Schematic Checklist - Espressif Systems ESP32 Hardware Design Manuallines

Chapter 3

Schematic Checklist

The integrated circuitry of ESP32 requires only 20 electrical components (resistors, capacitors, and inductors) and
a crystal, as well as an SPI flash. The high integration of ESP32 allows for simple peripheral circuit design. This
chapter details the schematic design of ESP32.
The following figure shows a reference schematic design of ESP32. It can be used as the basis of your schematic
design.
Note that Figure ESP32 Reference Schematic
s SCLK and flash can share the clock from SD_CLK or GPIO17.
• In cases where quad 1.8 V external flash/PSRAM is used, R9 should be populated.
• In cases where ESP32-D0WDR2-V3 with in-package quad 3.3 V PSRAM is used, the external flash can be
connected as Figure
• In cases where ESP32-U4WDH with in-package quad 3.3 V flash is used, the in-package flash is connected as
Figure ESP32 Schematic for Quad 3.3 V In-Package Flash
Any basic ESP32 circuit design may be broken down into the following major building blocks:
Fig. 1: ESP32 Reference Schematic
shows the connection for quad 3.3 V external flash/PSRAM. PSRAM'
ESP32 Reference Schematic shows.
shows.
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