July 2003
ADCS 7269750C
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STV0674
Tri-mode CMOS digital camera co-processor
Description
The STV0674 is a flexible, scalable digital camera
co-processor for use with the range of CMOS
imaging sensor products from STMicroelectronics.
The same chipset can be used for a wide range of
digital imaging products with unique features and
price/performance points.
The STV0674 is designed for use with CIF
(352x288) or VGA (640x480) ST CMOS image
sensors and provides full exposure control, color
processing and mode control for these sensors.
The STV0674 can be used to implement any of the
following products:
Low cost USB Webcam Camera - a two-chip
solution providing up to 30 frames per second VGA
simultaneous video and audio capture.
Dual-Mode Camera - USB webcam and CIF or
VGA digital still camera in a single product.
Tri-Mode Camera - USB webcam and digital still
camera with the addition of a `camcorder' mode to
allow simultaneous video and audio capture directly
to external memory for later upload to the PC.
Features
s
VGA or CIF CMOS sensor support
s
Hardware color processing and JPEG
compression of image data
s
Still image capture
s
Tethered video operation over USB
q
Simultaneous video and audio capture
s
USB
q
USB for PC and MacOS (in development)
s
Flexible external memory options
q
SDRAM for lower cost, (8 or 16 bit)
q
FLASH for non volatile storage (Data + Code)
q
Smartmedia Card for removable data storage
q
EEPROM for code storage
s
Record simultaneous video and audio direct
to memory while untethered
s
Drivers for PC operating systems Win98,
WinME, Win2K and WIn XP.
Application Block Diagram
LCD Image Display
NAND
FLASH
LCD Icon Display
SmartMedia
Flash card
SOCKET
SDRAM
x16 or x8
Audio Playback
POWER
AMP
Buzzer
5
USB
Interface
Memory
Processor
Microphone
to Host PC
OR
Video
Processor
Video
Compression
Micro
Audio
Interface
USB Cable
Removable
OR
STV0674 100TQFP
User Interface
Buttons/ Switches
Image
Array
+
BOOT
EE-
-PROM
LCD
Driver
Chip
LCD
Driver
Chip
STMicroelectonics
CMOS Sensor
GPIO
Flashgun
Module
OEM
Hardware Enabled
Firmware enabled
STV0674
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Table of Contents
Chapter 1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1
Webcam Mode ..................................................................................................................... 5
1.2
Dual-Mode (Webcam plus Digital Still Camera) ................................................................... 5
1.3
Tri-Mode (Webcam plus Digital Still Camera plus Digital Movie/Audio Recorder) ............... 5
Chapter 2
STV0674 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1
Sensor interface ................................................................................................................... 6
2.2
Video processor ................................................................................................................... 6
2.3
Video compressor ................................................................................................................ 6
2.4
Microcontroller ...................................................................................................................... 7
2.5
Memory interfaces ................................................................................................................ 7
2.6
Audio record ......................................................................................................................... 8
2.7
Audio playback ..................................................................................................................... 8
2.8
USB PC interface ................................................................................................................. 8
2.9
Power requirements ............................................................................................................. 8
Chapter 3
STV0674 Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.1
Webcam with audio .............................................................................................................. 9
3.2
Tri-mode camera ................................................................................................................ 10
Chapter 4
Detailed Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.1
Absolute maximum ratings ................................................................................................. 11
4.2
DC characteristics .............................................................................................................. 11
4.3
SDRAM interface ............................................................................................................... 13
4.4
NAND flash interface .......................................................................................................... 15
4.5
USB interface ..................................................................................................................... 20
4.6
Audio .................................................................................................................................. 21
4.7
SFP AC parameters ........................................................................................................... 22
4.8
Sensor interface ................................................................................................................. 22
4.9
Device current consumption in run and suspend modes ................................................... 23
Chapter 5
Pinout and Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
5.1
Device pinout ..................................................................................................................... 24
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STV0674
5.2
Pin description .................................................................................................................... 26
5.3
Package outline and mechanical data ............................................................................... 31
5.4
External circuits .................................................................................................................. 32
Chapter 6
Evaluation Kit and Reference Design Manuals . . . . . . . . . . . . . . . . . . . . . . . . .33
6.1
Evaluation kit ...................................................................................................................... 33
6.2
Reference design manuals ................................................................................................ 33
Chapter 7
Ordering Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
STV0674
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Revision History
Revision
Date
Changes
A
03/10/2001
Initial release
B
16/08/2002
Expansion of AC /DC specifications section 7
Added Figures 11 and 14, "Signals identified by functional group"
Detail added to
Table 10
, pull down on SFP 19 required
Detail added to
Table 10
, pull down on SFP 14 required
C
17/04/2003
Deletion of any reference to 64TQFP package.
26/05/2003
DC charascteristics - Changed value for I/O high power current: 2 mA
instead of 5.7 mA previously.
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STV0674
Overview
1
Overview
The STV0674 can be used to implement 3 different low-cost CMOS camera products as detailed
here below.
1.1
Webcam Mode
STV0674 allows a two-chip solution to provide a USB webcam, which can acquire and display
images on the host system at frame rates of up to 30fps VGA. The addition of an external
microphone allows simultaneous audio acquisition. Custom drivers require an additional low cost
EEPROM which allows USB parameters such as Vendor ID /Product ID to be customised.
1.2
Dual-Mode (Webcam plus Digital Still Camera)
While retaining all the features of the webcam, the addition of external storage memory allows the
functionality of a digital still camera. On-chip JPEG compression permits high-density picture
storage.
16Mbit to 128Mbit of SDRAM (8 or 16 bit) and/or 32Mbit to 1Gbit NAND flash memory are
supported by the device. Also supported are the popular Smart Media Cards (SMC) to extend non-
volatile storage capability. The wide range of memory support allows the camera builder to tailor the
system cost to suit their target market.
A continuous image acquisition mode allows untethered (no host connection) video clips to be
taken. As an example, with 15:1 compression ratio and 128Mbit memory over two minutes (QVGA
@10fps) worth of video can be stored and up-loaded for display on the host.
Full Direct Show driver support for Windows 98SE, ME, Windows 2000, Win XP is available.
MacOS is currently in development.
1.3
Tri-Mode (Webcam plus Digital Still Camera plus Digital Movie/Audio
Recorder)
Again, retaining the features of the dual mode camera, the inclusion of audio record and playback
circuitry adds another dimension to the product. An in-system microphone allows audio to be
recorded and played back either via a speaker on the camera or via the host sound system. Audio
can either be recorded simultaneously with video (camcorder) or independently of image acquisition
(dictaphone). Audio data can also be downloaded from the host and played back on the camera
when events take place. This allows any sampled soundbites to be played back on cameras, as
opposed to the normal beeps from traditional cameras, which offers many possibilities for language
customisation or licensed "character" cameras.
As well as the memory and audio options already described, the GPIO and firmware emulation
make it possible to support other custom peripherals such as icon or area displays.
Other custom peripherals such as icon or area displays can be support via uncommitted general
purpose I/O under firmware control.
ST Microelectronics provides a software development kit (SDK) allowing OEMs to create custom
PC applications, and an OEM pack to modify drivers to their specific requirements.
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