Espressif Systems ESP Faq page 174

Chapter 5. Hardware related
5.3.9 For ESP32-S2 chips, can I have audio connection when the DVP camera interface
is in use?
The LCD, DVP camera, and I2S interfaces of ESP32-S2 share one set of hardware, so they cannot be
used at the same time.
5.3.10 What should be noted when I assign I2C signals to GPIO0 and GPIO4 of ESP32
modules?
Please pull GPIO0 up when assigning I2C signals to the pin. Please also ensure GPIO0 can be pulled
down when powered on during flashing, which can be released afterwards. Only pull GPIO0 down when
flashing firmware on ESP32 modules.
5.3.11 When the external flash is connected to GPIO6 ~ GPIO11, can they be set as SPI
pins?
When the external flash is connected to GPIO6 ~ GPIO11, they cannot be set as SPI pins.
5.3.12 Do I need to connect an external crystal when using the ESP8285 chip?
You need to connect an external crystal, as the chip has no internal crystal.
5.3.13 Where can I find the reference design for connecting an external PSRAM to
ESP32-D2WD?
You may refer to the design for the external PSRAM of ESP32-PICO-D4. Please refer to Chapter
Peripheral Schematics in the
Note: ESP32-D2WD has an 1.8 V flash, so please add a resistor and a capacitor to VDD_SDIO and
connect an 1.8 V PSRAM.
5.3.14 Can I use ESP32 to play music with PWM or DAC?
You may use ESP32 to play music with PWM or DAC, and we recommend you play voice prompts. To
run a test, please refer to esp-adf/examples/player/pipeline_play_mp3_with_dac_or_pwm.
Espressif Systems
ESP32-PICO-D4 Datasheet.
157
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