STV0680B Datasheet, PDF (6/63 Pages) STMicroelectronics – DUAL-MODE DIGITAL CAMERA CHIPSET

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 +
VReg
IR Filter
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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Version 3.4