User Manual

Bluetooth Audio Module
Ehong Technology Co., Ltd
1. Contents
1. Description ......................................................................................................................................................... 4
2. Application ......................................................................................................................................................... 4
3. EH-MB18 Product numbering ........................................................................................................................ 4
4. Electrical Characteristic .................................................................................................................................. 5
4.1. Recommend operation conditions ............................................................................................................ 5
4.2. Absolute Maximum Rating ......................................................................................................................... 5
4.3. Power consumptions .................................................................................................................................. 5
4.4. Input/output Terminal Characteristics ...................................................................................................... 7
4.4.1. Digital Terminals .................................................................................................................................. 7
4.4.2. USB ....................................................................................................................................................... 8
4.4.3. Internal CODEC Analogue to Digital Converter .............................................................................. 8
4.4.4. Internal CODEC Digital to Analogue Converter.............................................................................. 9
5. Pinout and Terminal Description ................................................................................................................ 10
5.1. Pin assignment .......................................................................................................................................... 10
6. Physical Interfaces ......................................................................................................................................... 13
6.1. Power Supply ............................................................................................................................................. 13
6.2. Reset ........................................................................................................................................................... 13
6.3. PIO .............................................................................................................................................................. 14
6.4. AIO .............................................................................................................................................................. 14
6.5. RF interface ............................................................................................................................................... 14
6.6. UART .......................................................................................................................................................... 14
6.7. I2C Master .................................................................................................................................................. 15
6.8. Apple iOS CP reference design .............................................................................................................. 16
6.9. Digital Audio Interfaces ............................................................................................................................ 17
6.9.1. PCM .................................................................................................................................................... 18
6.9.2. Digital Audio Interface (I2S) ............................................................................................................. 19
6.9.3. IEC 60958 Interface (SPDIF) .......................................................................................................... 22
6.10. Microphone input ................................................................................................................................... 23
6.11. Analog Output stage ............................................................................................................................. 24
6.12. USB ......................................................................................................................................................... 24
7. EH-MB18 Reference Design ......................................................................................................................... 26