Contents
About the Document ................................................................................................................................ 2
Contents .................................................................................................................................................... 4
Table Index ............................................................................................................................................... 6
Figure Index .............................................................................................................................................. 8
1
Introduction ..................................................................................................................................... 10
1.1.
Safety Information ..................................................................................................................11
2
Product Concept ............................................................................................................................. 12
2.1.
General Description .............................................................................................................. 12
2.2.
Key Features ......................................................................................................................... 13
2.3.
Functional Diagram ............................................................................................................... 16
2.4.
Evaluation Board ................................................................................................................... 16
3
Application Interfaces ..................................................................................................................... 17
3.1.
General Description .............................................................................................................. 17
3.2.
Pin Assignment ..................................................................................................................... 18
3.3.
Pin Description ...................................................................................................................... 19
3.4.
Operating Modes .................................................................................................................. 28
3.5.
Power Saving ........................................................................................................................ 28
3.5.1.
Sleep Mode.................................................................................................................. 28
3.5.1.1.
3.5.1.2.
3.5.1.3.
3.5.1.4.
3.5.2.
Airplane Mode .............................................................................................................. 32
3.6.
Power Supply ........................................................................................................................ 32
3.6.1.
Power Supply Pins ....................................................................................................... 32
3.6.2.
Decrease Voltage Drop ................................................................................................ 33
3.6.3.
3.6.4.
Monitor the Power Supply ............................................................................................ 35
3.7.
Turn on and off Scenarios ..................................................................................................... 35
3.7.1.
3.7.2.
Turn off Module ............................................................................................................ 37
3.7.2.1.
3.7.2.2.
3.8.
Reset the Module .................................................................................................................. 38
3.9.
USIM Card Interface ............................................................................................................. 39
3.10.
USB Interface ........................................................................................................................ 41
3.11.
UART Interfaces .................................................................................................................... 43
3.12.
PCM and I2C Interfaces ........................................................................................................ 45
3.13.
ADC Function ........................................................................................................................ 48
3.14.
Network Status Indication ..................................................................................................... 49
EC21_Hardware_Design
UART Application ............................................................................................... 28
Confidential / Released
LTE Module Series
EC21 Hardware Design
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