STV-USB-VGA-R01 查看數據表（PDF） - STMicroelectronics

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STV-USB-VGA-R01

USB CIF/VGA Digital Camera Chipset

STMicroelectronics 

STV0672-chipsetf-3-1.fm

Introduction

2. Introduction

2.1 STV0672 Chipset General Description

The STV0672 is a digital video processor requiring no external RAM and minimum of passive support components to provide a

complete USB camera. STV0672 accepts raw digital video data from a CIF format CMOS sensor (VV6410) or from a VGA format

CMOS sensor (VV6500) and is capable of transferring the resulting YCbCr video data to a host PC over USB at rates up to 30

frames per second (CIF) or 15 frames per second (VGA).

The STV0672 architecture consists of a number of separate functional blocks:

• Video Processor (VP) to include interface logic to sensor

• Video Compressor (VC)

• USB control block

• General purpose control

The VP controls the VVVV6410/VV6500 sensor and processes the raw RGB pixel data into CIF or QCIF YCbCr images

This YCbCr data is compressed by the VC.

The USB control block transfers the compressed data to the host PC. System operation, responding to host requests and

commands as well as performing sensor exposure control and colour balance is handled by the video processor (VP).

2.2 Video Processor (VP)

2.2.1 Video Processor/Sensor Interface

The STV0672 video processor (VP) module provides formatted YCbCr 4:2:2-sampled digital video to the video compressor (VC)

module at frame rates up to 30 frames per second. The VP also interfaces directly to the VV6410/VV6500 image sensors. The

interface to the sensor incorporates:

• A 5-wire data bus SDATA[4:0] for receiving both video data and embedded timing references.

• A 2-wire serial interface SSDA,SSCL to control the sensor (allow reconfiguration of the sensor registers).

• The sensor clock SCLK.

• The sensor regulates the USB system power to 3V3 for both the sensor and the STV0672. The sensor requires one external

simple transistor in conjunction with the internal regulator to provide current drive to be able to successfully power the

complete camera system

• The sensor also provides a power-on-reset signal that is used to reset the STV0672. This power-on-reset signal also resets

the sensor.

• The module supports USB suspend mode.

The simplified block diagram shown below highlights STV0672’s key functional blocks.

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29 November 2000

Commercial in confidence

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