VV6501 datasheet(6/44 Pages) STMICROELECTRONICS

6 / 44 page

Introduction

STV0681

6/44

ADCS 7283313C

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.

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

Support for CIF resolution sensor - 352 x 288 pixels

Support for VGA resolution sensor - 640 x 480 pixels

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

26 picture storage capacity for VGA, with 64MBit memory

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.

Automatic anti-flicker exposure and gain control

Support for flashgun.

Figure 1: Typical camera system block diagram

CMOS Sensor

Sensor data

STV0681

USB interface

16MBit or 64MBit

SDRAM

Lens +

RS232

I/F

USB

I/F

memory

I/F

RS232 interface

GPIO

Sensor

I/F

PWM

LED

4.5 - 6v Battery e.g.

12MHz XTAL

Audio DAC

LCD

Driver

2x 7 seg. LCD

Push

Transceiver

Piezo

“Mode”

Buzzer

“Shutter

4-5v (Nominal) supply from Battery or USB

3-4 x AA, AAA, etc.

Power

Management

Circuit (Discretes)

Detect Low

Battery

to PC

Circuit (Discretes)

Sensor clock

IR Filter

VV6501 (VGA)

VV6411 (CIF)

Image Array

Audio

Pre-Amp

Speaker

Microphone

Comparator

Buttons:

/Record”

OEM Flashgun

Enable/Trigger

Module

Audio

Enable/Trigger

Flashgun

Amplifier

VReg

3v3 supply

Subject

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