This part is a kind of semiconductor called A2624.

Function of this product has (A2624 / A2625) Turbo 3D USB + PS2 Optical Moude Controller.

Manufacturers : Apexone

Image and pinout :

Some of the text within the PDF file :

A2624/A2625 Turbo 3D USB+PS/2 optical mouse controller 1. General Description A2624/A2625 is a 3D 5key crystal-free optical mouse controller designed for USB and PS/2 applications. It minimizes external components to ensure competitive low cost BOM. A2624/A2625 supports the USB Standard v1.1 as well as HID Class Definition v1.1. It is compatible with Microsoft 3D Intellimouse and IBM PS/2 mouse. It also supports mechanical scroll, opto-mechanical scroll. 2. Features z Crystal-free design with internal oscillator directly feeding clock to sensor implements totally crystal-free system design z Spread spectrum function to reduce EMI z SPI interface to control the sensor IC with minimal wire line connection z Microsoft 3D Intellimouse and IBM PS/2 mouse compatible z Com [ ... ]

A2624 PDF Datasheet Download