Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 6 / 126
Contents
About the Document ................................................................................................................................... 1
Contents ....................................................................................................................................................... 6
Table Index ................................................................................................................................................... 9
Figure Index ............................................................................................................................................... 11
1 Introduction ........................................................................................................................................ 13
1.1. FCC Certification Requirements. ............................................................................................. 13
1.2. Safety Information.................................................................................................................... 16
2 Product Concept ................................................................................................................................ 17
2.1. General Description ................................................................................................................. 17
2.2. Key Features ........................................................................................................................... 18
2.3. 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 ................................................................................................. 36
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 ................................................ 38
3.5.2. Airplane Mode ................................................................................................................ 39
3.6. Power Supply ........................................................................................................................... 40
3.6.1. Power Supply Pins ......................................................................................................... 40
3.6.2. Decrease Voltage Drop .................................................................................................. 40
3.6.3. Reference Design for Power Supply .............................................................................. 41
3.6.4. Monitor the Power Supply .............................................................................................. 41
3.7. Power-on/off Scenarios ........................................................................................................... 42
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 42
3.7.2. Turn off Module .............................................................................................................. 44
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 ........................................................................................................................... 45
3.9. (U)SIM Interface ...................................................................................................................... 47
3.10. USB Interface .......................................................................................................................... 49
3.11. UART Interfaces ...................................................................................................................... 50
3.12. PCM and I2C Interfaces .......................................................................................................... 53