1.1. Features
 Operation voltage from 2.8 V to 5.2 V
 Bluetooth 4.1 + EDR compliant
 -90 dBm sensitivity for 1 Mbps mode and 5 dBm transmit power
 -107 dBm sensitivity FM receiver
 1-wire or 4-wires SD-card interface
 USB 2.0 host and device
 Integrated 90 dB SNR ADC and stereo DAC
 I2C,SPI and UART interface
 Bluetooth A2DP, AVRCP and HFP profile
 SSOP24, SSOP28, QFN48 , QFN32 package