STV0680 datasheet(14/63 Pages) STMICROELECTRONICS

14 / 63 page

Detailed features

STV0680B + VV6444/6410/6500

14/63

Version 3.4

audio record and “delete last” functions into the user interface. The audio sample rate is 11.025kHz,

and the signal is digitised using a successive approximation A-D converter with 8 bits resolution.

The SDRAM stores 1 second of Audio recording per 11k Bytes of memory.

2.4.2

Playback

A camera which includes STV0680B-003 and an amplifier, speaker/headphone socket, and other

periphery, can be used to playback sounds which were either recorded on the camera or

downloaded from the PC.

The quality of Audio playback is largely dependant on the type of speaker used, and on the correct

mounting of the speaker in the camera plastics.

2.5

PC interface options and software support

Either USB Interface (full speed 12Mbit/sec. max.) or RS232 interface (115.2Kbaud) is supported

by the chipset, with driver software available from ST for both. The interface type is auto-detected

by the chipset. PC software can be one of the following:

Simple image upload demonstration software supplied by ST, allowing uploading of stills or

‘continuous’ images. This software should not be supplied as an end-user product.

TWAIN driver to suit all TWAIN compatible imaging applications

Video for Windows driver for tethered video mode (USB only)

Custom end-user software developed by OEM using SDK (for SDK availability, contact ST).

The SDK is supplied by ST as a 32-bit DLL format, running on Windows 98, and accessed

through a documented software interface. This provides the basis for developing a custom

software application for uploading stills and/or video.

2.5.1

USB

Complete images (displayed as either thumbnails or in full resolution), or the entire SDRAM

contents (e.g. for uploading continuously captured image sequences, recorded using ‘Continuous

Capture’ mode) can be downloaded through USB, and USB connection also allows for tethered

video mode to be activated by the USB driver.

Thumbnail image download is extremely fast for the entire memory contents in the camera. Once a

picture is selected for download, full image download takes approximately 0.15 seconds per image

for a CIF image (0.6 seconds for a VGA image), plus post processing time per image.

For USB interface details, see

Section 4.4.

Note:

Actual USB download and post processing time also depends on PC performance and USB bus

2.5.2

RS232

Thumbnails of images, complete stored images, or the entire SDRAM contents can be downloaded

through RS232, but tethered video is not supported.

Once a picture is selected for download, full image download takes approximately 10 seconds per

image for a CIF image (around 30 seconds for a VGA image), plus post processing time per image

(of the order of 1 second approximately).

For RS232 interface details, see

Section 4.5.

Note:

Actual post processing time after RS232 download also depends on PC performance

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