Table of Contents
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Contents
About the Document .................................................................................................................................. 2
Contents ...................................................................................................................................................... 3
Table Index .................................................................................................................................................. 4
Figure Index ................................................................................................................................................ 5
1
Introduction ......................................................................................................................................... 6
1.1.
Applicable Modules .................................................................................................................... 6
1.2.
Safety Information ...................................................................................................................... 7
2
PCB Design Overview ........................................................................................................................ 8
2.1.
Footprint and Keepout Area ....................................................................................................... 8
2.2.
Design Priorities and Considerations for PCB Traces ............................................................... 9
2.2.1.
Design Priorities .............................................................................................................. 9
2.2.2.
Design Considerations .................................................................................................... 9
3
Interface Design ................................................................................................................................ 10
3.1.
Power Supply ........................................................................................................................... 10
3.1.1.
DC-DC Converter .......................................................................................................... 10
3.1.2.
VBAT ............................................................................................................................. 11
3.2.
PWRKEY & RESET_N ............................................................................................................ 13
3.3.
USB Interface ........................................................................................................................... 14
3.3.1.
USB_DM & USB_DP Signals ....................................................................................... 14
3.3.2.
USB_VBUS Signal ........................................................................................................ 16
3.4.
Ethernet PHY ........................................................................................................................... 17
3.4.1.
SGMII Interface ............................................................................................................. 17
3.4.2.
Ethernet Components ................................................................................................... 19
3.5.
Audio Interfaces ....................................................................................................................... 20
3.5.1.
PCM Interface ............................................................................................................... 20
3.5.2.
Codec & Microphone & Speaker .................................................................................. 21
3.6.
SD Card Interface .................................................................................................................... 23
3.7.
WLAN Interface ........................................................................................................................ 25
3.8.
(U)SIM Interface ....................................................................................................................... 27
3.9.
ADC Interface ........................................................................................................................... 28
3.10. GPIOs ....................................................................................................................................... 29
3.11. Antenna Interfaces ................................................................................................................... 30
3.11.1. PCB Structures of Microstrip And Coplanar Waveguide .............................................. 30
3.11.1.1.
3.11.1.2.
3.11.2. Reference Design of RF Layout.................................................................................... 32
3.11.3. PCB Layout Considerations of Coplanar Waveguide ................................................... 33
4
Thermal Design ................................................................................................................................. 35
5
Appendix References ....................................................................................................................... 36
EC2x&EG2x-G_Series_PCB_Design_Guideline
PCB Structure of Microstrip Waveguide ............................................................ 30
PCB Structure of Coplanar Waveguide ............................................................. 30
LTE Standard Module Series
EC2x&EG2x-G Series PCB Design Guideline
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