Specifications

M80 Hardware Design
M80_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 ......................................................................................................... 22
3.2. Operating modes ............................................................................................................... 31
3.3. Power supply ..................................................................................................................... 32
3.3.1. Feature of GSM power ............................................................................................ 32
3.3.2. Minimize supply voltage drop ................................................................................. 32
3.3.3. Reference power design for module ........................................................................ 33
3.3.4. Monitor power supply ............................................................................................. 34
3.4. Power on and power down scenarios ................................................................................ 34
3.4.1. Power on .................................................................................................................. 34
3.4.2. Power down ............................................................................................................. 36
3.4.3. Restart ...................................................................................................................... 40
3.5. Charging interface ............................................................................................................. 41
3.6. Power saving ..................................................................................................................... 41
3.6.1. Minimum functionality mode .................................................................................. 41
3.6.2. SLEEP mode ........................................................................................................... 41
3.6.3. Wake up module from SLEEP mode ...................................................................... 42
3.7. Summary of state transitions ............................................................................................. 42
3.8. RTC backup ....................................................................................................................... 42
3.9. Serial interfaces ................................................................................................................. 44
3.9.1. UART Port .............................................................................................................. 45
3.9.2. Debug Port ............................................................................................................... 49
3.9.3. Auxiliary UART Port .............................................................................................. 49
3.9.4. UART Application .................................................................................................. 50
3.10. Audio interfaces .............................................................................................................. 53
3.10.1. Decrease TDD noise and other noise .................................................................... 54
3.10.2. Microphone interfaces design ................................................................................ 55
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