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 - 25 -
0.15×VDD_EXT
Debug Port
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
DBG_TXD 42 O UART interface for
debugging only.
VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
If unused, keep
these pins open.
DBG_RXD 43 I
Auxiliary UART Port
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
TXD_AUX 40 O Transmit data VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
If unused, keep
these pins open.
RXD_AUX 41 I Receive data
SIM interface
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
SIM_VDD 56 O Power supply for
SIM card
The voltage can be
selected by firmware
automatically. Either
1.8V or 3V.
All signals of
SIM interface
should be
protected against
ESD with a TVS
diode array.
Maximum cable
length is 200mm
from the module
pad to SIM card
SIM_DATA 54 I/O SIM data 3V：
VOLmax=0.4
VOHmin=
SIM_VDD-0.4
1.8V:
VOLmax=
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