Quectel EG25-G, Проектирование аппаратного обеспечения, Страница: 4 / 103

LTE Module Series
EG25-G Hardware Design
EG25-G_Hardware_Design 3 / 100
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
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 Interfaces ....................................................................................................................... 16
3.1.
General Description ................................................................................................................. 16
3.2.
Pin Assignment ........................................................................................................................ 17
3.3.
Pin Description ......................................................................................................................... 18
3.4.
Operating Modes ..................................................................................................................... 29
3.5.
Power Saving ........................................................................................................................... 30
3.5.1. Sleep Mode .................................................................................................................... 30
3.5.1.1. UART Application ................................................................................................. 30
3.5.1.2. USB Application with USB Remote Wakeup Function ........................................ 31
3.5.1.3. USB Application with USB Suspension/Resume and RI Function ...................... 31
3.5.1.4. USB Application without USB Suspension Function ........................................... 32
3.5.2. Airplane Mode ................................................................................................................ 33
3.6.
Power Supply ........................................................................................................................... 33
3.6.1. Power Supply Pins ......................................................................................................... 33
3.6.2. Decrease Voltage Drop .................................................................................................. 34
3.6.3. Reference Design for Power Supply .............................................................................. 35
3.6.4. Monitor the Power Supply .............................................................................................. 36
3.7.
Power-on and off Scenarios .................................................................................................... 36
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 36
3.7.2.
Turn off Module .............................................................................................................. 38
3.7.2.1. Turn off Module Using the PWRKEY Pin ............................................................. 38
3.7.2.2. Turn off Module Using AT Command ................................................................... 38
3.8.
Reset the Module..................................................................................................................... 39
3.9.
(U)SIM Interface ...................................................................................................................... 40
3.10.
USB Interface .......................................................................................................................... 43
3.11.
UART Interfaces ...................................................................................................................... 44
3.12.
PCM and I2C Interfaces .......................................................................................................... 47
3.13.
SD Card Interface .................................................................................................................... 49
3.14.
Wireless Connectivity Interfaces ............................................................................................. 51
3.14.1. WLAN Interface .............................................................................................................. 53
3.14.2. BT Interface* .................................................................................................................. 54