This part is a kind of semiconductor called A2601DC-C.

Function of this product has 3D USB+PS2 Mouse.

Manufacturers : Apexone

Image and pinout :

Some of the text within the PDF file :

A2601DC-C 3D USB+PS2 Mouse Features ¡¤ ¡¤ ¡¤ ¡¤ ¡¤ ¡¤ Complete Universal Serial Bus specs V1.1 compatibility USB transceiver and controller integrated PS/2 mouse compatible ¡¤ ¡¤ ¡¤ ¡¤ ¡¤ Three buttons (R, M, L) and three axes (X, Y, Z) input Single chip solution for USB mouse function PAN101BSI-204/208¡¢ Agilent HDNS2000 or ADNS2051 ¡¢ OM01/OM02 to makeup optical mouse Support 800dpi with PAN101BOI-208 or PAN101BSI-208 Plug and Play functions 6MHz crystal or ceramic oscillator for system clock 18-pin DIP package Reduced external components Fully support of Win2000, XP, ME (with driver), 98 (with driver),DOS(with driver) ¡¤ Working with PixArt PAN101BOI-204/208 ¡¢ Description A2601DC-C is a 3D mouse controller especially designed for USB and PS/2 applicatio [ ... ]

A2601DC-C PDF Datasheet Download