LTE Module Series
EC20 Hardware Design
EC20_Hardware_Design Confidential / Released 3 / 78
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. Key Features ........................................................................................................................... 10
2.3. Functional Diagram ................................................................................................................. 12
2.4. Evaluation Board ..................................................................................................................... 13
3 Application Interface ......................................................................................................................... 14
3.1. General Description ................................................................................................................. 14
3.2. Pin Assignment ........................................................................................................................ 15
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 .............................................................................................. 27
3.7. Turn on and off Scenarios ....................................................................................................... 28
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 28
3.7.2. Turn off Module .............................................................................................................. 29
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 .......................................................................................................................... 33
3.11. UART Interface ........................................................................................................................ 35
3.12. PCM and I2C Interface ............................................................................................................ 37
3.13. ADC Function .......................................................................................................................... 39
3.14. Network Status Indication ........................................................................................................ 40
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