PixArt Imaging Inc.

PAW3501UI

USB Optical Mouse Sensor Single Chip

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3

PixArt Imaging Inc.

V2.1 April. 2008

2. Block Diagram and Operation

CMOS

IMAGE

SENSOR

DIGITAL

SIGNAL

PROCESSOR

POWER ON

RESET

USB MOUSE CONTROLLER

DEBUNCE

LED

DRIVER

D+

D-

OSCILLATOR

BR

B4

BL

BM

LED

VREFA

VREFB

VDD5V

OSCIN

OSCOUT

USB

INTERFACE

BUTTON

RESONATOR

VOLTAGE

REFERENCE

5V

POWER

B5

Z-AXIS

COUNTER

Z1

Z2

WHEEL

VSS

VDDQ

18 MHZ

VSSLED

SR

SR CTRL

CPI

CPI CTRL

DT

DT CTRL

Figure 3. Block Diagram

PAW3501UI supports X, Y, Z three axes, and L, R, M, B4, B5 five 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.

PAW3501UI is in a 24-pin optical package and comes with the resolution of 400/600/800 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. PAW3501UI can receive command and echo status or data format, both

complete Universal Serial Bus

solution to support USB Mouse.