VCC-5CL1R
Rev. 905-0022-02
©2015 CIS Corporation. All rights reserved.
23
7.10.
Pulse Width Trigger Shutter Mode
□
This is the mode to start exposure with external trigger input signals, and set the exposure time with the
pulse width of the trigger signals.
□
Trigger operation is CLK-sync and HV-sync Reset.
□
The delay time (Exposure Time Delay
①
) from detecting trigger starting edge to starting exposure output
(TTL) , and the delay time (Exposure Time Delay
②
) from
detecting trigger completing edge to
completing exposure output (TTL) differ by modes as shown below.
Exposure Time Delay
①
2Taps 4Taps 8Taps 10Taps
Horizontal 2560 pixels
51µs
27µs
15µs
13µs
Horizontal 2048 pixels
42µs
22µs
13µs
11µs
Horizontal 1920 pixels
39µs
21µs
12µs
10µs
Exposure Time Delay
②
2Taps 4Taps 8Taps 10Taps
Horizontal 2560 pixels
49µs
25µs
13µs
11µs
Horizontal 2048 pixels
40µs
20µs
10µs
9µs
Horizontal 1920 pixels
37µs
19µs
9µs
8µs
*The value for 2x2 binning and 4x4 binning are the same as the one for horizontal 2560 pixels.
*With the above Exposure Time Delay
①
and
②
, several dozen ns of jitter occur due to asynchronous loading.
*The actual exposure period is longer by approx. 1µs at the front and approx. 8µs at the end as shown below.
□
Pulse width 3
µ
s ~ 2 frames
Functionally, no upper limitation is set but, at long exposure, the increase of noises, the decrease of
setup level, and decrease of white clip level might occur.
□
The next trigger can be accepted during outputting the current image. However, while the image output
is on-going, do not input a trigger to start the next image output.
□
The camera internally ignores any trigger input between Exposure Time start and Read-out start. Refer
to (A) in the drawing below.
□
Any trigger input between Exposure Time start and Read-out start shall be ignored in the camera as
shown (A) below. When a read-out period (FVAL=1) and the exposure start (start-up of Exposure
Time) are overlapped, LVAL and DVAL output Low for 4H, and stop outputting images.
