Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
9
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Contents
Safety Information...................................................................................................................................................... 3
About the Document..................................................................................................................................................5
Contents........................................................................................................................................................................9
Table Index.................................................................................................................................................................11
Figure Index............................................................................................................................................................... 13
1 Introduction....................................................................................................................................................... 15
2 Product Concept...............................................................................................................................................17
2.1. General Description..............................................................................................................................17
2.2. Key Features......................................................................................................................................... 18
2.3. Functional Diagram.............................................................................................................................. 21
2.4. Evaluation Board...................................................................................................................................22
3 Application Interfaces.....................................................................................................................................23
3.1. General Description..............................................................................................................................23
3.2. Pin Assignment..................................................................................................................................... 24
3.3. Pin Description...................................................................................................................................... 25
3.4. Operating Modes.................................................................................................................................. 32
3.5. Power Saving........................................................................................................................................ 32
3.5.1. Sleep Mode................................................................................................................................. 32
3.5.2. Airplane Mode.............................................................................................................................35
3.6. Power Supply........................................................................................................................................ 36
3.6.1. Power Supply Pins.....................................................................................................................36
3.6.2. Decrease Voltage Drop............................................................................................................. 36
3.6.3. Reference Design for Power Supply.......................................................................................38
3.6.4. Monitor the Power Supply.........................................................................................................38
3.7. Power-on/off Scenarios....................................................................................................................... 38
3.7.1. Turn on Module Using the PWRKEY......................................................................................38
3.7.2. Turn off Module...........................................................................................................................40
3.8. Reset the Module..................................................................................................................................42
3.9. (U)SIM Interfaces..................................................................................................................................43
3.10. USB Interface........................................................................................................................................ 46
3.11. UART Interfaces................................................................................................................................... 47
3.12. PCM and I2C Interfaces...................................................................................................................... 49
3.13. SPI Interface.......................................................................................................................................... 52
3.14. Network Status Indication....................................................................................................................53
3.15. STATUS................................................................................................................................................. 54
3.16. ADC Interface........................................................................................................................................54
3.17. Behaviors of RI......................................................................................................................................55
3.18. USB_BOOT Interface.......................................................................................................................... 56
4 GNSS Receiver..................................................................................................................................................58