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VV6411C036

DUAL-MODE DIGITAL CAMERA CO-PROCESSOR

STMicroelectronics 

Introduction

STV0681

1.1.6

“Delete Last” function

An additional user interface function is available in STV0681 with either audio record or playback

hardware fitted. With these, the user can delete the last image or continuous clip to be captured, or

the last audio memo to be recorded. The standard “Clear all” (“CL”) function remains, whether or not

audio hardware is fitted.

1.1.7

Backward compatibility with STV0680B

STV0681 is electrically and functionally compatible with cameras designed for STV0680B, and uses

the same PC/Mac drivers, however the change of device pinout means that some PCB re-design

will be required.

Precise design guidelines are available from ST as a reference design (see Chapter 10). A software

development kit (SDK) for PC is available from ST to interface to the camera and provide the basis

to develop a custom software application for stills and/or video. It includes colour processing

software.

Figure 1: Typical camera system block diagram

CMOS Sensor

Audio

Speaker

Amplifier

Push

LED Flashgun

Enable/Trigger

Buttons:

“Mode”

“Shutter

/Record”

OEM Flashgun

VV6411 (CIF)

VV6501 (VGA)

Module

Enable/Trigger

Audio

Pre-Amp

Image Array

Microphone

Comparator

Sensor data

Sensor clock

Piezo

Buzzer

GPIO

LCD memory

Driver

Audio DAC

I/F

Sensor

I/F

PWM

RS232

I/F

STV0681 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.

1.2 Key system features

The key features of a typical camera based on the STV0681 chipset are listed here below.

1.2.1 Image features

q Support for CIF resolution sensor - 352 x 288 pixels

q Support for VGA resolution sensor - 640 x 480 pixels

q 80 picture storage capacity possible for CIF, with 64MB memory

q 26 picture storage capacity for VGA, with 64MBit memory

q A greater number of images can be stored when ‘Low’ resolution mode is enabled (e.g. 80 QCIF

images with 16Mbit memory, 107 QVGA images with 64Mbit memory). See Table 1.

q Automatic anti-flicker exposure and gain control

q Support for flashgun.

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ADCS 7283313C

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