Quectel EG915U Series, Hardware Design

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LTE Standard Module Series
EG915U_Series_Hardware_Design 5 / 81
Contents
Safety Information ....................................................................................................................................... 3
About the Document ................................................................................................................................... 4
Contents ....................................................................................................................................................... 5
Table Index ................................................................................................................................................... 7
Figure Index ................................................................................................................................................. 8
1 Introduction ........................................................................................................................................ 10
1.1. Special Mark ............................................................................................................................ 10
2 Product Overview .............................................................................................................................. 11
2.1. Frequency Bands and Functions ............................................................................................ 11
2.2. Key Features ........................................................................................................................... 12
2.3. Functional Diagram ................................................................................................................. 14
2.4. Pin Assignment ........................................................................................................................ 15
2.5. Pin Description ........................................................................................................................ 16
2.6. EVB ......................................................................................................................................... 24
3 Operating Characteristics ................................................................................................................. 25
3.1. Operating Modes ..................................................................................................................... 25
3.2. Sleep Mode ............................................................................................................................. 26
3.2.1 UART Application Scenario ............................................................................................ 26
3.2.2. USB Application Scenario .............................................................................................. 27
3.2.2.1. USB Application with USB Remote Wakeup Function ................................... 27
3.2.2.2. USB Application with USB Suspend/Resume and MAIN_RI Wakeup Function
29
3.3. Airplane Mode ......................................................................................................................... 30
3.3.1. Hardware ........................................................................................................................ 30
3.3.2. Software ......................................................................................................................... 30
3.4. Power Supply .......................................................................................................................... 30
3.4.1. Power Supply Pins ......................................................................................................... 30
3.4.2. Reference Design for Power Supply .............................................................................. 31
3.4.3. Requirements for Voltage Stability ................................................................................. 31
3.5. Turn on .................................................................................................................................... 32
3.5.1. Turn on with PWPKEY ................................................................................................... 32
3.6. Turn off .................................................................................................................................... 34
3.6.1. Turn off with PWPKEY ................................................................................................... 35
3.6.2. Turn off with AT Command ............................................................................................. 35
3.7. Reset ....................................................................................................................................... 36
4 Application Interfaces ....................................................................................................................... 38
4.1. Analog Audio Interfaces .......................................................................................................... 38
4.1.1. Audio Interfaces Design Considerations........................................................................ 38
4.1.2. Microphone Interface Design ......................................................................................... 39