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VV6500C001 Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer VV6500C001
Beschreibung DUAL-MODE DIGITAL CAMERA CHIPSET
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 30 Seiten
VV6500C001 Datasheet, Funktion
® STV0680B+ VV6410/6411/6500
DUAL-MODE DIGITAL CAMERA CHIPSET
DESCRIPTION
STMicroelectronics Imaging Division has enhanced
the feature set of the STV0680B low cost dual-
mode camera chipset to allow a new line of low cost
cameras or toy products to be brought to the
market.
STANDARD FEATURES
ST have maintained the standard features already
available in the successful STV0680B-001 chipset,
including:
q STV0680B-003 fully backward compatible
with STV0680B-001
q Support for VV6410/6411 (CIF) and VV6500
(VGA) CMOS imaging sensors.
q Support for SDRAM sizes 16MBit (up to 20
CIF images) or 64Mbit (up to 80 CIF or 26
VGA images).
q Low resolution “economy” mode allows for
more images to be stored.
q High frame rate web cam (tethered video)
over USB.
q Automatic anti-flicker exposure control.
q Image up load over RS232 or USB.
q Driver support for Win98/Win2k/WinME and
MacOS 8.6/9.0/9.1.
q Continuous capture while untethered (except
when Flashgun enabled) and downloading to
AVI file format
q Power-saving “stand-by” mode which
maintains memory contents, as well as
generally low power consumption.
q Simple user interface including 2 buttons,
status LCD display, and buzzer.
q Evaluation Kit (EVK) available.
q Software Development Kit (SDK) allows OEM
PC Software applications to be written.
NEW FEATURES AVAILABLE IN STV0680B-003
q Audio record/playback and “Delete Last”
function
q Custom sounds playback (e.g. “Talking” or
“Musical” camera)
q Flashgun support
q Quick Power Down (by holding Mode
Button).
Audio Record And Playback
The enhanced features included in STV0680B-003
allow audio memos to be recorded, stored in
SDRAM, and uploaded to the PC over USB or
RS232, to be played back using an OEM software
application developed using the SDK
With the addition of playback hardware, recorded
audio sounds can also be played back on the
camera, and it is possible to download a set of
custom sounds from the PC to allow (e.g.) shutter
“Click-Whirr”, or for a “Talking Camera”. This has
limitless possibilities for OEM language
customising or licensing.
Flashgun Support and “Delete Last” Function
STV0680B-003 includes flashgun support for an
OEM flashgun module. An additional user interface
function is available in STV0680B-003 which allows
the user to delete the last image, continuous clip or
audio memo which was captured or recorded.
Evaluation Kit and Reference Design
Evaluation kits are available for both standard
features and enhanced STV0680B-003 features.
Precise design guidelines are available from ST as
a separate STV0680B Reference design manual
(see Chapter 12).
Note: Simultaneous audio record and
continuous video capture is not possible.
September 2001
Version 3.4
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VV6500C001 Datasheet, Funktion
Introduction
1 Introduction
STV0680B + VV6444/6410/6500
1.1 Digital camera chipset
This document describes the features and functionality of a CMOS chipset, comprising an
STMicroelectronics (ST) CIF or VGA resolution sensor and an STV0680B companion processor
(DCA1), as well as outlining what peripheral components are required/supported in order to
complete a camera using the chipset. Such a camera is particularly suited to dual-mode digital stills
or toy applications.
In stills mode, the camera stores raw image data in memory. The camera carries out no colour
processing, ensuring its simplicity and low cost. Subsequent download of raw data to a PC or
Macintosh for processing is done through an RS232 or USB interface, through demo software, a
TWAIN driver, or OEM custom application. The license to use the colour algorithm (embedded in
the PC or Mac driver software) is included in the price of the chipset.
A video option is provided, when tethered through USB, which can allow for Video for Windows
applications, and ‘video clips’ can be recorded while untethered by continuously capturing images
while in ‘Continuous’ mode, then downloaded to the PC for playback, using software to create an
AVI file.
Using STV0680B-003, the firmware also includes the capability to trigger a flashgun module
through a two wire interface (enable input and trigger output), and the capability to record audio
sounds into the SDRAM, for subsequent upload to the PC, or to replay audio sounds which have
either been recorded on the camera or dowloaded from the PC (stored on the PC as.WAV files).
Precise design guidelines are available from ST as a reference design (see Section 4). A software
development kit (SDK) for PC is available from ST, to interface to the camera and provide the basis
for developing a custom software application for stills and/or video, which includes colour
processing software as object code.
CMOS Sensor
Audio
Speaker
Amplifier
Push
LED Flashgun
Enable/Trigger
Buttons:
“Mode”
“Shutter
/Record”
OEM Flashgun
VV6410/6411(CIF)
VV6500 (VGA)
Module
Enable/Trigger
Audio
Pre-Amp
Image Array
Microphone
Comparator
Sensor data
Sensor clock
Piezo
Buzzer
GPIO
LCD memory
Driver I/F
Audio DAC
Sensor
I/F
PWM
RS232
I/F
STV0680B
USB
I/F
Detect Low
Battery
Subject
Lens +
IR Filter
VReg
12MHz XTAL
3v3 supply
4-5v (Nominal) supply from Battery or USB
2 x 7 seg. LCD
16MBit or 64MBit
SDRAM
Transceiver
Circuit (Discretes)
RS232 interface
to PC
Power
Management
Circuit (Discretes)
USB interface
to PC
4.5 - 6v Battery e.g.
3-4 x AA, AAA, etc.
Figure 1 : Typical camera system block diagram
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VV6500C001 pdf, datenblatt
Detailed features
STV0680B + VV6444/6410/6500
1 Mode button (Wake-up/Switch between modes): This button allows the user (1.1) to wake the
camera up from standby mode when the camera is to be used for taking pictures, or (1.2) to
switch between modes of operation shown in Chapter 3.
2 Shutter button (Shutter/confirm action): This button allows the user to take a picture or confirm
an action, as shown in Chapter 3
The modes of operation are described in Chapter 3.
It may also be desirable to include an on-off slider switch. This has advantages and disadvantages,
and its exact function is discussed further in the reference design available from ST.
Where a flashgun module is included in the camera, it will be necessary to include a flash on/flash
off push button or slider switch, dependant on the exact flashgun module design. possible
implementations are discussed in a separate application note AN1312 regarding flashgun
implementation, available from ST.
2.2.2 LED indicator
An LED display camera status, i.e. to show that the camera is not in Standby/PC suspend mode.
2.2.3
Note:
Picture counter using 2 x 7 segment display
STV0680B stores a picture counter value, which shows how many images can still be captured.
STV0680B supports a 2x7 segment LCD panel. In ‘Snapshot’ mode and continuous capture mode,
this LCD panel displays the number of pictures still available, which is useful to identify when the
user is approaching the maximum number of images which can be stored (see Table 3). It is
possible to clear the images stored in memory, in order to continue taking pictures. In other modes,
this LCD panel shows displays a 2-character code, which helps the user to navigate around the
modes.
A CIF camera with STV0680B 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.
For suitable numeric LCD panel types, see Section 4.8.
2.2.4
Piezo buzzer
An on-chip Pulse Width Modulator (PWM) on STV0680B is used to generate buzzer sounds to
signal certain events. The following are typical of the type of events which are indicated by the
buzzer, and each has its own distinctive sound:
1 Camera has been ‘Woken up’ from standby mode (either by the user pressing a button, by re-
connecting the power source, or by connecting a USB/RS232 connection).
2 Camera has been ‘gone to sleep’ i.e. moved into standby mode. Pictures are retained in
memory.
3 Picture has been successfully taken after the user presses the capture button.
4 Picture has NOT been taken after the user presses the capture button. This indicates to the
user that there is insufficient light, or that the exposure control was not ready due to a rapid
change of lighting in the scene.
5 Picture has NOT been taken after the user presses the capture button, due to picture counter
having reached the maximum number of images. The user has the chance to zero the counter
if desired.
6 End of continuous capture in un-tethered ‘Continuous’ mode, due to memory full.
7 Self-timer activated and counting down.
12/63
Version 3.4

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