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 - 67 -
4. Change to HIGH when SMS is received.
SMS When a new SMS comes, the RI changes to LOW and holds low level for
about 120 ms, then changes to HIGH.
URC Certain URCs can trigger 120ms low level on RI. For more details, please
refer to the document [1]
If the module is used as a caller, the RI would maintain high except the URC or SMS is received.
On the other hand, when it is used as a receiver, the timing of the RI is shown below.
RI
Idle Ring
Off-hook by“ATA”
On-hook by “ATH”
SMS received
HIGH
LOW
Figure 43: RI behavior of voice calling as a receiver
RI
Idle Ring
Data calling establish
SMS received
HIGH
LOW
On-hook by “ATH”
Figure 44
: RI behavior of data calling as a receiver
RI
Idle Calling
On-hook
Talking
HIGH
LOW
Idle
Figure 45
: RI behavior as a caller
Quecctel
Confidential