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
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Power saving
- 3.6. Summary of state transitions
- 3.7. RTC backup
- 3.8. Serial interfaces
- 3.9. Audio interfaces
- 3.10. SIM card interface
- 3.12. Behaviors of the RI
- 3.13. Network status indication
- 3.14. 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
M95 Hardware Design
M95_HD_V1.0 - 46 -
The reference design of 5V level match is shown as below. The construction of dotted line can
refer to the construction of solid line. Please pay attention to direction of connection. Input dotted
line of module should refer to input solid line of the module. Output dotted line of module should
refer to output solid line of the module.
MCU/ARM
/TXD
/RXD
1K
VDD_EXT
4.7k
VCC_MCU
4.7k
4.7k
4.7k
VDD_EXT
TXD
RXD
RTS
CTS
DTR
RI
/RTS
/CTS
voltage level: 5V
GND
VBAT
GPIO
STATUS
MODULE
GPIO
EINT
VCC_MCU
Figure 24: 5V level match circuit