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
