ED8635
Introduction
ED8635-B Bluetooth stereo audio modules British CSR's main chip design. High integration, small size, superior sound quality and other characteristics, external components can be achieved only with a few of its powerful features. With a A2DP, AVRCP any Bluetooth audio devices and remote transmission control protocol (such as: Bluetooth-enabled mobile phones, Bluetooth stereo audio transmitter module, Bluetooth adapters, etc.) to establish a connection, receive high-quality wireless stereo audio stream, and enables remote control of the audio player.
Size and pin definitions ED8635-B compatible ED05-B, the user can upgrade the product without any changes under the premise, reducing product development time.
Features
- Built-in high-quality DAC converter circuit: 95dB SNR
- Powerful built-in features of Kalimba DSP data processor, complete a variety of digital speech processing
- Very small module size: 15x21mm, compatible with all product structure
- Higher Bluetooth version: Bluetooth V4.0, high software compatibility
- Very low power consumption: less than 2mA operating current
- A far transmission distance: Class2 RF power levels of up to 20 m above
- With high-quality audio transmission protocol: A2DP1.2, AVRCP1.4 remote control protocol
- Call agreement with HFP V1.6
- Simple Pairing Support
- Support AUX input
- RoHS compliant modules
Pin Definitions
| Pin NO. | Pin Definition | I/Os Default | Description |
|---|---|---|---|
| 1 | GND | GND | |
| 2 | PIO15 | Next Song control/PIO15/uart_tx | |
| 3 | PIO14 | External amplifier mute control / mute / PIO14 / uart_rx | |
| 4 | RST | IN | external RST (Low) |
| 5 | MOSI | MOSI/PIO2/PCM1_IN | |
| 6 | CLK | CLK/PIO5/PCM1_CLK | |
| 7 | CSB | CSB/PIO4/PCM1_SYNC | |
| 8 | MISO | MISO/PIO3/PCM1_OUT | |
| 9 | Red LED | OUT | LED 1 |
| 10 | Blue LED | OUT | LED 2 |
| 11 | VREG | IN | Power on/off / pair / listen to the phone call control |
| 12 | 1V8 | OUT | 1.8V output |
| 13 | VBAT | IN | power or lithium battery power input |
| 14 | Vsense | IN | lithium battery detection |
| 15 | GND | GND | |
| 16 | MIC_BIAS | OUT | microphone power |
| 17 | AUX_RP | IN | line input right channel positive |
| 18 | AUX_LN | IN | line input left channel nagetive |
| 19 | MIC_LP | IN | microphone input positive / AUX_LP |
| 20 | MIC_LN | IN | line input input positive / AUX_LN |
| 21 | GND | GND | |
| 22 | SPK_RN | OUT | stereo right channel output negative |
| 23 | SPK_RP | OUT | stereo right channel output positive |
| 24 | SPK_LN | OUT | stereo left channel output negative |
| 25 | SPK_RP | OUT | stereo left channel output positive |
| 26 | PIO21 | play pause control / PIO21 | |
| 27 | PIO18 | play volume down control / PIO18 | |
| 28 | PIO7 | play volume up control / PIO7 | |
| 29 | PIO6 | previews song / PIO6 | |
| 30 | GND | GND | |
| 31 | ANT | external antenna |
scheamtic and circuit design
Line and MIC input
schematic of demo board
