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 - 66 -
3.14. ADC
The module provides two ADC channel to measure the value of voltage. Please give priority to the
use of ADC0 channel. The command “AT+QADC” can read the voltage value applied on ADC0
pin, while AT command “AT+QEADC” can read the voltage value applied on ADC1 pin. For
details of this AT command, please refer to the document [1]. In order to improve the accuracy of
ADC, the layout of ADC should be surrounded by ground.
Table 25: Pin definition of the ADC
Name Pin Description
ADC0 2 General purpose analog to digital converter
ADC1 1 General purpose analog to digital converter
Table 26: Characteristics of the ADC
Parameter Min Typ Max Unit
Voltage Range 0 2.8 V
ADC Resolution 10 bit
ADC Accuracy 2.7 mV
3.15. Behaviors of the RI
Table 27: Behaviors of the RI
State RI response
Standby HIGH
Voice calling Change to LOW, then:
1. Change to HIGH when call is established.
2. Use ATH to hang up the call, RI changes to HIGH.
3. Calling part hangs up, RI changes to HIGH first, and changes to LOW for
120ms indicating “NO CARRIER” as an URC, then changes to HIGH
again.
4. Change to HIGH when SMS is received.
Data calling Change to LOW, then：
1. Change to HIGH when data connection is established.
2. Use AT H t o hang up the data calling, RI changes to HIGH.
3. Calling part hangs up, RI changes to HIGH first, and changes to LOW for
120ms indicating “NO CARRIER” as an URC, then changes to HIGH
again.
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