EM6Q308B(BTM308-C) QCC3008 Bluetooth 5.0 Stereo APTX Audio ...

EM6Q308A bluetooth audio modue，with QCC3008 chip ，support A2DP，AVRCP，HFP，TWS，AAC，I2S，APTX，APTX-LL，with 16M SPI FLASH Memory chip。

2019/6/4 firmware update supports both I2S digital and differential analog audio output, and cancels various prompt tones that most customers dislike.

Warm Reminder：

1. The datasheet and schematic diagram can be offered.

2. The audio of CSR Bluetooth module is differential output, so it is necessary to add op amp or oto amplifier circuit to single end output (left channel, right channel, audio common terminal).

3. The actual pin corresponding to the PIO port needs to check the datasheet by yourself!

Default program description:

1.bluetooth name：BT Speaker

2.Power on mode:

Key high level is valid (MFB high level is 3.3V, PIO high level is 1.8V)!

MFB is started at high level and shut down at low level (pin30 needs low level when power on, and delay circuit is required for power on and power on. It can not be pulled up directly, and it will automatically enter the pairing mode when the module is powered on)

3. Key Description:：

PIO6：Power amplifier control enable pin (output high level 1.8V with audio output)

PIO8：short press play / pause / answer / end, long press for 1 second to reject the call

PIO1： short press Last，Long press Volume-

PIO7： Short press Next，Long press Volume+

Special function description:

PIO8：Press and hold for 3 seconds to force the pairing mode, and press for 6 seconds to clear the pairing list

PIO8 PIO1：Press and hold for 1 second to enter the search TWS mode

PIO8 PIO0：Press and hold for 1 second to enter the searched TWS mode

PIO1 PIO0：Press and hold for 1 second to disconnect TWS

Module manual download:

Developing burning tools: CSR-USB-SPI programming simulation burner full function version

Qualcomm bluetooth audio module selection table：

Part Number	Chip type	BT Ver	Stereo	aptX	aptX-HD	ANC	TWS	TWM	CVC	I2S	SPDIF	ANT	Manual	Buy
EM6C835A	CSR8635	4.1	√	X	X	X	X	X	X	X	X	√
EM6C835B	CSR8635	4.1	√	X	X	X	X	X	X	X	X	X
EM6C625A	CSRA64215	4.2	√	√	X	X	√	X	X	√	X	√
EM6C625B	CSRA64215	4.2	√	√	X	X	√	X	X	√	X	X
EM6C870B	CSR8670	5.0	√	√	X	X	√	X	*	√	√	X
EM6C875B	CSR8675	5.0	√	√	*	X	√	X	*	√	√	X
EM6Q303A	QCC3003	5.0	√	X	X	X	X	X	√	√	X	√
EM6Q308A	QCC3008	5.0	√	√	X	X	√	X	√	√	X	√
EM6Q308B	QCC3008	5.0	√	√	X	X	√	X	√	√	X	X
EM6Q320B	QCC3020	5.0	X	X	X	X	√	X	√	√	X	X
EM6Q321B	QCC3021	5.0	√	X	X	X	√	X	√	√	√	X
EM6Q334B	QCC3034	5.0	√	√	√	X	X	X	√	√	X	X
EM6Q340B	QCC3040	5.0	X	√	√	√	X	√	√	√	X	X
EM6Q525B	QCC5125	5.0	√	*	*	*	√	X	*	√	√	X
EM6Q526B	QCC5126	5.0	√	*	*	*	√	X	*	√	√	X
EM6Q544B	QCC5144	5.0	√	*	*	*	X	√	*	√	√	X
Data Direction
Chip type			The main control chip model of the module
BT Ver			Bluetooth version
Stereo			"√" support Bluetooth Stereo "X" Support Bluetooth mono
aptX			Improve sound quality, reduce delay, support 16bit / 48K audio (Note: SBC is 16bit / 44.1k)
aptX-HD			Improve sound quality, reduce delay, support 24bit / 48K audio
ANC			Active noise reduction, specific effects need to be coordinated with reasonable structure adjustment, default firmware does not open this function, can be customized development
TWS			True wireless stereo ,phone can connect two wireless earphone at the same，This function is not enabled by default firmware and can be customized
TWM			True wireless mirroring TWS upgrated version，More intelligent master-slave switch, default firmware does not enable this function, can be customized development
CVC			Call echo cancellation algorithm, the specific effect needs to cooperate with reasonable structure adjustment, default firmware does not enable this function, can be customized development.
I2S			I2S Digital audio output
SPDIF			SPDIF Digital audio output
ANT			PCB antenna
Mark			"*"it means that need license