Function Description
Conform with Bluetooth 2.1 specification
Support A2DP V1.2, AVRCP V1.4 Profiles
Integrate EEPROM, can configure operating mode and parameters
3D audio output can drive 40mW@32ohm speaker without the need of AC coupling capacitor
Integrate power on reset and programmable LVD function
6 input button, including on/off, pairing, volume +, volume -, previous, next
2 indicator indicate different operating mode.
Technical Parameters
Pin Assignment
|
Pin |
Name |
Type |
Description |
|
1 |
XO |
XTAL |
12MHZ Crystal Oscillator |
|
2 |
AOM |
Audio |
Audio Output Common Pin |
|
3 |
AOL |
Audio |
Left Channel Audio Output |
|
4 |
AOR |
Audio |
Right Channel Audio Output |
|
5 |
MIC+ |
Mic |
MIC+ Control |
|
6 |
MICBIAS |
Mic |
MICBIAS Control |
|
7 |
LED1 |
Sink |
LED 1 Control |
|
8 |
LED2 |
Sink |
LED 2 Control |
|
9 |
VCC |
Power |
4.5-5.5V Input Voltage |
|
10 |
VBUCK |
Power |
3.3V LDO Input |
|
11 |
GND |
Power |
Ground |
|
12 |
VBAT |
Power |
Power Input |
|
13 |
1V8 |
Power |
LDO Output 1.8V |
|
14 |
ONKEY |
Digital |
ON/OFF Key Signal |
|
15 |
VOL+ |
Digital |
Volume+ Key |
|
16 |
VOL- |
Digital |
Volume- Key |
|
17 |
RESET |
Digital |
Reset |
|
18 |
NC |
NC |
NC |
|
19 |
MFB1 |
Digital |
Pairing Key |
|
20 |
UART-TX |
Digital |
UART Transmitting Signal |
|
21 |
UART-RX |
Digital |
UART Receiving Signal |
|
22 |
PREV |
Digital |
Previous |
|
23 |
NEXT |
Digital |
Next |
|
24 |
PLAY/PAUSE |
Digital |
Play/Pause |
|
25 |
VPP |
Power |
Programming Voltage |
|
26 |
GND1 |
Power |
Ground |
|
27 |
GND2 |
Power |
Ground |
Known Problem List
1. The media players on some phones do not have the fade out/in feature. There will be pop sound when play/pause.
2. Because bluetooth open circuit detection is an off-line task, there will be delay when disconnect the smart phone with the speaker.
3. The auto-reconnecting function is incompatible with the auto-shutting off function. When the auto-reconnecting function is turned on, the auto-shutting off function will not work properly.
4. When there are connected devices and the auto-reconnecting function is turned on, the reconnecting function may conflict with the pairing function and may occasionally
cause pairing to fail.
5. There will be a transient moment where the output is floating at the power on instance. The speaker
will produce a sound.
Size
Circuit and Application
Warning: The input voltage to the bluetooth module should not be too high, or the module will be burned. If the module
uses the same power source as the amplifier, a step-down circuit is required.
Application directions:
The input voltage to the module should be 3.0V-4.2V(Warning if below 3.3V), ANT is connected to internal antenna. Open the bluetooth device on cell phone, scanning
for the device name of bluetooth speaker module. The pairing key is 0000. Open the media player on cell phone
to play music.
