Bluetooth Decoding Board
Support bluetooth 4.1 Mode, Support automatically back to even, Support to decode WAV/APE/FLAC/MP3 files losslessly, Support to output stereo, With 3W power amplifier on board, Support USB Audio Function, Support the TF card downloading, Support U disk TF card Playing, Supprot IR remote function.

Parameters characteristics
Power Supply 3.7-5V
SNR 90dB
THD+N -70dB
Crosstalk -86dB
DNR 91dB
Support Profile A2DP/AVCTP/AVDTP/AVRCP/HFP
LOS >15m

Functions and interfaces defination

Interfaces specification
Micro USB Supply Micro USB 5V power supply port
USB Audio Connecting this micro USB port with PC USB port by data wire,it can works as external sound card of PC
U disk Supporting to play MP3/WAV/APE/FLAC files stored in the U disk with FAT16/FAT32 file system format
LED Direction The LED always bright in Bluetooth mode，and Flash in the music mode
TF Card Supporting to play MP3/WAV/APE/FLAC files stored in the TF card with FAT16/FAT32 file system formate
IR Remote Supporting IR remote controler
AD key interface Supporting to connect external AD key according to the parameters defined in the circuit
Bluetooth Codec IC The controler of the decoding board
3.5mm stereo output Standard 3.5mm interface，output stereo，connect to earphone or power amplifier
Right channel 3W The right channel of audio output， driving 3W speaker
Left channel 3W The left channel of audio output， driving 3W speaker
3W*2 Power amplifier Two 3W power amplifiers on board
3.7-5Vsupply These pads are used for modification by external power

Functions of the switchs and IR remote

Key functions
PREV/V- “Short press “for the previous one，”Long press “ for volume down
P/MODE “Short press “for playing or pausing，”Long press“ for mode switch
NEXT/V+ “Short press“for the next one，”Long press“for volume up
MODE TF card、U disk、Bluetooth mode switch
RPT Single/Cycle Switch
EQ EQ Switch


Dimension

Operating specification
1、Mode Control
Bluetooth mode is default, powered on when there is no U disk or TF card installed on board; And music mode is defult, powered on when U disk or TF card is installed on board. Switching mode using adkey or IR remote.
2、Music mode
Playing the audio files stored in the U disk and TF card,when plug into U disk and TF card.
3、Bluetooth mode
When switching mode and playing “The bluetooth device is ready to pair”,it goes into Bluetooth mode and is ready to pair. The device named “XY_BT” Cell phone searched is the decoding board device.Connecting the “XY_BT” device with cell phone, the decoding board plays “The bluetooth device is connected successfuly”, the decoding board has connected with the cell phone successfully, and you can playing music through the bluetooth device. Showing in the below picture .


USB Audio
Connecting the decoding board with PC by USB data wire. Switching mode and playing “USB mode”, it’s in USB Audio mode. Playing music by PC player , and the decoding board will play the music in the PC player list. If pluging into TF card, can download music into the TF card from PC.
NOTE:
1、When working in the USB Audio mode, U disk mustn’t be pluged into board.
2、In the U disk playing mode, suggesting that use 5V power to supply(don’t use 3.7V power to supply), because earlier U disk can’t support 3.7V power supply.
3、When using mobile power and PC USB port to supply, must use Power port on the board(mustn’t use USB Audio port on board), or can’t playing audio files stored in U disk.
4、This decoding board only support FAT16/FAT32 file system format, both U disk and TF card, don’t support NTFS file system format.