Quectel EG21-G - Table of Contents; Contents

LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 3 / 100
Contents
About the Document ................................................................................................................................ 2
Contents .................................................................................................................................................... 3
Table Index ............................................................................................................................................... 5
Figure Index .............................................................................................................................................. 7
1 Introduction ....................................................................................................................................... 9
1.1. Safety Information ................................................................................................................. 10
2 Product Concept ............................................................................................................................. 11
2.1. General Description ...............................................................................................................11
2.2. Key Features ......................................................................................................................... 12
2.3. Functional Diagram ............................................................................................................... 14
2.4. Evaluation Board ................................................................................................................... 15
3 Application Interfaces ..................................................................................................................... 16
3.1. General Description .............................................................................................................. 16
3.2. Pin Assignment ..................................................................................................................... 17
3.3. Pin Description ...................................................................................................................... 18
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 Suspension/Resume and RI Function ..................... 29
3.5.1.4. USB Application without USB Suspension Function .......................................... 30
3.5.2. Airplane Mode .............................................................................................................. 30
3.6. Power Supply ........................................................................................................................ 31
3.6.1. Power Supply Pins ....................................................................................................... 31
3.6.2. Decrease Voltage Drop ................................................................................................ 32
3.6.3. Reference Design for Power Supply ............................................................................ 33
3.6.4. Monitor the Power Supply ............................................................................................ 33
3.7. Power-on and off Scenarios .................................................................................................. 34
3.7.1. Turn on Module Using the PWRKEY ........................................................................... 34
3.7.2. Turn off Module ............................................................................................................ 35
3.7.2.1. Turn off Module Using the PWRKEY Pin ........................................................... 36
3.7.2.2. Turn off Module Using AT Command ................................................................. 36
3.8. Reset the Module .................................................................................................................. 36
3.9. (U)SIM Interface .................................................................................................................... 38
3.10. USB Interface ........................................................................................................................ 40
3.11. UART Interfaces .................................................................................................................... 42
3.12. PCM and I2C Interfaces ........................................................................................................ 44
3.13. SD Card Interface ................................................................................................................. 46
3.14. ADC Interfaces ...................................................................................................................... 48
3.15. Network Status Indication ..................................................................................................... 49
3.16. STATUS ................................................................................................................................ 50