STV-DCASLASHCIF-E01 datasheet(10/60 Pages) STMICROELECTRONICS

10 / 60 page

PRELIMINARY

Digital Camera Chipset; Customer Datasheet, Rev 3.0, March 2000

STV0680A + VV6444/6410/6500

CDSTV0680F-C

Commercial in confidence

STV0680F_contents.fm

Detailed features

2.1

Sensor type and image formats

The sensor type is auto-detected by STV0680A, which ensures that the correct sensor timing is enabled, and the correct image

resolutions are enabled, as shown in Table 4.

For stills photography, ‘High’ or ‘Low’ resolution mode can be selected, to give CIF or QCIF pictures from a CIF sensor, and VGA

or QVGA from a VGA sensor (see Table 4 and Section 3.7). Reduced resolution allows for storage of more images. Images

captured in both ‘High’ and ‘Low’ resolution can be stored in camera memory at the same time. Therefore there is no need for

images stored in memory to be cleared before changing image resolution.

Where USB is connected, the host PC software (through a Video for Windows driver) can activate tethered video mode,

regardless of the user inputs to the camera buttons. In this case, the image resolution is controlled by the PC driver..

2.1.1

VV6444

VV6444 is a CIF resolution, 5V CMOS imaging sensor. A brief specification is shown in Section 7. VV6444 has the same

functionality and array size as the un-microlensed VV6404 sensor, but has a microlensed array and different colour

characteristics. Although the VV64444 and VV6404 are electrically identical, the STV0680 and STV0680A use the correct

Sensor

Image Size

Resolution

mode

Final Image Size

Max. no. of

images

stored in

16MBit

memory

Max. no. of

images

stored in

64MBit

memory

Approximate

VfW framerate

(*)

VV6444/

6410

CIF 352 x 288

High

CIF 352 x 288

9 frames/sec

Low

QCIF 176 x 144

(Subsampled)

320

(see notes)

25 frames/sec

VV6500

VGA 640 x 480

High

VGA 640 x 480

(6)

2 frames/sec

Low

QVGA 320 x 240

(Subsampled)

(24)

106

12 frames/sec

Table 4 : Image modes supported (STV0680A-002)

*Notes:

1. VfW framerate is dependant on PC performance and USB bus loading

2. Not all image sizes are supported by all STV0680/680A variants - see Table 2 for clarification.

3. A CIF camera with STV0680A-002 and 64Mbit SDRAM can store up to 320 images by using QCIF mode. Where >99 images

are still available, the LCD display will remain at 99. Where (no. of images available) <99, the LCD display will show the

number of images available, as is the case with all other modes.

Sensor

Image

Size

Resolution

mode

Final Image Size

Max. no. of

images

stored in

16MBit

memory

VV6444

CIF 352 x

288

High

CIF 352 x 288

Low

QCIF 176 x 144

(Subsampled)

Table 5 : Image modes supported (STV0680-001)

STV-DCA/CIF-E01 数据表(PDF) 10 Page - STMicroelectronics

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