Quectel EG91 Series User Manual

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

Quectel EG91 Series Specifications

General

Brand	Quectel
Model	EG91 Series
Category	Control Unit
Language	English