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CSR8635 Bluetooth Stereo Audio Module BT4.1 with On-board Antenna for HFP BTM835
Description:
Adopting CSR8635 chip and 128K EEPROM memory chip, BTM835 Bluetooth audio module supports A2DP, AVRCP, HFP, and AAC. 
Download Specification Information:
http://www.tianjiarun.com/d/file/down/down_1/2016-01-29/ca767f0611b2d60a9f6137675e749ba3.pdf
Download Reference Schematic Diagram:
http://www.tianjiarun.com/d/file/down/down_11/2019-03-05/01352a17a5c07e9a24f7a9052fbda093.pdf
Software Description:
- Bluetooth Name: BT Speaker
Attention: The high level of buttons is effective. MFB high level is 3.3V and PIO high level is 1.8V. The PIO port here is not the actual pin. Please check the specifications to see the real pin.
Button Introduction:
- MFB: High level is used to turn on. Low level is used to turn off. (PIN30 needs low level when the module is powered on. It requires delay circuit when powering on and it will automatically enter into pairing mode.)
- PIO6: Enable pin for power amplifier control. (Output high level 1.8V when audio output is available.)
- PIO8: Short press to play/pause/answer the phone/hang up. Press for 1s to reject the call.
- PIO1: Short press for the previous song. Long press for volume -.
- PIO0: Short press for the next song. Long press for volume +.
Special Functions:
- PIO8: Press for 3s and it will enter into pairing mode. Press for 6s to clear its pairing list.
- PIO8+PIO1: Press for 1s to enter into searching TWS mode (Only for Bluetooth CSRA64xxx/QCC300x series)
- PIO8+PIO0: Press for 1s to enter into searched TWS mode (Only for Bluetooth CSRA64xxx/QCC300x series)
- PIO1+PIO0: Press for 1s to disconnect TWS (Only for Bluetooth CSRA64xxx/QCC300x series)
Package Included:
- 1 x CSR8635 Bluetooth Module
Note:
- Dense module pins require certain circuit and welding knowledge. The module has been tested before shipment.
- Adapter board can be purchased separately for soldering convenience (standard 2.54 spacing).
- When the CSR Bluetooth module audio output is a differential output, which requires op amp or amp circuit to turn it into a single-ended output (left channel, right channel, audio common terminal).
- Module specification information and reference schematic diagram are provided.
- Please refer to the module specification for the default program operation instructions.
