GC1280 User Manual
70-0039A-B
AVT Inc.
26
Notes on Triggering
Definitions
o
User Trigger is the trigger signal applied by the user.
o
Logic Trigger is the trigger signal seen by the camera internal logic.
o
Tpd is the propagation delay between the User Trigger and the Logic Trigger.
o
Exposure is high when the camera image sensor is integrating light.
o
Readout is high when the camera image sensor is reading out data.
o
Trigger Latency is the time delay between the User Trigger and the start of Exposure.
o
Trigger Jitter is the error in the Trigger Latency time.
o
Trigger Ready indicates to the user that the camera will accept the next trigger.
o
Registered Exposure Time is the Exposure Time value currently stored in the camera
memory.
o
Interline Time is the time between sensor row readout cycles.
o
Imaging is high when the camera image sensor is either exposing and/or reading out data.
o
Idle is high if the camera image sensor is not exposing and/or reading out data.
Rules
o
The User Trigger pulse width should be at least three times the width of the Trigger Latency
as indicated in the Specifications section of this document.
o
The end of Exposure will always trigger the next Readout.
o
Exposure and Readout always occur consecutively for this sensor.
Triggering during the Idle State
o
For applications requiring the shortest possible Trigger Latency and the smallest possible
Trigger Jitter the User Trigger signal should be applied when Imaging is false and Idle is
true.
o
In this case, Trigger Latency and Trigger Jitter are as indicated in the Specifications section.
Triggering during the Readout State
o
Triggering during the Readout state is not available on this sensor.