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PCB Layout Design
3. PCB Layout Design
This chapter takes ESP32-C3-WROOM-02 module as an example to illustrate key points of ESP32-C3 family
PCB layout.
Figure 11: ESP32C3 Family PCB Layout
3.1 General Principles of PCB Layout
We recommend a four-layer PCB design.
• The first layer is the TOP layer for signal traces and components.
• The second layer is the GND layer without signal traces being routed so as to ensure a complete GND
plane.
• The third layer is the POWER layer where a GND plane should be applied to better isolate the RF module
and crystal. It is acceptable to route signal traces on this layer, provided that there is a complete GND plane
under the RF module and crystal.
• The fourth layer is the BOTTOM layer, where power traces are routed. It is not recommended to place any
components on this layer.
Below are the suggestions for a two-layer PCB design.
• The first layer is the TOP layer for traces and components.
• The second layer is the BOTTOM layer. Please do not place any components on this layer and keep traces
to a minimum. Ideally, it should be a complete GND plane.
3.2 Placement of Module on the Base Board
If you design an on-board module, please pay attention to the placement of the module on the base board. The
aim is to minimize the impact of the base board on the module’s antenna performance.
Espressif Systems
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ESP32-C3 Family Hardware Design Guidelines V1.0
