STC-A33A
User Guide
20
Rev 1.0
3. Pulse Width Trigger Mode (Non-Reset, Internal Sync)
Note 1: The camera does NOT switch to the normal mode when the long exposure mode is selected. This timing chart
shows when the long exposure mode is selected.
Note 2: The internal VD signal does not reset by the trigger signal. The video output signal is sent out at the next VD
timing.
Note 3: The exposure time is controlled by the pulse width of the trigger signal.
Note 4: The external VD signal inputs continuously during the external sync mode.
Note 5: The WEN signal does not output when the exposure by the trigger signal does not exist.
4. Pulse Width Trigger Mode (Exposure Timing)
Note 1: The trigger signal that is less than or equal to 30 clocks is removed by the filtering system.
Note 2: The Input trigger signal has to be more than 31 clocks pulse width.
Note 3: The exposure starts
63
clocks after the rising edge of the trigger signal.
Normal mode
Exoposure time
Trigger mode
Normal mode
A u t o m a t i c a l l y s w i t c h e s t o
n o r m a l m o d e i f t h e p u l s e w i d t h
o f t h e t r i g g e r s i g n a l i s m o r e
t h a n 5 0 0 m s e c .
Note. 1
Function mode
Internal VD
CCD exposure
Trigger signal
(Positive)
Video out
Note. 3
WEN signal out
Note. 5
N e x t
V D
Note. 2
N e x t
V D
Note. 4
T1'
SUB
SG
(127 CLK)
Trigger
singal
Exposure
time
Exposure time: T1' = T1 + 127 CLK
T1
30 CLK
Filtering (Note.1)
