STV0680 datasheet(10/63 Pages) STMICROELECTRONICS

10 / 63 page

Detailed features

STV0680B + VV6444/6410/6500

10/63

Version 3.4

Detailed features

2.1

Sensor type and image formats

The sensor type is auto-detected by STV0680B, which ensures that the correct sensor timing is

enabled, and the correct image resolutions are enabled, as shown in

Table 3.

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 3). 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.

Note:

When tethered VfW video (PC) or Quicktime driver (Mac) is activated, all images or recorded

sounds or video clips will be deleted from the camera SDRAM. A software solution is available

(“Camera control”, as part of the SDK for PC, and “Plug’n Save” for Mac) which can monitor

whether a camera is connected and will warn the user if activating the VfW driver will cause SDRAM

contents to be deleted.

Note: 1 VfW framerate is dependent on PC performance and USB bus loading

2 On a camera using STV0680B-003, the number of images which can be stored is reduced if Audio

sounds have been recorded on the camera or if custom sounds have been downloaded from the

PC to the camera. The reduction of capacity depends on the length of audio clip, but a rough guide

is that if 1 CIF image uses the same amount of SDRAM as 10sec of audio, and one VGA image

uses the same amount of SDRAM as 30 sec. of audio.

Sensor

Image Size

Resolution

mode

Final Image Size

Max. no. of

images

stored in

16MBit

memory

(

Note 2)

Max. no. of

images

stored in

64MBit

memory

(

Note 2)

Approximate

VfW framerate

(

Note 1)

VV6444

CIF 352 x 288

High

CIF 352 x 288

15 frames/sec.

Low

QCIF 176 x 144

(Subsampled)

322

(see

Note 3)

25 frames/sec.

VV6410/

6411

CIF 352 x 288

High

CIF 352 x 288

15 frames/sec.

Low

QCIF 176 x 144

(Subsampled)

322

(see

Note 3)

22.5 frames/sec.

VV6500

VGA 640 x 480

High

VGA 640 x 480

(6)

2 frames/sec.

Low

QVGA 320 x 240

(Subsampled)

(26)

107

(see

Note 3)

12 frames/sec.

Table 3 : Image modes supported (STV0680B-001)

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