Flash And Sram; Sip Flash And Sip Psram; External Flash And External Ram - Espressif ESP32­-S3 Series Hardware Design Manuallines

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: Pin­to­Pin Mapping Between Chip and SiP Flash/PSRAM
ESP32­S3FN8
SPICLK
SPICS0
SPID
SPIQ
SPIWP
SPIHD
ESP32­S3R2
SPICLK
SPICS1
SPID
SPIQ
SPIWP
SPIHD
ESP32­S3R8 / ESP32­S3R8V
SPICLK
SPICS1
SPID
SPIQ
SPIWP
SPIHD
GPIO33
GPIO34
GPIO35
GPIO36
GPIO37

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
timing, and better shield from interference.
The schematic for the external flash and RAM is shown in Figure 5.
Espressif Systems
SiP flash (8 MB, Quad SPI)
SiP PSRAM (2 MB, Quad SPI)
SiP PSRAM (8 MB, Octal SPI)
5 shows, to lower the driving current, reduce interference to RF, adjust
10
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CLK
CS#
DI
DO
WP#
HOLD#
CLK
CE#
SI/SIO0
SO/SIO1
SIO2
SIO3
CLK
CE#
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQS/DM
ESP32-S3 Series Hardware Design Guidelines v1.0