PixArt Imaging Inc.

PAN3501UI

USB Optical Mouse Sensor Single Chip

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PixArt Imaging Inc.

V1.0, APR. 2005

2. Block Diagram and Operation

CMOS IMAGE SENSOR

DIGITAL

SIGNAL

PROCESSOR

POWER ON

RESET

USB MOUSE CONTROLLER

LED

DRIVER

D+

D-

OSCILLATOR

BR

B4

BL

BM

LED

VREFA

VREFB

VDD5V

OSCIN

OSCOUT

USB

INTERFACE

BUTTON

RESONATOR

VOLTAGE

REFERENCE

5V

POWER

B5

Z1

Z2

WHEEL

VSS

VDDQ

18MHZ

VSSLED

PAN3501UI 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.

PAN3501UI 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 include USB interface so that no mouse

controller is needed to interface through USB. PAN3501UI can receive command and echo status or data

a cost effective solution to support USB Mouse.

Figure 3. Block diagram