ICX282 データシートの表示（PDF） - Sony Semiconductor

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ICX282

Timing Generator for Frame Readout CCD Image Sensor

Sony Semiconductor 

CXD2498R

Control data/shutter data: [Electronic shutter]

The CXD2498R realizes various electronic shutter functions by using control data D13 SMD and D14 HTSG

and shutter data D10 to D19 SVD, D20 to D31 SHD 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 D13 SMD.

D13

Description of operation

0 Electronic shutter stopped mode

1 Electronic shutter mode

The electronic shutter data is expressed as shown in the table below using D20 to D31 SHD as an example.

However, MSB (D31) is a reserve bit for the future specification, and it is handled as a dummy on this IC.

MSB

D31 D30 D29 D28

X001

↓

1

D27 D26 D25 D24

1100

↓

C

LSB

D23 D22 D21 D20

0011

↓

3

SHD is expressed as

1C3H .

[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.

Symbol

SVD

SHD

SPL

Data

D10 to D19

D20 to D31

D32 to D41

Description

Number of vertical periods specification (000h ≤ SVD ≤ 3FFh)

Number of horizontal periods specification (000h ≤ SHD ≤ 7FFh)

Vertical period specification for high-speed shutter operation (000h ≤ SPL ≤ 3FFh)

Note) The bit data definition area is assured in terms of the CXD2498R functions, and does not assure the

CCD characteristics.

The period during which SVD and SHD 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, VD and HD periods, decoding value during the horizontal period, and other factors.

(Exposure time) = SVD + {(number of HD per 1V) – (SHD + 1)}

Concretely, when specifying high-speed shutter, SVD is set to “000h”. (See the figure.) During low-speed

shutter, or in other words when SVD 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 SHD can be considered as (number of SUB pulses – 1).

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