User's Manual

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LTE Module
EC25-A User Manual
EC25-A_User_Manual Confidential / Released 3 / 7
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
Figure Index ................................................................................................................................................. 6
1 Introduction .......................................................................................................................................... 7
1.1. Safety Information ................................................................................................................... 7
2 Product Concept .................................................................................................................................. 9
2.1. General Description ................................................................................................................ 9
2.2. Directives and Standards ..................................................................................................... 10
2.2.1. FCC Statement ............................................................................................................. 10
2.3. Key Features .......................................................................................................................... 10
2.4. Functional Diagram ............................................................................................................... 12
2.5. Evaluation Board ................................................................................................................... 13
3 Application Interface ......................................................................................................................... 14
3.1. General Description .............................................................................................................. 14
3.2. Pin Assignment ...................................................................................................................... 14
3.3. Pin Description ...................................................................................................................... 16
3.4. Operating Modes ................................................................................................................... 21
3.5. Power Saving ......................................................................................................................... 22
3.5.1. Sleep Mode ................................................................................................................... 22
3.5.1.1. UART Application .............................................................................................. 22
3.5.1.2. USB Application with USB Remote Wakeup Function .................................. 23
3.5.1.3. USB Application with USB Suspend/Resume and RI Function .................... 23
3.5.1.4. USB Application without USB Suspend Function ......................................... 24
3.5.2. Airplane Mode .............................................................................................................. 25
3.6. Power Supply ......................................................................................................................... 25
3.6.1. Power Supply Pins ....................................................................................................... 25
3.6.2. Decrease Voltage Drop ................................................................................................ 26
3.6.3. Reference Design for Power Supply .......................................................................... 27
3.6.4. Monitor the Power Supply ........................................................................................... 28
3.7. Turn on and off Scenarios .................................................................................................... 28
3.7.1. Turn on Module Using the PWRKEY .......................................................................... 28
3.7.2. Turn off Module ............................................................................................................ 30
3.7.2.1. Turn off Module Using the PWRKEY Pin......................................................... 30
3.7.2.2. Turn off Module Using AT Command .............................................................. 30
3.8. Reset the Module ................................................................................................................... 30
3.9. USIM Card Interface .............................................................................................................. 32
3.10. USB Interface ......................................................................................................................... 34