Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 3 / 82
Contents
About the Document ................................................................................................................................ 2
Contents .................................................................................................................................................... 3
Table Index ............................................................................................................................................... 6
Figure Index .............................................................................................................................................. 7
1 Introduction ....................................................................................................................................... 9
1.1. Safety Information ................................................................................................................. 10
2 Product Concept ............................................................................................................................. 12
2.1. General Description .............................................................................................................. 12
2.2. Key Features ......................................................................................................................... 12
2.3. Functional Diagram ............................................................................................................... 15
2.4. Evaluation Board ................................................................................................................... 16
3 Application Interface ....................................................................................................................... 17
3.1. Pin of Module ........................................................................................................................ 18
3.1.1. Pin Assignment ............................................................................................................ 18
3.1.2. Pin Description ............................................................................................................. 19
3.2. Operating Modes .................................................................................................................. 23
3.3. Power Supply ........................................................................................................................ 24
3.3.1. Power Features of Module ........................................................................................... 24
3.3.2. Decrease Supply Voltage Drop .................................................................................... 25
3.3.3. Reference Design For Power Supply ........................................................................... 26
3.3.4. Monitor Power Supply .................................................................................................. 26
3.4. Power On and Down Scenarios ............................................................................................ 27
3.4.1. Power On ..................................................................................................................... 27
3.4.2. Power Down ................................................................................................................ 29
3.4.2.1. Power Down Module Using the PWRKEY Pin ................................................. 29
3.4.2.2. Power Down Module Using AT Command ....................................................... 30
3.4.2.3. Under-voltage Automatic Shutdown ................................................................ 30
3.4.3. Restart ......................................................................................................................... 31
3.5. Power Saving ........................................................................................................................ 31
3.5.1. Minimum Functionality Mode ....................................................................................... 31
3.5.2. SLEEP Mode ............................................................................................................... 32
3.5.3. Wake Up Module From SLEEP Mode .......................................................................... 32
3.5.4. Summary of State Transition ........................................................................................ 33
3.6. RTC Backup .......................................................................................................................... 33
3.7. Serial Interfaces .................................................................................................................... 35
3.7.1.
UART Port ................................................................................................................... 37
3.7.1.1. The Feature of UART Port ............................................................................... 37
3.7.1.2. The Connection of UART ................................................................................ 38
3.7.1.3. Firmware Upgrade ........................................................................................... 40
3.7.2. Debug Port................................................................................................................... 40