kac-9638 ETC-unknow, kac-9638 Datasheet - Page 18

• Manufacturer Part Number: kac-9638
• Description: Kodak Kac-9638 Cmos Image Sensor
• Manufacturer: ETC-unknow

Functional Description
7.0
7.1
Two dedicated pins are provided on the KAC-9638, snapshot,
and extsync allowing the sensor to be externally controlled to
capture a single image. The snapshot input pin is used to trigger
a snapshot, while the extsync output pin is used to synchronize a
light source, strobe or mechanical shutter. Note that partial frame
integration is not possible in snapshot mode.
7.2
By default the sensor will operate in the VIDEO state (see figure
28). To take a snapshot, the snapshot mode must be enabled by
setting the SnapEnable bit in the SNAPMODE register to a logic
1. This will cause the sensor to enter the FREEZE state at the
end of the current frame. In the FREEZE state the sensor is idle.
The sensor will leave the FREEZE state and return to VIDEO
state when the snapshot mode is disabled (SnapEnable bit in the
SNAPMODE register set to a logic 0).
Alternatively when an active snapshot signal is applied to the
snapshot input pin an internal trigger signal, TRIGGER, is gener-
ated as shown in figure 28. The signal applied to the snapshot
pin must be longer then 1 frame. The trigger generation circuit
will create two types of TRIGGER as follows:
• Pulse Trigger (SnapshotMode bit of the SNAPMODE register
• Level Trigger (SnapshotMode bit of the SNAPMODE register
IMAGE SENSOR SOLUTIONS
KAC-9638
www.kodak.com/go/imagers 585-722-4385
c) Snapshot Integration
SnapShotPol
SnapShotMode
is cleared). In this mode (the default) a single TRIGGER pulse
will be generated.
is set). In this mode the TRIGGER will remain high as long as
the active level is held on the snapshot pin.
snapshot
b) Normal Mode
a) External Shutter Mode
SNAPSHOT MODE
Introduction
Taking a Snapshot
Figure 28. Snapshot Mode
c: SnapEnable
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Trigger
Circuit
Gen
row 1
snapshot
snapshot
extsync
extsync
TRIGGER
Last Array Reset
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(continued)
row 2
FREEZE
VIDEO
SNAP
Row 1 Integration Time
c:TRIGGER
c:SnapEnable
Figure 29. Snapshot Sequences
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programmable
programmable
Array reset,
Array reset,
row n
Row 2 Integration Time
18
Capture Image
When a TRIGGER is generated the sensor will enter the SNAP
state as shown in figure 28.
7.3
To take a snapshot in external shutter mode, the ShutterMode bit
of the SNAPMODE register must be set.
In this mode three consecutive operations will be carried out in
the SNAP state as follows (see figure 29):
• Array Reset, during which the extsync pin is kept in-active
• Image Capture, the extsync pin will activate. The width of the
• Array Read Out, the third and final operation reads the image
7.4
To take a snapshot in normal mode, the ShutterMode bit of the
SNAPMODE register must be cleared. In this case the following
consecutive operations will be carried out in the SNAP state (see
figure 29b and figure 29c):
• Array Reset, during which the extsync pin is kept in-active
• Image Capture, the extsync pin will activate and remain
• Array Read Out, the image data is read out one row at a time.
7.5
When read out is complete the sensor will return to the FREEZE
state.
7.6
If the snapshot mode is disabled before readout is complete
(SnapEnable bit in the SNAPMODE register is set to a logic 0),
then the sensor will return to the VIDEO state at the end of read-
out.
and the array is reset one row at a time. The number of times
the array is reset is programmable from 1-8 frames, (see the
SsFrames bits in the SNAPMODE register).
extsync signal can be programed from 0 to 32767 lines by pro-
gramming the snapshot integration time registers, SNAPITH
and SNAPITL.
data out one row at a time.
and the array is reset one row at a time. The number of times
the array is reset is programmable from 1-8 frames, (see the
SsFrames bits in the SNAPMODE register).
active for the duration of the capture time. The length of the
capture time can be programed from 0 to 32767 lines by pro-
gramming the snapshot integration time registers, SNAPITH
and SNAPITL.
During this operation the extsync pin remains active.
SnapIT
The SNAP State in External Shutter Mode
The SNAP State in Normal Mode (default)
Return to the FREEZE State
Return to the VIDEO state
Row n Integration Time
Capture
Capture
image
image
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read-out
read-out
Data
Data
row 1
Data Read Out
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row 2
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row n