User's Manual

LTE Module
EC20 Hardware Design
EC20_Hardware_Design Confidential / Released 3 / 83
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
Figure Index ................................................................................................................................................. 6
1 Introduction .......................................................................................................................................... 7
1.1. Safety Information...................................................................................................................... 8
2 Product Concept .................................................................................................................................. 9
2.1. General Description ................................................................................................................... 9
2.2. Directives and Standards ......................................................................................................... 10
2.2.1. FCC Statement ............................................................................................................... 10
2.2.2. FCC Radiation Exposure Statement .............................................................................. 10
2.3. Key Features ........................................................................................................................... 11
2.4. Functional Diagram ................................................................................................................. 13
2.5. Evaluation Board ..................................................................................................................... 14
3 Application Interface ......................................................................................................................... 15
3.1. General Description ................................................................................................................. 15
3.2. Pin Assignment ........................................................................................................................ 16
3.3. Pin Description ......................................................................................................................... 17
3.4. Operating Modes ..................................................................................................................... 22
3.5. Power Saving ........................................................................................................................... 23
3.5.1. Sleep Mode .................................................................................................................... 23
3.5.1.1. UART Application ................................................................................................. 23
3.5.1.2. USB Application with USB Remote Wakeup Function ........................................ 24
3.5.1.3. USB Application with USB Suspend/Resume and RI Function .......................... 25
3.5.1.4. USB Application without USB Suspend Function ................................................ 25
3.5.2. Airplane Mode ................................................................................................................ 26
3.6. Power Supply ........................................................................................................................... 27
3.6.1. Power Supply Pins ......................................................................................................... 27
3.6.2. Decrease Voltage Drop .................................................................................................. 27
3.6.3. Reference Design for Power Supply .............................................................................. 28
3.6.4. Monitor the Power Supply .............................................................................................. 29
3.7. Turn on and off Scenarios ....................................................................................................... 29
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 29
3.7.2. Turn off Module .............................................................................................................. 31
3.7.2.1. Turn off Module Using the PWRKEY Pin ............................................................. 31
3.7.2.2. Turn off Module Using AT Command ................................................................... 32
3.8. Reset the Module..................................................................................................................... 32
3.9. USIM Card Interface ................................................................................................................ 34
3.10. USB Interface .......................................................................................................................... 36
3.11. UART Interface ........................................................................................................................ 37
3.12. PCM and I2C Interface ............................................................................................................ 40