This part is a kind of semiconductor called STMP3505.

Function of this product has D-Major Audio System on Chip.

Manufacturers : SigmaTel

Image and pinout :

Some of the text within the PDF file :

Integrated Mixed-Signal Solutions PRODUCT DATA SHEET STMP35xx D-Major™Audio System on Chip with USB 2.0, LCD, Voice Record and Battery Charger Third Generation Audio Decoder Version 1.07 November 9, 2004 90 94 FM Tuner 98 102 106 Host Processor (Optional) Rechargeable Battery Hi-Speed USB LED/LCD Screen SDRAM Microphone Voice Record Flash Memory Hard Drive Buttons/Switches CD Pickup Headphones OFFICIAL PRODUCT DOCUMENTATION 12/1/04 5-35xx-D1-1.07-110904 Copyright © 2004 SigmaTel, Inc. All rights reserved. SigmaTel, Inc. makes no warranty for the use of its products, assumes no responsibility for any errors which may appear in this document, and makes no commitment to update the information contained herein. SigmaTel reserves the right to change or discontinue this product [ ... ]

STMP3505 PDF Datasheet Download