Service Guide

LTE Standard Module Series
EG915U_Series_Hardware_Design 5 / 90
Contents
Safety Information ....................................................................................................................................... 3
About the Document ................................................................................................................................... 4
Contents ....................................................................................................................................................... 5
Table Index ................................................................................................................................................... 7
Figure Index ................................................................................................................................................. 9
1 Introduction ........................................................................................................................................ 11
1.1. Special Mark ............................................................................................................................ 11
2 Product Overview .............................................................................................................................. 12
2.1. Frequency Bands and Functions ............................................................................................ 12
2.2. Key Features ........................................................................................................................... 13
2.3. Functional Diagram ................................................................................................................. 15
2.4. Pin Assignment ........................................................................................................................ 17
2.5. Pin Description ........................................................................................................................ 18
2.6. EVB ......................................................................................................................................... 26
3 Operating Characteristics ................................................................................................................. 27
3.1. Operating Modes ..................................................................................................................... 27
3.2. Sleep Mode ............................................................................................................................. 27
3.2.1 UART Application Scenario ............................................................................................ 28
3.2.2. USB Application Scenario .............................................................................................. 29
3.2.2.1. USB Application with USB Remote Wakeup Function .................................... 29
3.2.2.2. USB Application with USB Suspend/Resume and MAIN_RI Function ........... 29
3.2.2.3. USB Application without USB Suspend Function ........................................... 30
3.3. Airplane Mode ......................................................................................................................... 31
3.3.1. Hardware ........................................................................................................................ 31
3.3.2. Software ......................................................................................................................... 32
3.4. Power Supply .......................................................................................................................... 32
3.4.1. Power Supply Pins ......................................................................................................... 32
3.4.2. Reference Design for Power Supply .............................................................................. 33
3.4.3. Voltage Stability Requirements ...................................................................................... 33
3.5. Turn On ................................................................................................................................... 35
3.5.1. Turn On with PWPKEY .................................................................................................. 35
3.6. Turn Off .................................................................................................................................... 36
3.6.1. Turn Off with PWPKEY .................................................................................................. 37
3.6.2. Turn Off with AT Command ............................................................................................ 37
3.7. Reset ....................................................................................................................................... 38
4 Application Interfaces ....................................................................................................................... 40
4.1. Analog Audio Interfaces .......................................................................................................... 40
4.1.1. Audio Interfaces Design Considerations........................................................................ 40
4.1.2. Microphone Interface Design ......................................................................................... 41