This is one of the semiconductor types. This part name is CSR8645.
This product has Fully Qualified Single-Chip Bluetooth V4.0 System functions.
Manufacturers of product is CSR.
Image and pinout :
CSR8645 PDF Datasheet
Some of the text files within the PDF file
Features ■ BlueCore® CSR8645™ BGA CSR8645 Stereo ROM Solution with aptX™ 2-mic CVC Audio Enhancement Fully Qualified Single-chip Bluetooth® v4.0 System Production Information CSR8645A04 Issue 6 ■ 80MHz RISC MCU and 80MIPS Kalimba DSP Internal ROM, serial flash memory and EEPROM interfaces Stereo codec with 2 microphone inputs Radio includes integrated balun 5-band fully configurable EQ CSR’s latest CVC technology for narrowband and wideband voice connections including wind noise reduction Wideband speech supported by HFP v1.6 profile and mSBC codec Voice recognition support for answering a call, enables true hands-free use Multipoint HFP connection to 2 phones for voice Multipoint A2DP connection enables a headset (A2DP) connection to 2 A2DP source devices for music playback Secure simple pairing, CSR’s proximity pairing and CSR’s proximity connection Audio interfaces: I²S and PCM Serial interfac [ … ]
Please refer to the file for details.