STV0680 データシートの表示（PDF） - STMicroelectronics
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STV0680 Datasheet PDF : 63 Pages
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Detailed features
2 Detailed features
STV0680B + VV6444/6410/6500
2.1
Note:
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.
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.
Sensor
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)
High
CIF 352 x 288
20
80
15 frames/sec.
VV6444 CIF 352 x 288
QCIF 176 x 144
Low
(Subsampled)
322
80
25 frames/sec.
(see Note 3)
VV6410/
6411
CIF 352 x 288
High
Low
CIF 352 x 288
QCIF 176 x 144
(Subsampled)
20
80
15 frames/sec.
322
80
22.5 frames/sec.
(see Note 3)
High
VGA 640 x 480
(6)
26
2 frames/sec.
VV6500 VGA 640 x 480
QVGA 320 x 240
107
Low
(26)
12 frames/sec.
(Subsampled)
(see Note 3)
Table 3 : Image modes supported (STV0680B-001)
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.
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Version 3.4
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