PixArt Imaging Inc.

PAW3402 / PAW3412

PS/2 Optical Mouse SOC

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PixArt Imaging Inc.

V1.0, Feb. 2008

7. Mouse Mode Selection

The Set Sampling Rate command is used to set the device operating modes. Whenever the mouse received

command 'FF', it will reset to standard mode (2D3B) mode. After power-on reset is initiated, the mouse is set to

standard PS/2 mode.

The Device ID is available through the PS/2 Read Device Type (0xF2) command. For a device in standard 2D

mode, the device will report an ID of 0x00. For a device in standard 3D mode, the device will report an ID of

0x03.

Mode

Device ID

Standard 2D mode (2D3B)

0x00

Standard 3D mode (3D3B)

0x03

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Standard 3D Mouse (3D3B) Command Sequence

After Reset, the device will be in standard 2D mode. By sending the Set Sampling Rate command series as

follows, the device is set to standard 3D mode.

Command

Response

F3

FA

C8

FA

F3

FA

64

FA

F3

FA

50

FA

F2

FA, 03

Notice that the Set Sampling Rate commands are valid, and the device report rate will be the value of the last

command; that is, 0x50 after this series of commands.