Product Info

LTE Standard Module Series
EG91 Hardware Design
EG91_Hardware_Design 4 / 93
Contents
About the Document .................................................................................................................................. 2
Contents ...................................................................................................................................................... 4
Table Index .................................................................................................................................................. 6
Figure Index ................................................................................................................................................ 8
1 Introduction ....................................................................................................................................... 10
1.1. Safety Information................................................................................................................... 11
2 Product Concept ............................................................................................................................... 12
2.1. General Description ................................................................................................................ 12
2.2. Key Features .......................................................................................................................... 13
2.3. Functional Diagram ................................................................................................................ 15
2.4. Evaluation Board .................................................................................................................... 16
3 Application Interfaces ...................................................................................................................... 17
3.1. General Description ................................................................................................................ 17
3.2. Pin Assignment ....................................................................................................................... 18
3.3. Pin Description ........................................................................................................................ 19
3.4. Operating Modes .................................................................................................................... 26
3.5. Power Saving .......................................................................................................................... 27
3.5.1. Sleep Mode ................................................................................................................... 27
3.5.1.1. UART Application ................................................................................................ 27
3.5.1.2. USB Application with USB Remote Wakeup Function ....................................... 28
3.5.1.3. USB Application with USB Suspend/Resume and RI Function ......................... 28
3.5.1.4. USB Application without USB Suspend Function ................................
............... 29
3.5.2. Airplane Mode ............................................................................................................... 30
3.6. Power Supply .......................................................................................................................... 30
3.6.1. Power Supply Pins ........................................................................................................ 30
3.6.2. Decrease Voltage Drop ................................................................................................. 31
3.6.3. Reference Design for Power Supply ............................................................................. 32
3.6.4. Monitor the Power Supply ............................................................................................. 32
3.7. Power-on/off Scenarios .......................................................................................................... 33
3.7.1. Turn on Module Using the PWRKEY ............................................................................ 33
3.7.2. Turn off Module ............................................................................................................. 35
3.7.2.1. Turn off Module Using the PWRKEY Pin ............................................................ 35
3.7.2.2. Turn off Module Using AT Command .................................................................. 35
3.8. Reset the Module.................................................................................................................... 36
3.9. (U)SIM Interfaces.................................................................................................................... 37
3.10. USB Interface ......................................................................................................................... 40
3.11. UART Interfaces ..................................................................................................................... 42
3.12. PCM and I2C Interfaces ......................................................................................................... 44
3.13. SPI Interface ........................................................................................................................... 47
3.14. Network Status Indication ....................................................................................................... 47