PixArt Imaging Inc.

PAN3401

PS/2 Optical Mouse Single Chip

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PixArt Imaging Inc.

V1.3, Mar. 2008

2. Block Diagram and Operation

DIGITAL

SIGNAL

PROCESSOR

POWER ON

RESET

LED

DRIVE

CLOCK

DATA

OSCILLATOR

LED

VREF

VDD

PS/2

INTERFACE

VOLTAGE

REFERENCE

5V POWER

VSS

CMOS IMAGE

SENSOR

INTERNAL

OSC_RES

PS/2 MOUSE CONTROLLER

Z1

Z2

WHEEL

BR

BL

BM

BUTTON

Figure 3. Block Diagram

The PAN3401 is a CMOS process optical mouse sensor single chip with PS/2 interface that serves as a non-

mechanical motion estimation engine for implementing a computer mouse. It is based on new optical navigation

technology, which measures changes in position by optically acquiring sequential surface images (frames) and

mathematically determining the direction and magnitude of movement. The sensor is in a 12-pin optical package

and comes with the resolution of 400/800/1000 counts per inch (CPI) and the rate of motion up to 28 inches per

second. It is also featured crystal-less (Internal ± 10% accurate oscillator) to save customer’s BOM cost. The

PAN3401 includes PS/2 interface so that no mouse controller is needed to interface through PS/2. The PAN3401

can receive command and echo status or data format which are compatible with IBM

Microsoft