2. Schematic Checklist and PCB Layout Design
Figure 17: ESP32 RF Layout in a Four-layer PCB Design
Figure 18: ESP32 RF Layout in a Two-layer PCB Design
2.2.1.6 External RC
External resistors and capacitors should be placed close to the chip pins, and there should be no vias around the
traces. Please ensure that 10 nF capacitors are placed close to the pins.
2.2.1.7 UART
The series resistor on the U0TXD line needs to be placed as close to the chip as possible. The U0TXD and U0RXD
traces on the top layer should be as short as possible. Employ vias around the traces for isolation.
Figure 19 below shows an example of UART design.
Espressif Systems 14 ESP32 Hardware Design Guidelines V2.7
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