VL6522 datasheet(6/35 Pages) STMICROELECTRONICS

6 / 35 page

Overview

VL6522

6/35

1.4

Interface

1.4.1

USB

The details of the USB interface are summarized in

Table 2.

1.4.2

User customizing

Four special function port pins can allow PID/VID selections, support EEPROM (I2C

mastering) and customization for driving LED(s) and sensing switch or button states.

VID/PIDs can be programmed into EEPROM.

1.4.3

Video data standard

The video processing pipeline delivers fully reconstructed VGA (640 x480) color data

conforming to YUV 4:2:2 at up to 30 fps in accordance with video class specification

(Packed YUV Format - YUV2, GUID 32595559-0000-0010-8000-00AA00389B71).

1.4.4

Audio data standard

The audio processing pipeline delivers audio data (to 48 kHz, 16 bits) in accordance with

the audio class specification Type 1 (PCM, Pulse Coded Modulation, uncompressed). 16-bit

signed two’s-complement fixed point format (left-justified meaning the sign bit is the MSB).

The binary point is located to the right of the sign bit so that all values lie within the range

[-1 to +1].

1.4.5

Software

As the VL6522 is video/audio class, no software drivers are necessary to operate with

Windows operating systems from XP SP2 onwards.

A unified windows driver is available to allow operation under Windows 2000. This driver is

also compatible with Windows XP, XP64, Vista 32 and Vista 64. Although the driver is not

necessary for use with these operating systems, it does offer additional benefits to the user,

such as the face finding and tracking function, to keep the user's face in frame when video-

conferencing for example.

A linux driver is available to allow the VL6522 to be used with a linux based system.

Table 2.

Details of USB interface

Function

Description

Comments

Scope

Standard to which device

will comply

USB endpoints

Control

USB spec. rev2.0 HS

Control (default, audio, video)

Interrupt

(snapshot button, video class interrupt)

Video

USB video class rev1.0

Isochronous (video class data)

Audio

USB audio class rev2.0

Isochronous (audio class data)

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