Chapter 3
Schematic Checklist
The integrated circuitry of ESP32-S3 requires only 20 electrical components (resistors, capacitors, and inductors)
and a crystal, as well as an SPI ash. The high integration of ESP32-S3 allows for simple peripheral circuit design.
This chapter details the schematic design of ESP32-S3.
The following gure shows a reference schematic design of ESP32-S3. It can be used as the basis of your schematic
design.
Fig. 1: ESP32-S3 Reference Schematic
Note that Figure ESP32-S3 Reference Schematic shows the connection for 3.3 V, quad, o-package SPI ash/PSRAM.
• In cases where 1.8 V or 3.3 V, octal, in-package or o-package SPI ash/PSRAM is used, GPIO33 ~ GPIO37
are occupied and cannot be used for other functions.
• If an in-package SPI ash/PSRAM is utilized, where VDD_SPI is set at either 1.8 V or 3.3 V, GPIO45 will no
longer have any impact. In these scenarios, the presence of R1 is optional. However, in all other cases, refer to
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