EM6C835A(BTM835) CSR8635 bluetooth module with PCB Antenna

EM6C835B bluetooth module，with CSR8635 chip ，support A2DP，AVRCP，HFP，AAC，with 128K EEPROM memory chip

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:

Bluetooth name： BT Speaker

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

MFB : power on at high level and shutdown at low level (pin30 needs low level when the module is powered on, and a 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)

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

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

PIO1：   short press last/volume-

PIO0： short press next/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

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