Specifications

M95 Hardware Design
M95_HD_V1.0 - 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 caution ................................................................................................................... 12
2. Product concept ........................................................................................................................... 14
2.1. Key features ..................................................................................................................... 14
2.2. Functional diagram .......................................................................................................... 16
2.3. Evaluation board .............................................................................................................. 18
3. Application interface ................................................................................................................... 19
3.1. Pin .................................................................................................................................... 20
3.1.1. Pin assignment ...................................................................................................... 20
3.1.2. Pin description ....................................................................................................... 21
3.2. Operating modes .............................................................................................................. 26
3.3. Power supply .................................................................................................................... 27
3.3.1. Feature of GSM power .......................................................................................... 27
3.3.2. Minimize supply voltage drop............................................................................... 27
3.3.3. Reference power design for the module ................................................................ 28
3.3.4. Monitor power supply ........................................................................................... 29
3.4. Power on and down scenarios .......................................................................................... 29
3.4.1. Power on ............................................................................................................... 29
3.4.2. Power down ........................................................................................................... 31
3.4.3. Restart ................................................................................................................... 35
3.5. Power saving .................................................................................................................... 36
3.5.1. Minimum functionality mode................................................................................ 36
3.5.2. Sleep mode ............................................................................................................ 36
3.5.3. Wake up the module from SLEEP mode .............................................................. 37
3.6. Summary of state transitions ............................................................................................ 37
3.7. RTC backup ..................................................................................................................... 37
3.8. Serial interfaces ................................................................................................................ 39
3.8.1. UART Port ............................................................................................................ 40
3.8.2. Debug Port ............................................................................................................ 44
3.8.3. UART Application ................................................................................................ 44
3.9. Audio interfaces ............................................................................................................... 48
3.9.1. Decrease TDD noise and other noise .................................................................... 49
3.9.2. Microphone interfaces design ............................................................................... 50
3.9.3. Receiver interface design ...................................................................................... 50
3.9.4. Earphone interface design ..................................................................................... 51
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