Espressif Systems ESP8684 Series, Hardware Design Manuallines, Page: 15 / 28

3 PCB Layout Design
3 PCB Layout Design
This chapter introduces the key points of how to design an ESP8684 PCB layout using the ESP8684-MINI-1
module as an example.
Figure 9: ESP8684 PCB Layout
3.1 General Principles of PCB Layout
It is recommended to use a four-layer PCB design:
• Layer 1 (TOP): Signal traces and components
• Layer 2 (GND): No signal traces here to ensure a complete GND plane
• Layer 3 (POWER): Route power traces here.
• Layer 4 (BOTTOM): It is not recommended to place any components on this layer. It is acceptable to route
signal traces on this layer when GND plane is applied.
A two-layer PCB design can also be used:
• Layer 1 (TOP): Signal traces and components
• Layer 2 (BOTTOM): Do not place any components on this layer and keep traces to a minimum. Ideally, it
should be a complete GND plane.
3.2 Positioning a Module on a Base Board
If module-on-board design is adopted, attention should be paid while positioning the module on the base board.
The interference of the base board on the module’s antenna performance should be minimized.
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ESP8684 Series Hardware Design Guidelines v1.1