PixArt Imaging Inc.

PAW3502

USB Optical Mouse Sensor Single Chip

2. Block Diagram and Operation

CMOS

IMAGE

SENSOR

DIGITAL

SIGNAL

PROCESSOR

POWER ON

RESET

USB MOUSE CONTROLLER

DEBUNCE

LED

DRIVER

D+

D-

OSCILLATOR

BR

BL

BM

LED

VDDA

VDD5V

OSCIN

USB

INTERFACE

BUTTON

RESONATOR

VOLTAGE

REFERENCE

5V

POWER

Z-AXIS

COUNTER

Z1

Z2

WHEEL

VSS

VDDQ

24 MHZ

OSCOUT

Figure 3. Block Diagram

The PAW3502 supports X, Y, Z three axes, and L, R, M three buttons under USB mode. It is a CMOS process

optical mouse sensor single chip with USB interface that serves as a non-mechanical motion estimation engine

for implementing a computer mouse.

The PAW3502 is in a 14-pin optical package and comes with the resolution of 400/800/1000/1200 counts per

inch (CPI) and the rate of motion up to 28 inches per second. It includes USB interface so that no mouse

controller is needed to interface through USB. The PAW3502 can receive command and echo status or data

format, both complete Universal Serial Bus

effective solution to support USB Mouse.

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PixArt Imaging Inc.

V0.2 Dec. 2006

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