Espressif ESP32­-S3 Series User Manual

CONFIDENTIAL
2 Schematic Checklist
2.3 Flash and SRAM
ESP32-S3 requires SiP flash or external flash to store application firmware and data. SiP PSRAM or external
RAM is optional.
2.3.1 SiP Flash and SiP PSRAM
SiP flash and SiP PSRAM refer to the flash and PSRAM that can be integrated into the package, depending on a
chip variant. For the pin-to-pin mapping between the chip and SiP flash/PSRAM, please refer to Table 2. The
chip pins listed here are not recommended for other usage.
Table 2: PintoPin Mapping Between Chip and SiP Flash/PSRAM
ESP32S3FN8 SiP flash (8 MB, Quad SPI)
SPICLK CLK
SPICS0 CS#
SPID DI
SPIQ DO
SPIWP WP#
SPIHD HOLD#
ESP32S3R2 SiP PSRAM (2 MB, Quad SPI)
SPICLK CLK
SPICS1 CE#
SPID SI/SIO0
SPIQ SO/SIO1
SPIWP SIO2
SPIHD SIO3
ESP32S3R8 / ESP32S3R8V SiP PSRAM (8 MB, Octal SPI)
SPICLK CLK
SPICS1 CE#
SPID DQ0
SPIQ DQ1
SPIWP DQ2
SPIHD DQ3
GPIO33 DQ4
GPIO34 DQ5
GPIO35 DQ6
GPIO36 DQ7
GPIO37 DQS/DM
2.3.2 External Flash and External RAM
ESP32-S3 supports up to 1 GB external flash and 1 GB external RAM. Make sure to select appropriate external
flash and RAM according to the power voltage on VDD_SPI. It is recommended to add a zero-ohm series resistor
on the SPI communication lines, as Figure 5 shows, to lower the driving current, reduce interference to RF, adjust
timing, and better shield from interference.
The schematic for the external flash and RAM is shown in Figure 5.
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ESP32-S3 Series Hardware Design Guidelines v1.0

Espressif ESP32­-S3 Series Specifications

General

Brand	Espressif
Model	ESP32­-S3 Series
Category	Microcontrollers
Language	English