LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 5 / 106
Contents
About the Document ................................................................................................................................ 2
Contents .................................................................................................................................................... 5
Table Index ............................................................................................................................................... 7
Figure Index .............................................................................................................................................. 9
1
Introduction ..................................................................................................................................... 11
1.1.
Safety Information ................................................................................................................. 14
2
Product Concept ............................................................................................................................. 15
2.1.
General Description .............................................................................................................. 15
2.2.
Key Features ......................................................................................................................... 16
2.3.
Functional Diagram ............................................................................................................... 19
2.4.
Evaluation Board ................................................................................................................... 20
3
Application Interfaces ..................................................................................................................... 21
3.1.
General Description .............................................................................................................. 21
3.2.
Pin Assignment ..................................................................................................................... 22
3.3.
Pin Description ...................................................................................................................... 23
3.4.
Operating Modes .................................................................................................................. 30
3.5.
Power Saving ........................................................................................................................ 31
3.5.1.
Sleep Mode.................................................................................................................. 31
3.5.1.1.
UART Application ............................................................................................... 31
3.5.1.2.
USB Application with USB Remote Wakeup Function ....................................... 32
3.5.1.3.
USB Application with USB Suspend/Resume and RI Function .......................... 32
3.5.1.4.
USB Application without USB Suspend Function ............................................... 33
3.5.2.
Airplane Mode .............................................................................................................. 34
3.6.
Power Supply ........................................................................................................................ 34
3.6.1.
Power Supply Pins ....................................................................................................... 34
3.6.2.
Decrease Voltage Drop ................................................................................................ 35
3.6.3.
Reference Design for Power Supply ............................................................................ 36
3.6.4.
Monitor the Power Supply ............................................................................................ 36
3.7.
Power-on/off Scenarios ......................................................................................................... 37
3.7.1.
Turn on Module Using the PWRKEY ........................................................................... 37
3.7.2.
Turn off Module ............................................................................................................ 39
3.7.2.1.
Turn off Module Using the PWRKEY Pin ........................................................... 39
3.7.2.2.
Turn off Module Using AT Command ................................................................. 39
3.8.
Reset the Module .................................................................................................................. 40
3.9.
(U)SIM Interfaces .................................................................................................................. 41
3.10.
USB Interface ........................................................................................................................ 44
3.11.
UART Interfaces ................................................................................................................... 45
3.12.
PCM and I2C Interfaces ........................................................................................................ 48
3.13.
SPI Interface ......................................................................................................................... 51
3.14.
Network Status Indication ..................................................................................................... 52
