Users Manual

LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design
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Contents
About the Document..................................................................................................................................................2
Contents........................................................................................................................................................................6
Table Index................................................................................................................................................................... 9
Figure Index............................................................................................................................................................... 11
1 Introduction....................................................................................................................................................... 13
1.1. Safety Information.................................................................................................................................16
2 Product Concept...............................................................................................................................................17
2.1. General Description..............................................................................................................................17
2.2. Key Features......................................................................................................................................... 18
2.3. Functional Diagram.............................................................................................................................. 21
2.4. Evaluation Board...................................................................................................................................22
3 Application Interfaces.....................................................................................................................................23
3.1. General Description..............................................................................................................................23
3.2. Pin Assignment..................................................................................................................................... 24
3.3. Pin Description...................................................................................................................................... 25
3.4. Operating Modes.................................................................................................................................. 37
3.5. Power Saving........................................................................................................................................ 37
3.5.1. Sleep Mode................................................................................................................................. 37
3.5.1.1. UART Application............................................................................................................37
3.5.1.2. USB Application with USB Remote Wakeup Function.............................................38
3.5.1.3. USB Application with USB Suspend/Resume and RI Function..............................39
3.5.1.4. USB Application without USB Suspend Function..................................................... 39
3.5.2. Airplane Mode.............................................................................................................................40
3.6. Power Supply........................................................................................................................................ 41
3.6.1. Power Supply Pins..................................................................................................................... 41
3.6.2. Decrease Voltage Drop.............................................................................................................41
3.6.3. Reference Design for Power Supply.......................................................................................42
3.6.4. Monitor the Power Supply.........................................................................................................43
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................................................................... 46
3.7.2.2. Turn off Module Using AT Command..........................................................................46
3.8. Reset Module........................................................................................................................................ 46
3.9. (U)SIM Interface....................................................................................................................................48
3.10. USB Interface........................................................................................................................................ 50
3.11. UART Interfaces................................................................................................................................... 52
3.12. PCM and I2C Interfaces...................................................................................................................... 54
3.13. SD Card Interface................................................................................................................................. 56
3.14. Wireless Connectivity Interfaces........................................................................................................58