This part is a kind of semiconductor called FT5316.

Function of this product has True Multi-Touch Capacitive Touch Panel Controller.

Manufacturers : FocalTech Systems

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Some of the text within the PDF file :

FT5x16 True Multi-Touch Capacitive Touch Panel Controller INTRODUCTION The FT5x16 Series ICs are single-chip capacitive touch panel controller ICs with a built-in Micro-controller unit (MCU).They adopt the mutual capacitance approach, which supports true multi-touch capability. In conjunction with a mutual capacitive touch panel, the FT5x16 have user-friendly input functions, which can be applied on many portable devices, such as cellular phones, MIDs and GPS. The FT5x16 series ICs include FT5216/FT5316, the difference of their specifications will be listed individually in this datasheet. FEATURES  Mutual Capacitive Sensing Techniques  True Multi-touch with up to 5 Points of Absolution X and Y Coordinates  Immune to RF Interferences  Auto-calibration: Insensitive to Capacitan [ ... ]

FT5316 PDF Datasheet Download