PixArt Imaging Inc.

PAN301A

CMOS Optical Mouse Sensor

2. Block Diagram and Operation

CMOS

IMAGE

SENSOR

DIGITAL

SIGNAL

PROCESSOR

POWER ON

RESET

SERIAL

INTERFACE

LED

DRIVE

CONTROL REGISTER

SCLK

SDIO

OSCILLATOR

YA

YB

XA

XB

LED

VREFA

VREFB

PD

VDD

VSS

OSCIN

OSCOUT

SERIAL

INTERFACE

QUADRATURE

OUTPUTS

RESONATOR

VOLTAGE

REFERENCE

5V

POWER

VSS_LED

VSS

Figure 3. Block diagram

The PAN301A is a high performance CMOS-process optical mouse sensor with DSP integration chip 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 20pin optical package. The output format is two-channel quadrature (X and Y direction),

which emulates encoder phototransistors. The current X and Y information are also available in registers

accessed via a serial port.

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PixArt Imaging Inc.

V1.3, MAY. 2004