PAC7312

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PixArt Imaging Inc.

V1.5 Oct. 2005

PAC7312 VGA PC Camera Single-Chip with Audio

General Description

The PAC7312 is a single chip with an embedded VGA CMOS image sensor and USB 1.1 interface. It has JPEG

image compression and image processing. The generic application is a PC camera. JPEG decoder and auto

exposure are performed by software in PC side. And the optical size is 1/4” which can easily be embedded in

LCD monitors, notebooks or PDA. It also provides high quality audio sampling function for sound recording. The

audio function complies with USB audio device class 1.0.

There are 4 IO-trapping pins with internal pull-low resistors. It is flexible for customers to set PID. It supports the

interface to a serial-EEPROM. When the EEPROM function is enabled, the internal control registers can be

power-up loaded from external EEPROM. This allows customization of VID, PID, product string.

Key Specification

Supply Voltage

5.0V ± 10%

Resolution

640 (H) x 480 (V)

Array Diagonal

4.48mm

Optical format

1/4“

Pixel Size

5.6um x 5.6um

Frame Rate

Up to 30fps

System Clock

12MHz

Color Filter

RGB Bayer Pattern

Scan mode

Progressive

Sensitivity

3.06 V/lux*sec

PGA gain

23.52dB (Max.)

S/N ratio

>45dB

Power consumption 65mA

Package

48-pin PLCC / 37-pin CSP

Features

VGA resolution, ~1/4”Lens

Frame rate up to 30fps at following resolution format

VGA format (640x480) with JPEG compression

CIF format (352x288) with JPEG compression

QVGA format (320x240) with JPEG compression

QCIF format (176x144) without compression

QQVGA format (160x120) without compression

RGB Bayer’s pattern raw data

Up to 3fps @VGA format (640x480)

Up to 12fps @CIF format (352x288)

Up to 12fps @QVGA format (320x240)

Up to 30fps @QCIF format (176x144)

Up to 30fps @QQVGA format (160x120)

Standard JPEG compression engine comply to ISO/IEC

10918-1(JPEG)

AEC/AGC/AWB automatic

4 IO-trapping pins to set USB PID

Support USB suspend mode

Support video data transfer through USB isochronous

transfer

Snapshot control through USB interrupt pipe

USB Vendor ID, Product ID, device release number and

the string descriptor index via a serial EEPROM

(93C46) or by metal mask

Complete

Universal

Serial

spec

V1.1

compatibility

Built in 8bits mono audio ADC for audio recording

through microphone, 16KHZ sampling rate, 8/16bits

PCM format

USB audio device class 1.0 compatibility

Ordering Information

Order number

Package Type

Package Size(mm)

PAC7312PE

48-pin PLCC

11.43 x 11.43

PAC7312CS

37-pin CSP

5.06 x 5.55