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13 Migration Guide

This section provides an overview of the software and hardware changes when migrating from the existing

module design based on an older ESP32-PICO variant to the new design based on a newer ESP32-PICO

variant.

13.1 Migrating from ESP32-PICO-D4 to ESP32-PICO-V3

ESP32-PICO-D4 is the first introduced ESP32-PICO variant with ESP32 chip revision v1.0 or v1.1.

ESP32-PICO-V3 contains a newer ESP32 chip inside (v3.0 or v3.1). For information about possible hardware

and software changes in ESP32 chip revision v3.0, refer to ESP32 Chip Revision v3.0 User Guide .

ESP32-PICO-D4 and ESP32-PICO-V3 are not 1:1 pin-compatible. For changes in pin layout and functions, refer

to Section 2.4 Pin Compatibility Between ESP32-PICO Variants.

Both ESP32-PICO-D4 and ESP32-PICO-V3 are produced with in-package flash. ESP32-PICO-D4 can connect

to external PSRAM. However, ESP32-PICO-V3 cannot connect to external PSRAM.

EMC compliance and RF performance tests should be repeated after a design is updated to use

ESP32-PICO-V3.

13.2 Migrating from ESP32-PICO-V3 to ESP32-PICO-V3-02

ESP32-PICO-V3-02 is a memory upgrade of ESP32-PICO-V3. ESP32-PICO-V3-02 has both in-package flash

and PSRAM, while ESP32-PICO-V3 has only flash. It is not possible for both variants to connect to external

PSRAM.

ESP32-PICO-V3-02 is designed to be largely pin-compatible with ESP32-PICO-V3, and thus requires only

minor changes during migration. For changes in pin layout and functions, refer to Section 2.4 Pin Compatibility

Between ESP32-PICO Variants.

EMC compliance and RF performance tests should be repeated after a design is updated to use

ESP32-PICO-V3-02.

13.3 Summary

As summarized in this migration guide, there are minimal or no hardware and software changes required when

migrating to newer ESP32-PICO variants. If you have any problems with migration, please contact Espressif

Technical Support.

Espressif Systems

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ESP32-PICO Series Datasheet v1.1

ESP32-PICO Datasheet(PDF) 61 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.