Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 5 / 112
Contents
About the Document ................................................................................................................................ 2
Contents .................................................................................................................................................... 5
Table Index ............................................................................................................................................... 8
Figure Index ............................................................................................................................................ 10
1 Introduction ..................................................................................................................................... 12
1.1. Safety Information ................................................................................................................. 13
2 Product Concept ............................................................................................................................. 18
2.1. General Description .............................................................................................................. 18
2.2. Key Features ......................................................................................................................... 19
2.3. Functional Diagram ............................................................................................................... 22
2.4. Evaluation Board ................................................................................................................... 23
3 Application Interfaces ..................................................................................................................... 24
3.1. General Description .............................................................................................................. 24
3.2. Pin Assignment ..................................................................................................................... 25
3.3. Pin Description ...................................................................................................................... 26
3.4. Operating Modes .................................................................................................................. 38
3.5. Power Saving ........................................................................................................................ 38
3.5.1.
Sleep Mode.................................................................................................................. 38
3.5.1.1. UART Application .............................................................................................. 38
3.5.1.2. USB Application with USB Remote Wakeup Function ....................................... 39
3.5.1.3. USB Application with USB Suspend/Resume and RI Function.......................... 40
3.5.1.4. USB Application without USB Suspend Function .............................................. 41
3.5.2. Airplane Mode .............................................................................................................. 41
3.6. Power Supply ........................................................................................................................ 42
3.6.1. Power Supply Pins ....................................................................................................... 42
3.6.2. Decrease Voltage Drop ............................................................................................... 43
3.6.3. Reference Design for Power Supply ............................................................................ 44
3.6.4. Monitor the Power Supply ............................................................................................ 44
3.7. Turn on and off Scenarios ..................................................................................................... 44
3.7.1. Turn on Module Using the PWRKEY ........................................................................... 44
3.7.2. Turn off Module ............................................................................................................ 46
3.7.2.1. Turn off Module Using the PWRKEY Pin ........................................................... 46
3.7.2.2. Turn off Module Using AT Command ................................................................ 47
3.8. Reset the Module .................................................................................................................. 47
3.9.
(U)SIM Interface .................................................................................................................... 49
3.10. USB Interface ........................................................................................................................ 51
3.11. UART Interfaces ................................................................................................................... 53
3.12. PCM and I2C Interfaces ........................................................................................................ 55
3.13. SD Card Interface ................................................................................................................. 58
3.14. ADC Interfaces ...................................................................................................................... 60