Revision History

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Revision History

Date	Version	Release Notes
2025-09-17	v1.9	PCB Layout Design Added Figure Placement of ESP32 Modules on Base Board (antenna feed point on the left) Updated Figure Placement of ESP32 Modules on Base Board (antenna feed point on the right)
2025-07-23	v1.8	Improved wording throughout the document
2025-05-23	v1.7	PCB Layout Design Section SDIO: Updated descriptions about the SDIO layout guidelines Section Crystal: Updated descriptions about the crystal layout guidelines
2024-12-27	v1.6	Schematic Checklist Section RTC Clock Source (Optional): Updated descriptions about the 32.768 crystal and chip revisions
2024-12-09	v1.5	ESP32 Modules： Added download links to module reference designs
2024-11-15	v1.4	Schematic Checklist Section SPI: Newly added section
2024-10-15	v1.3	Schematic Checklist Section Ethernet MAC: Newly added section Section UART: Updated the AT related description
2024-01-09	v1.2	Schematic Checklist Section RF Tuning: Updated RF matching description
2023-12-25	v1.1	PCB Layout Design Section Crystal: Updated crystal PCB layout
2023-12-22	v1.0	Migrated ESP32 Hardware Design Guidelines from PDF to HTML format. During the migration from PDF to HTML format, minor updates, improvements, and clarifications were made throughout the documentation. If you would like to check previous versions of the document, please submit documentation feedback.