PixArt Imaging Inc.

PAC7312

VGA PC Camera Single-Chip with Audio

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PixArt Imaging Inc.

V1.5 Oct. 2005

2. Block Diagram

USB

Controller

Regulator

PLL

Rate

Control

ASIC Register Bank

JPEG

Compression

Engine

Sensor Register Bank

EEPROM

Controller

Image

Processing

Engine

VGA

Sensor

Audio

Control

Interface

Audio

Analog

Circuits

PAC7312 is a single-chip USB camera. It includes a VGA sensor based on PixArt VGA sensor with

enhanced image quality and sensitivity, a 48MHz PLL, internal regulators, JPEG image compression,

image processing schemed, control registers, on-chip SRAM for image data buffer and USB

controller. All register parameters are set by USB interface. And the JPEG compressed image data is

transmitted by USB 1.1 isochronous pipe.