CXD2434TQ View Datasheet(PDF) - Sony Semiconductor

Part Name

Description

Manufacturer

CXD2434TQ

Timing Generator for Progressive Scan CCD Image Sensor

Sony Semiconductor 

CXD2434TQ

2. Electronic shutter

<Shutter modes>

The electronic shutter has the following four shutter modes.

• Electronic shutter off:

Exposure time is 1/30 s.

• High-speed electronic shutter: Exposure time is shorter than 1/30 s.

• Low-speed electronic shutter: Exposure time is longer than 1/30 s.

• Flickerless:

Exposure time is 1/50 s. This is a special feature of the high-speed

electronic shutter, and reduces flicker from fluorescent lights, etc. in areas

with 50 Hz power supply

<Shutter mode and speed setting methods>

PS = Low: Serial input; set by the STRB, DCLK and DATA pins. The SMD1 and SMD2 pins are not used.

PS = High: Parallel input; set by the STRB, DCLK, DATA, SMD1 and SMD2 pins.

2-1. [Serial input]

Serial input is set by the STRB, DCLK and DATA pins. The electronic shutter mode and the meanings of the

numbers indicated by D0 to 9 vary according to the SMD1 and SMD2 setting of the internal register.

STRB

DCLK

DATA

SMD2 SMD1 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

SMD1

H

L

H

SMD2

H

H

L

Mode

Electronic shutter off (1/30 s accumulation)

High-speed electronic shutter

Low-speed electronic shutter

D0 to 9

—

Number of exposed lines (Note 1)

Number of exposed frames (Note 2)

Note 1) Relationship between the number of exposed lines and the exposure time

The relationship between the number of exposed lines and the exposure time is as follows.

(Exposure time) = (Number of exposed lines) x (One horizontal scan period) + (Accumulation time for

the readout lines)

In this formula, one horizontal scan period equals the HD falling interval, and the accumulation time for

the readout lines is the time from the rising edge of XSUB to the rising edge of XSG (456 bits). Also,

(Number of exposed lines) should be set to greater than 1 but less than 524.

Note 2) The number of exposed frames should be set to greater than 1 but less than 1023. However, when

the number of exposed frames is 1 and SMDE is set to high, external trigger mode does not function.

Timing Chart (Serial input)

STRB

DCLK

DATA

tWD

tSDS

tWS

tSDD

tHDD

—9—

Share Link: