ICX252 データシートの表示（PDF） - Sony Semiconductor

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ICX252

Timing Generator and Signal Processor for Frame Readout CCD Image Sensor

Sony Semiconductor 

CXD3406GA

Control data: [AF drive]

The CXD3406GA controls the drive of the vertical cut-out area of the line in AF1/AF2 mode by using control

data D16 to D23 CDAT. This mode has a function on purpose to raise frame rate for auto focus (AF), and

cannot support operation such as electrical image stabilization.

The AF drive bits are loaded to the CXD3406GA and reflected at the falling edge of VD. As shown in the figure

below, first, the fixed stage is swept at high speed, and it goes to readout period and vertical OB period. Then

normal transfer is performed equivalent to draft mode from the frame shift to the stage specified by the serial

interface data to the timing of the falling edge of the next VD.

Therefore, the number of frame shift stages applied to CDAT and the control by VD period are conditions for

its application.

VD

High-speed sweep

V1A

Vck

MODE

0

CDAT

00h

Normal transfer Frame shift

4

0

FFh

00h

The number of high-speed sweep are different according to the selected mode. They are specified as follows.

AF1 mode: 138 stages (0 to 7H)

AF2 mode: 208 stages (0 to 11H)

The frame shift data is expressed as shown in the table below using D16 to D23 CDAT.

MSB

LSB

D23 D22 D21 D20 D19 D18 D17 D16

01101001

↓

↓

6

9

CDAT is expressed as 69h .

Its definition area is specified as follows.

AF1 mode: 00h ≤ CDAT ≤ FFh (11 to 23H)

AF2 mode: 00h ≤ CDAT ≤ FFh (14 to 27H)

– 24 –

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