EM6Q321B(BTM321)Bluetooth 5.0 Stereo Audio Module TWS CVC I2S DAC

BTM321 bluetooth module，with QCC3021 chip ，built in 32M FLASH。

Warm Reminder：

1. Bluetooth datasheet and schematic diagram. can be offered.

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

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I2S firmware description

1. Bluetooth name：QCC3021-I2S

2. USB devcie name：QCC3021

              Support USB and Bluetooth mode, Bluetooth priority (Bluetooth no audio playback automatically switch to USB mode)

              Call function not supported

              USB sound card parameters: 16bit / 44.1k/48k

3. Button description：

                      PIO2：Short press play /pause, long press 3 seconds to enter pairing, long press 5 seconds to clear pairing record

            PIO3：short press Last，Long press Volume-

            PIO4：Short press Next，Long press Volume+

            PIO5：Connect high level, not low level

            PIO19 ：Audio output high level, no audio low level

4.   Description of encoding and decoding indicator：

                         Bluetooth not connected: LED0 LED1 flashes alternately

                         Bluetooth connected: LED1 always on

                         Bluetooth audio playback: LED1 always on

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SPDIF  firmware description

1. Bluetooth name：QCC3021-SPDIF

2. USB device：QCC3021

Support USB and Bluetooth mode, Bluetooth priority (Bluetooth no audio playback automatically switch to USB mode)

Call function not supported

USB sound card parameters: 16bit / 44.1k/48k

3. Button description：：

PIO2：Short press play /pause, long press 3 seconds to enter pairing, long press 5 seconds to clear pairing record

PIO3：short press Last，Long press Volume-

PIO4：Short press Next，Long press Volume+

PIO5：Connect high level, not low level

PIO19 ：Audio output high level, no audio low level

PIO20 ：SPDIF output

4. Description of encoding and decoding indicator：

Bluetooth not connected: LED0 LED1 flashes alternately

Bluetooth connected: LED1 always on

Bluetooth audio playback: LED1 always on

DAC simulation firmware description

1. Bluetooth name：QCC3021-DAC

2. USB device：QCC3021

Support USB and Bluetooth mode, Bluetooth priority (Bluetooth no audio playback automatically switch to USB mode)

Call function not supported

USB sound card parameters: 16bit / 44.1k/48k

3. Button description：

PIO2：Short press play /pause, long press 3 seconds to enter pairing, long press 5 seconds to clear pairing record

PIO3：short press Last，Long press Volume-

PIO4：Short press Next，Long press Volume+

PIO5：Connect high level, not low level

PIO19 ：Audio output high level, no audio low level

4. Description of encoding and decoding indicator：

Bluetooth not connected: LED0 LED1 flashes alternately

Bluetooth connected: LED1 always on

Bluetooth audio playback: LED1 always on

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Module manual download:        

Developing burning tools1:     Trbi200 Bluetooth burner development tool    

Developing burning tools2:     Qualcomm original DK-TRBI200-CE684-1-ND Bluetooth development tool  

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