clock Cycles

With overlap on Global Shutter External/Software Triggering (Overlap Mode), the camera can accept a trigger to begin the next exposure prior to the signal frame readout completing. Note that external triggers will be missed if it is too fast- refer to Global Shutter External/Software Triggering Timing Parameters (Overlap On) - Cycle Time Dependent on Exposure for guidelines on time restrictions.

Global Shutter External/Software Triggering (Overlap Mode)

Global Shutter External/Software Triggering Timing Parameters (Overlap On) - Cycle Time Dependent on Exposure

Parameter	Minimum	Maximum
Exposure	1 Frame + 1 InterFrame + 1 Row	2 Frames + 1 InterFrame + 4 Rows
Cycle Time (1/Frame Rate)	2 x (1 Frame + 1 InterFrame + 1 Row)
External Start Delay	1 Row	2 Rows
EXT Trig Pulse Width	2 Sensor Speed Clock Cycles	-
Exposure	2 Frames + 1 InterFrame + 5 Rows	30 s
Cycle Time (1/Frame Rate)	Exposure + 1 InterFrame + 2 Rows
External Start Delay	1 Row	2 Rows
EXT Trig Pulse Width	2 Sensor Speed Clock Cycles	-