一．产品概述
SMH-BT8635 V1.0蓝牙模块为本公司自主开发的智能型无线音频数据传输产品，是低成本
的高效率的立体声无线传输方案，模块采用了CSR BC8芯片为模块提供了高品质的音质和兼容
性，整体性能更优化。模块采用免驱动方式，客户只需要把模块接入应用产品，就可以快捷地实
现音乐的无线传输，享受无线音乐的乐趣。
二．应用领域
该模块主要用于短距离的音乐传输，可以方便地和笔记本电脑，手机，PDA等数码产品的蓝
牙设备相连，实现音乐的无线传输。
◆ 蓝牙音响
◆ 蓝牙立体声耳机
◆ 免提电话
◆ 蓝牙无线传输音频
◆ 蓝牙拔号器
三．基本特性
Bluetooth Profiles
◆ Bluetooth v4.0 specification support
◆ HFP v1.6
◆ HSP v1.2
◆ A2DP v1.2
◆ AVRCP v1.4
◆ Support for smartphone applications (apps)
Music Enhancements
◆ Configurable 5-band EQ for music playback (rock,pop, classical, jazz, dance etc)
◆ SBC, MP3, AAC and Faststream decoder
◆ Stereo widening (S3D)
◆ Volume Boost
◆ Support for voice recognition
◆ Support for multi-language programmable audio prompts
◆ CSR's proximity pairing and CSR's proximity connection
◆Multipoint support for HFP connection to 2 handsets for voice
◆ Multipoint support for A2DP connection to 2 A2DP sources for music playback
◆ Talk-time extension
Improved Audio Quality
CSR’s latest 2-mic CVC audio enhancements for narrowband and wideband connections including::
◆1-mic far-end audio enhancements
◆Near-end audio enhancements )noise suppressionand AEQ)
◆Wind noise reduction
◆Packet loss concealment
◆Bit error concealment
◆Automatic gain control and automatic volumecontrol
◆Frequency expansion for improved speech intelligibility
◆mSBC codec support for wideband speech
四．性能参数
型号SMH-BT8635 V1.0
蓝牙规格Bluetooth V4.0
调制方式Π/4 DQPSK,8DPSK
供电电压3.3-4.2V
支持蓝牙协议HFPV 1.6,HSPV 1.2,A2DP V1.2,AVRCP V1.4
工作电流＜20mA
待机电流＜50uA
温度范围-40℃至+80℃
无线传输范围≥10M
传输功率支持CLASS1/CLASS2/CLASS3最大可调8dBm
灵敏度： -80dBm<0.1%BER
频
频率范围： 2.4GHz-2.480GHz
对外接口： PIO, SPI, I2C and PCM,USB
音频性能 立体声支持AAC, MP3, SBC
音频信噪比： ≥75dB
失真度≤0.1%
模块尺寸22*14*1.8
五．模块封装尺寸
六．模块PIN脚定义
七．模块PIN脚功能说明
Pin Symb I/O Description
1 PIO21 Bi-directional with strong
pull-down
Programmable input /output
2 PIO18 Bi-directional with strong
pull-down
Programmable input /output
3 PIO17 Bi-directional with strong
pull-down
Programmable input /output
4 PIO9 Bi-directional with strong
pull-down
Programmable input /output
5 PIO7 Bi-directional with strong
pull-down
Programmable input /output
6 PIO6 Bi-directional with strong
pull-down
Programmable input /output
7 PCM Input with weak SPI/PCM select input
8 CS Bi-directional with strong
pull-down
Programmable input/put
Alternative function:SPI data
Output PCMIsynchronous data sync
9 MISO Bi-directional with strong
pull-down
Programmable input/put
Alternative function:SPI data
Output PCMIsynchronous data
Output
10 MOSI Bi-directional with strong
pull-down
Programmable input/put
Alternative function:SPI data
Input PCMIsynchronous data
Output
11 CLK Bi-directional with strong
pull-down
Programmable input/put
Alternative function:SPI clock
PCMIsynchronous data clock
12 RST Reset if low,pull low minimum 5ms
to case a reset
13 VBAT Battery positive terminal 3.3-4.2V
14 GND Ground Ground connect battery negative
15 VCHG Charger input
16 CHG_EXT External Battery charger Charge
17 VBAT_SENESE Battery charger sense
input
BAT_SENSE
18 TX Bi-directional with strong
pull-down
Programmable input/output
Alternative function:UART data
output
19 RX Bi-directional with strong
pull-down
Programmable input/output
Alternative function:UART data
input
20 USB_N Bi-directional USB data plus with selectable
internal 1.5k pull up resistor
21 USB_P Bi-directional USB data minus
22 POWER_EN Input with weak pull-down Regulator enable input
23 1V8 POWER +1.8V Output
24 LED0 Bi-directional LED Driver
25 LED1 Bi-directional LED Driver
26 LED2 Bi-directional LED Driver
27 LINE/MIC_AN Analogue in LINE or Microphone input
positive ,channel A
28 LINE/MIC_AP Analogue in LINE or Microphone input
negative ,channel A
29 MIC_BIAS Analogue out Microphone bias
30 LINE_BN Analogue in LINE input negative ,channel A
31 LINE_BP Analogue in LINE input negative ,channel A
32 SPK_RN Analogue out Speaker output negative,right
33 SPK_RP Analogue out Speaker output positive,right
34 SPK_LN Analogue out Speaker output negative,right
35 SPK_LP Analogue out Speaker output positive,right
36 GND2 Ground Ground connect battery negative
37 RF Radio-frequency signal RF signal output
38 GND1 Ground Ground connect battery negative
八．设计注意事项：（模块兼容8615、8630、8635三个IC，就是分单、双声道）
1.BC8615-----------是单声道芯片
这时音频只有PIN34 ,PIN35也就是SPK_LN,SPK_LP 有音频输出，而SPK_RN,SPK_RP是空脚
BC8630,8635-------是双声道的芯片，SPK_LN,SPK_LP,SPK_RN,SPK_RP都有音频输出，属于立
体声，BC8630不带MIC，带双LINE输入
2.IO口注意事项
PIO21,PIO18,PIO17,PIO9,PIO7,PIO6有这6 个IO口可以用来做按键，其它口做输出
九．电路连接注意
SMH-BT8635 V1.0外接功放的时候，必须接差分输入的功放，如果不接差分输入的功放，
必须接一个运放平衡两个差分的电平，否则会有：“啪啪”的冲击声
十．注意事项
A．如果模组天线旁边有电池，金属物，液晶屏，喇叭等，要求离天线距离至少15MM
B．layout时供电线路建议使用星形走线，并确保蓝牙模组供电线性度要好，还有BT的地必
须与运放，功放，MCU等的地分开，而且BT下侧不可有其它干扰地。
C．天线周围不可走控制线，电源线，音频线，MIC等干扰线。
D. 如果模组天线附近有排座，外壳有金属铁网等对信号有影响的，建议避开，可选用专业
的高增益天线
十一．应用电路
蓝牙模组应用原理
十二．印制PCB天线选用
1、蛇形天线
2、倒F天线

十三．推荐回流温度