Table Of Contents; Contents - Quectel EC21 Series Hardware Design

Contents

Safety Information...................................................................................................................................................... 3
About the Document..................................................................................................................................................5
Contents........................................................................................................................................................................9
Table Index.................................................................................................................................................................12
Figure Index............................................................................................................................................................... 14
1 Introduction....................................................................................................................................................... 16
1.1. Special Marks........................................................................................................................................ 18
2 Product Overview.............................................................................................................................................19
2.1. Frequency Bands and
2.2. Key Features......................................................................................................................................... 20
2.3. Functional
2.4. EVB......................................................................................................................................................... 24
3 Application Interfaces.....................................................................................................................................25
3.1. General Description..............................................................................................................................25
3.2. Pin Assignment..................................................................................................................................... 26
3.3. Pin Description...................................................................................................................................... 27
3.4. Operating
3.5. Power Saving........................................................................................................................................ 37
3.5.1. Sleep
3.5.1.1.
3.5.1.2.
3.5.1.3.
3.5.1.4.
3.5.2. Airplane
3.6. Power Supply........................................................................................................................................ 41
3.6.1. Power Supply
3.6.2. Voltage Stability
3.6.3. Reference Design for Power
3.6.4. Monitor the Power
3.7. Power-on/off
3.7.1. Turn on with
3.7.2. Turn off
3.7.2.1.
3.7.2.2.
3.8. Reset.......................................................................................................................................................46
3.9. (U)SIM Interface....................................................................................................................................48
3.10. USB Interface........................................................................................................................................ 51
3.11. UART Interfaces....................................................................................................................................52
3.12. PCM and I2C
3.13. SD Card Interface................................................................................................................................. 57
EC21_Series_Hardware_Design
Functions....................................................................................................... 19
Diagram.............................................................................................................................. 23
Modes.................................................................................................................................. 37
Mode................................................................................................................................. 37
UART Application Scenario........................................................................................... 37
USB Application with USB Remote Wakeup
USB Application with USB Suspend/Resume and RI
USB Application Without USB Suspend
Mode.............................................................................................................................40
Pins.....................................................................................................................41
Requirements................................................................................................41
Supply.........................................................................................................43
Scenarios....................................................................................................................... 43
PWRKEY.............................................................................................................. 43
Module...........................................................................................................................45
Turn off with PWRKEY...................................................................................................46
Turn off with AT Command............................................................................................ 46
Interfaces...................................................................................................................... 54
Function............................................. 38
Function.....................................................39
Supply.......................................................................................42
LTE Standard Module Series
Function.............................. 39
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