User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 0. Revision history
- 1. Introduction
- 2. Product concept
- 3. Application interface
- 3.1. Pin of module
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charge interface
- 3.6. Power saving
- 3.7. Summary of state transition
- 3.8. RTC backup
- 3.9. Serial interfaces
- 3.10. Audio interfaces
- 3.11. SIM card interface
- 3.12. SD card interface
- 3.13. PCM interface
- 3.14. ADC
- 3.15. Behaviors of the RI
- 3.16. Network status indication
- 3.17. Operating status indication
- 4. Antenna interface
- 5. Electrical, reliability and radio characteristics
- 6. Mechanical dimensions
- 7. Storage and manufacturing
- Appendix A: GPRS coding schemes
- Appendix B: GPRS multi-slot classes
M50 Hardware Design
M50_HD_V2.0 - 55 -
3.10.6. Audio characteristics
Table 14: Typical electret microphone characteristics
Parameter Min Typ Max Unit
Working Voltage 1.2 1.5 2.0 V
Working Current 200 500 uA
External Microphone Load Resistance 2.2 kOhm
Table 15: Typical speaker characteristics
Parameter Min Typ Max Unit
Normal
Output
(AOUT1)
Single
Ended
Load
Resistance
28 32 Ohm
Ref level 0 2.4 Vpp
Differential Load
Resistance
28 32 Ohm
Ref level 0 4.8 Vpp
Auxiliary
Output
(AOUT2)
Single
Ended
Load
Resistance
16
32 Load
Resistance
Ref level 0 2.4 Vpp
Output
(AOUT3)
Differential
Load
Resistance
8 Load
Resistance
Ref level 0 2×V BAT Vpp
3.11. SIM card interface
3.11.1. SIM card application
The SIM interface supports the functionality of the GSM Phase 1 specification and also supports
the functionality of the new GSM Phase 2+ specification for FAST 64 kbps SIM card, which is
intended for use with a SIM application Tool-kit.
The SIM interface is powered from an internal regulator in the module. Both 1.8V and 3.0V SIM
Cards are supported.
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