LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 6 / 130
Contents
About the Document ................................................................................................................................ 2
Contents .................................................................................................................................................... 6
Table Index ............................................................................................................................................... 9
Figure Index ............................................................................................................................................ 11
1 Introduction ..................................................................................................................................... 13
1.1. Safety Information ................................................................................................................. 14
2 Product Concept ............................................................................................................................. 16
2.1. General Description .............................................................................................................. 16
2.2. Key Features ......................................................................................................................... 17
2.3. Functional Diagram ............................................................................................................... 20
2.4. Evaluation Board ................................................................................................................... 21
3 Application Interfaces ..................................................................................................................... 22
3.1. General Description .............................................................................................................. 22
3.2. Pin Assignment ..................................................................................................................... 23
3.3. Pin Description ...................................................................................................................... 24
3.4. Operating Modes .................................................................................................................. 36
3.5. Power Saving ........................................................................................................................ 36
3.5.1.
Sleep Mode.................................................................................................................. 36
3.5.1.1. UART Application .............................................................................................. 37
3.5.1.2. USB Application with USB Remote Wakeup Function ....................................... 37
3.5.1.3. USB Application with USB Suspend/Resume and RI Function.......................... 38
3.5.1.4. USB Application without USB Suspend Function .............................................. 39
3.5.2. Airplane Mode .............................................................................................................. 39
3.6. Power Supply ........................................................................................................................ 40
3.6.1. Power Supply Pins ....................................................................................................... 40
3.6.2. Decrease Voltage Drop ............................................................................................... 41
3.6.3. Reference Design for Power Supply ............................................................................ 42
3.6.4. Monitor the Power Supply ............................................................................................ 42
3.7. Power-on/off Scenarios ......................................................................................................... 43
3.7.1. Turn on Module Using the PWRKEY ........................................................................... 43
3.7.2. Turn off Module ............................................................................................................ 45
3.7.2.1. Turn off Module Using the PWRKEY Pin ........................................................... 45
3.7.2.2. Turn off Module Using AT Command ................................................................ 45
3.8. Reset Module ........................................................................................................................ 46
3.9. (U)SIM Interface .................................................................................................................... 47
3.10. USB Interface ........................................................................................................................ 50
3.11. UART Interfaces ................................................................................................................... 51
3.12. PCM and I2C Interfaces ........................................................................................................ 54
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