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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.
All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission
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PixArt Imaging Inc.
E-mail: fae_service@pixart.com.tw
V1.3, MAY. 2004
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