Uart; Usb; Typical Layout Problems And Solutions - Espressif Systems ESP32-H2 Series Hardware Design Manuallines

3 PCB Layout Design

3.6 UART

• The series resistor on the U0TXD trace needs to be placed close to the ESP32-H2 chip side and away from
the crystal.
• The U0TXD and U0RXD traces on the top layer should be as short as possible.
• The UART trace should be surrounded by ground copper and ground vias stitching.

3.7 USB

• Place the RC circuit on the USB traces close to the ESP32-H2 chip side.
• Please use differential pairs and route them in parallel at equal lengths.
• Make sure there is a complete reference ground plane and surround the USB traces with ground copper.

3.8 Typical Layout Problems and Solutions

Espressif Systems
Figure 19: ESP32-H2 Stub in a Four-layer PCB Design
Figure 20: ESP32-H2 UART0 Layout
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ESP32-H2 Series Hardware Design Guidelines v0.5