CXD1254AR Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

Fabricante

CXD1254AR

CCD Camera Synchronization and Timing Signal Generator

Sony Semiconductor 

CXD1254AR/AQ

Electronic Shutter Description

Pins for Shutter

PS, TRIG, ENB

Inputs for overall mode setting

XSUB

Output

ED0, ED1, ED2

Inputs for shutter speed setting

(Note)

• Regardless of shutter speed setting controlled by PS, ED0 to ED2, and TRIG, if ENB is “Low”, the shutter

will be OFF.

• The speed set by PS and ED0 to ED2 is subject to control by TRIG.

Mode Description

1. TRIG (Pull-up resistor)

• For normal shutter operation, TRIG should be either left Open or set at High.

• For continuous variable shutter operation, input a clock pulse to TRIG.

VD

HD

XSGI

TRIG

XSUB

Shutter speded

By taking out XSUB pulses between downward pulses of XSG1 and TRIG, and thus stopping XSUB pulses

from the downward pulse of TRIG to the following downward pulse of XSG1, the shutter speed is determined.

In order to increase the range of control when the TRIG pin is used to control the shutter speed, Pins ED0 to

ED2 (described in next section) must be pre-set to 1/10000 sec. (Described in later section.)

2. ED0, ED1, and ED2 (Shutter speed control)

PS (Selects between parallel/serial input)

ENB (Shutter mode selection)

2-1. PS

Selects either parallel or serial input data format to be used for determining shutter speed.

• Parallel input

Combination of the 3 bits, ED0, ED1, ED2, yields 8 possible shutter speed settings.

• Serial input

Shutter speed is determined by inputting ED0 (strobe), and ED1 (clock), and ED2

(data) to respective pins.

—8—

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