This is one of the semiconductor types. This part name is GPD2856A.
This product has MP3 player with FM radio function and Line In function and design of the chip functions.
Manufacturers of product is Generalplus.
Image and pinout :
GPD2856A PDF Datasheet
Some of the text files within the PDF file
The GPD2856A is a chip designed for MP3 players with FM radio and LineIn features.
1. Support MP3 playback format.
2. Can play T card / SD card, U disk, FM, and external audio (LineIn), plug the first broadcast, but also by the Mode key to switch.
3. Automatically detect whether the headset is inserted, and thus by the IO port (Mute) directly switch the external amplifier, no external transistor.
4. Support the volume size, the number of songs, … stored in the T card / SD card, U disk, the user can save EEPROM
5. Can automatically detect whether the external EEPROM is determined in the EEPROM or T card / SD card, U disk, save the settings.
6. With an AD-key port to achieve a variety of key combinations.
7. There are two sets of AD-key keyboards to choose from.
8. Support 3 FM radio chips: RDA5807, BK1080 and RTC6207E.
9. Do not support infrared remote control.
10. USB device mode is not supported.
11. Support USB audio mode.
12. Package Type: SOP16 package.
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Please refer to the file for details.