icx434 Sony Electronics, icx434 Datasheet - Page 18

• Manufacturer Part Number: icx434
• Description: Timing Generator For Frame Readout Ccd Image Sensor
• Manufacturer: Sony Electronics

Control data/shutter data: [Electronic shutter]
The CXD3615R realizes various electronic shutter functions by using control data D20 SMD and D21
HTSG and shutter data D10 to D19 SVR, D20 to D31 SHR and D32 to D41 SPL. These functions are
described in detail below.
First, the various modes are shown below. These modes are switched using control data D20 SMD.
The electronic shutter data is expressed as shown in the table below using D20 to D31 SHR as an example.
However, MSB (D31) is a reserved bit for the future specification, and is handled as a dummy bit on this IC.
[Electronic shutter stopped mode]
During this mode, all shutter data items are invalid.
SUB is not output in this mode, so the shutter speed is the accumulation time for one field.
[Electronic shutter mode]
During this mode, the shutter data items have the following meanings.
Note) The bit data definition area is assured in terms of the CXD3615R functions, and does not assure the
The period during which SVR and SHR are specified together is the shutter speed. An image of the exposure
time calculation formula is shown below. In actual operation, the precise exposure time is calculated from the
operating frequency, VR and HR periods, decoding value during the horizontal period, and other factors.
Concretely, when specifying high-speed shutter, SVR is set to "000h". (See the figure.) During low-speed
shutter, or in other words when SVR is set to "001h" or higher, the serial interface data is not loaded until this
period is finished.
The vertical period indicated here corresponds to one field in each drive mode. In addition, the number of
horizontal periods applied to SHR can be considered as (number of SUB pulses – 1). The readout period is
normally the horizontal period during which V1, V3A/B and V5A/B (for the ICX432) are ternary values, and SG
indicates these ternary level readout pulses.
MSB
D31
D20
X
Symbol
0
1
(Exposure time) = SVR
SHR
SVR
SPL
CCD characteristics.
D30
Electronic shutter stopped mode
Electronic shutter mode
0
1
D29
Shutter: D10 to D19
Shutter: D20 to D31
Shutter: D32 to D41
Description of operation
0
D28
1
+ (distance from SUB to SG during the readout period)
Data
D27
1
(1V period) + {(number of HR per 1V) – (SHR + 1)}
D26
1
C
D25
0
Number of vertical periods specification (000h
Number of horizontal periods specification (000h
Vertical period specification for high-speed shutter operation
(000h
D24
0
D23
SPL
– 18 –
0
D22
3FFh)
0
3
D21
1
Description
D20
LSB
1
SHR is expressed as 1C3h .
(1H period)
SVR
SHR
3FFh)
CXD3615R
7FFh)