PixArt Imaging Inc.

PAW3401

12 PIN PS/2 Optical Mouse Sensor

2. Block Diagram and Operation

Figure 3. Block diagram

The PAW3401 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

PAW3401 includes PS/2 interface so that no mouse controller is needed to interface through PS/2. The

PAW3401 can receive command and echo status or data format which are compatible with IBM PS/2 mouse and

Microsoft 3D PS/2 mouse.

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PixArt Imaging Inc.

V1.1, Dec. 2006

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