Quectel UC20 - Table of Contents; Contents

UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 4 / 82
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 4
Table Index ................................................................................................................................................... 6
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 Interface ......................................................................................................................... 16
3.1. General Description ................................................................................................................. 16
3.2. Pin Assignment ........................................................................................................................ 17
3.3. Pin Description ......................................................................................................................... 18
3.4. Operating Modes ..................................................................................................................... 24
3.5. Power Saving ........................................................................................................................... 25
3.5.1. Sleep Mode .................................................................................................................... 25
3.5.1.1. UART Application ................................................................................................. 25
3.5.1.2. USB Application with Suspend Function ............................................................. 26
3.5.1.3. USB Application without Suspend Function ........................................................ 26
3.5.2. Airplane Mode ................................................................................................................ 27
3.6. Power Supply ........................................................................................................................... 28
3.6.1. Power Supply Pins ......................................................................................................... 28
3.6.2. Decrease Voltage Drop .................................................................................................. 28
3.6.3. Reference Design for Power Supply .............................................................................. 29
3.6.4. Monitor the Power Supply .............................................................................................. 30
3.7. Turn on and off Scenarios ....................................................................................................... 30
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 30
3.7.2. Turn off Module .............................................................................................................. 32
3.7.2.1. Turn off Module Using the PWRKEY Pin ............................................................. 32
3.7.2.2. Turn off Module Using AT Command ................................................................... 33
3.7.2.3. Automatic Shutdown ............................................................................................ 33
3.8. Reset the Module..................................................................................................................... 34
3.9. RTC Backup............................................................................................................................. 36
3.10. UART Interface ........................................................................................................................ 37
3.11. USIM Card Interface ................................................................................................................ 40
3.12. USB Interface .......................................................................................................................... 43
3.13. PCM and I2C Interface ............................................................................................................ 44
3.14. ADC Function .......................................................................................................................... 47
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