Hardware Design Guidelines - Espressif
document uses a 4 MB flash by default (a SOP8 package, U3 on Figure 4). The VDD_SDIO acts as the power supply pin. Make sure to select the appropriate flash according to the power voltage on VDD_SDIO. Note: • Some ESP32 chip variants (e.g. ESP32-U4WDH and ESP32-PICO) have flash already embedded in the chip
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