DVC DigitEyes Series, Technical Manual, Page: 19 / 66

14
5.3 PULSE DRIVEN INTEGRATION MODE:
For integration periods greater than 1/1000 sec, the following process (called Pulse Driven
Integration) is followed. The camera operates in the standard mode (Integration Period = 1/60
sec) as long as all the mode control pins are High. Due to internal pull-up resistors, this is the
default mode.
If the Integration mode is selected (see mode selection table), then the falling edge of the
RESET input (pin 17 of the DB-37 connector) signal initiates the INTEGRATION MODE
sequence.
INTERRUPTED FIELD M FIELDS
Interrupted Field
Integration Mode
INTEGRATION PULSE
M * 1/60s
FIELD (N-2)
1/60 sec
READOUT FIELD (N)
1/60 sec
(N+1)
1/60 sec
(N-1) INT (N+2)
1/60 sec
Video
Sync
Readout (N) EVEN FIELD
Integrated Im age
INTEGRATION PERIOD = DURATION OF PULSE - CCD FLUSH PERIOD
TRANSFER PULSE
CCD FLUSH PERIOD
Reset
Video Blanked
Enable Frame Enable Frame Enable Frame
Enable Frame
Enable Line Enable Line Enable Line
Enable Line
Video Blanked
Figure 5-3: Pulse Driven Integration Mode
The CCD is flushed by means of two quick, successive transfers. This takes approximately
140
µ
sec. At the end of this period, the Integration Period begins.
When the RESET signal returns HIGH (rising edge), a vertical reset is generated. This resets the
Vertical Counter in the Camera; image transfer and readout begin immediately.
The total integration time is therefore can be computed as follows:
T
int
= (Duration of the Low RESET pulse) - (CCD flush period)
OR
T
int
= (Duration of the Low RESET pulse) - 140
µ
sec