CSR8645 4.0 audio module, support APTx lossless compression speaker amplifier

The main control chip CSR8645 stereo audio module can make calls. The headset can be connected to 2 mobile
phones at the same time. CSR has better sound quality. BLE 4.0, good wall penetration effect, APT-x high sound
quality transmission.

CSR8645 software version introduction:

1 . Buttons: There are 6 function buttons: POWER-EN, PLAY, VOL +, VOL one, PREV, NEXT
The key functions are introduced as follows:
POWER-EN: When the switch is used to control the switch of the module, through the toggle switch, when the
POWER-EN is connected to the BAT, the module is turned on; when the POWER-EN is disconnected from the BAT,
the module is shut down, usually used when battery power is supplied. When the module is powered on, you only
need to connect the POWER-EN in series with a 10K resistor to BAT to power on the module, which is usually used
when external power is supplied.
PLAY: Play/pause (short press), answer/hang up a call (long press, a little longer), re-pair (long press)
VOL+: Volume up
VOL-: volume reduction
PREV: previous song
NEXT: Next song

2. LED: Pairing status, dual lights flash alternately, after pairing, single light flashes;

3. USB sound card function;

4. 3. 2v low power alarm, 3. 0V automatic shutdown, (realizes AMSl117 power supply);

5. The charging current can be set to within 250MA, the light will go out when it is full, and another light will be on
(personally recommend using a charging module, fast);

6. Always in pairing when there is no connection;

7. Can connect 2 mobile phones at the same time;