Quectel EC21 Series Hardware Design

Also see for EC21 Series: Command manual Hardware design

Contents

Quectel EC21 Series Hardware Design Manual pdf 5 page image

LTE Module SeriesEC21 Hardware DesignEC21_Hardware_Design Confidential / Released 4 / 94ContentsAbout the Document ................................................................................................................................ 2Contents .................................................................................................................................................... 4Table Index ............................................................................................................................................... 6Figure Index .............................................................................................................................................. 81 Introduction ..................................................................................................................................... 101.1. Safety Information ..................................................................................................................112 Product Concept ............................................................................................................................. 122.1. General Description .............................................................................................................. 122.2. Key Features ......................................................................................................................... 132.3. Functional Diagram ............................................................................................................... 162.4. Evaluation Board ................................................................................................................... 163 Application Interfaces ..................................................................................................................... 173.1. General Description .............................................................................................................. 173.2. Pin Assignment ..................................................................................................................... 183.3. Pin Description ...................................................................................................................... 193.4. Operating Modes .................................................................................................................. 283.5. Power Saving ........................................................................................................................ 283.5.1. Sleep Mode.................................................................................................................. 283.5.1.1. UART Application ............................................................................................... 283.5.1.2. USB Application with USB Remote Wakeup Function ....................................... 293.5.1.3. USB Application with USB Suspend/Resume and RI Function .......................... 303.5.1.4. USB Application without USB Suspend Function............................................... 313.5.2. Airplane Mode.............................................................................................................. 323.6. Power Supply ........................................................................................................................ 323.6.1. Power Supply Pins....................................................................................................... 323.6.2. Decrease Voltage Drop ................................................................................................ 333.6.3. Reference Design for Power Supply ............................................................................ 343.6.4. Monitor the Power Supply ............................................................................................ 353.7. Turn on and off Scenarios ..................................................................................................... 353.7.1. Turn on Module Using the PWRKEY ........................................................................... 353.7.2. Turn off Module ............................................................................................................ 373.7.2.1. Turn off Module Using the PWRKEY Pin ........................................................... 373.7.2.2. Turn off Module Using AT Command ................................................................. 373.8. Reset the Module .................................................................................................................. 383.9. USIM Card Interface ............................................................................................................. 393.10. USB Interface ........................................................................................................................ 413.11. UART Interfaces.................................................................................................................... 433.12. PCM and I2C Interfaces ........................................................................................................ 453.13. ADC Function ........................................................................................................................ 483.14. Network Status Indication ..................................................................................................... 49QuectelConfidential