CXD1261 데이터 시트보기 (PDF) - Sony Semiconductor

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CXD1261

Sync Signal, Timing Signal Generator for CCD Cameras

Sony Semiconductor 

CXD1261AR

Electronic Shutter Description (During frame accumulation, low-speed shutter does not operate normally.)

The XSUB pulse timing changes according to the electronic shutter control described below. In addition, the

ENB pin controls whether the XSUB pulse is output or not; this control has priority.

1. Continuously variable shutter (trigger mode)

• When using the normal shutter, either leave the TRIG pin open or connect it to the power supply.

• When using the continuous variable shutter, input the clock pulse to the TRIG pin.

VD

HD

XSG1

TRIG

XSUB

Shutter speed

The shutter speed is determined by sampling the XSUB pulse during the interval between the falling edge of

XSG1 and the falling edge of TRIG, and then stopping the XSUB pulse during the interval between the falling

edge of TRIG and the next falling edge of XSG1.

When using the TRIG pin to control the shutter speed, in order to broaden the control range it is necessary to

use the ED0, 1, and 2 pins (described later) to set the shutter speed to 1/10000.

2. Normal shutter

2-1. Switching between parallel input and serial input

Parallel input or serial input can be selected as the method for inputting the data used to determine the shutter

speed.

• Parallel input (PS = High):

Permits selection of eight shutter speeds by using three bits ED0, ED1, and ED2.

• Serial input (PS = Low):

Shutter speed is determined by inputting the strobe to ED0, CLK to ED1, and the data to ED2.

–8–

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