User's Manual

M50Hardware Design
M50_HD_V2.0 - 3 -
Contents
Contents ................................................................................................................................................... 3
Table Index .............................................................................................................................................. 5
Figure Index ............................................................................................................................................ 6
0. Revision history .................................................................................................................................. 8
1. Introduction ....................................................................................................................................... 9
1.1. Related documents.................................................................................................................... 9
1.2. Terms and abbreviations......................................................................................................... 10
1.3. Safety cautions ........................................................................................................................ 12
2. Product concept ............................................................................................................................. 15
2.1. Key features ............................................................................................................................ 15
2.2. Functional diagram ................................................................................................................. 17
2.3. Evaluation board ..................................................................................................................... 18
3. Application interface ...................................................................................................................... 19
3.1. Pin of module .......................................................................................................................... 20
3.1.1. Pin assignment .............................................................................................................. 20
3.1.2. Pin description .............................................................................................................. 22
3.2. Operating modes ..................................................................................................................... 29
3.3. Power supply........................................................................................................................... 30
3.3.1. Power features of module ............................................................................................ 30
3.3.2. Decrease supply voltage drop ...................................................................................... 30
3.3.3. Reference design for power supply ............................................................................. 31
3.3.4. Monitor power supply .................................................................................................. 32
3.4. Power on and down scenarios ................................................................................................ 32
3.4.1. Power on ....................................................................................................................... 32
3.4.2. Power down .................................................................................................................. 34
3.4.3. Restart ........................................................................................................................... 36
3.5. Charge interface ...................................................................................................................... 38
3.6. Power saving ........................................................................................................................... 38
3.6.1. Minimum functionality mode ...................................................................................... 38
3.6.2. SLEEP mode................................................................................................................. 39
3.6.3. Wake up module from SLEEP mode .......................................................................... 39
3
.7. Summary of state transition ................................................................................................... 39
3.8. RTC backup............................................................................................................................. 40
3.9. Serial interfaces ...................................................................................................................... 41
3.9.1. UART Port .................................................................................................................... 42
3.9.2. Debug Port .................................................................................................................... 46
3.9.3. Auxiliary UART Port ................................................................................................... 46
3.9.4. UART application ........................................................................................................ 47
3.10. Audio interfaces .................................................................................................................... 50
3.10.1. Decrease TDD noise and other noise ........................................................................ 51
3.10.2. Microphone interfaces design.................................................................................... 51
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