Schematic Checklist - Espressif ESP32­-S3 Series Hardware Design Manuallines

2 Schematic Checklist

2 Schematic Checklist
The integrated circuitry of ESP32-S3 requires only 20 electrical components (resistors, capacitors, and
inductors), one crystal and one SPI flash memory chip. The high integration of ESP32-S3 allows for simple
peripheral circuit design. This chapter details ESP32-S3 schematics.
ESP32-S3 schematic is shown in Figure 1.
5
D
The values of C1 and C4 vary with
the selection of the crystal.
The value of R4 varies with the actual
VDD33 PCB board.
C3
1uF
VDD33
GND
L1
C
C6 C7 C8
10uF 1uF 0.1uF
GND GND GND
ANT1
RF_ANT
1 L2
2
L3 C11
PCB_ANT
TBD TBD
GND GND
C5
TBD
B
GND
The values of C11, L2 and C12
vary with the actual PCB board.
NC: No component.
A
5
Notice:
Figure 1 shows the connection for quad SPI flash/PSRAM. In cases when external octal SPI flash/PSRAM is used, or
when octal SiP PSRAM is used in ESP32-S3R8 and ESP32-S3R8V, GPIO33
for other functions.
Any basic ESP32-S3 circuit design may be broken down into 10 major sections:
• Power supply
• Power-on sequence and system reset
• Flash and SRAM
• Crystal oscillator
• RF
Espressif Systems
4
GND
C1
TBD
C2
10nF
GND
GND
0
C9
TBD
GND
LNA_IN
TBD 1
LNA_IN
2
VDD3P3
3
C12
VDD3P3
CHIP_PU
4
CHIP_PU
TBD GPIO0 5
GPIO0
GPIO1 6
GPIO1
7
GPIO2
GPIO2
GND GPIO3 8
GPIO3
GPIO4 9
GPIO4
GPIO5 10
GPIO5
GPIO6 11
GPIO6
GPIO7 12
GPIO7
GPIO8 13
GPIO8
GPIO9 14
GPIO9
U1
VDD33
C15
0.1uF
GND
Figure 1: ESP32­S3 Schematic
4
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3
GND
GND
Y1
C4
TBD
VDD33
R1
10K(NC)
GND
40MHz(±10ppm)
R3
C10
0.1uF
GND
42
GPIO37
41
GPIO36
40
GPIO35
39
GPIO34
38
GPIO33
37
SPICLK_P
36
SPICLK_N
35 R16
SPID
34 R15
SPIQ
33 R10
SPICLK
32
SPICS0
31
R14
SPIWP
30 R13
SPIHD
29
VDD_SPI
C13
0.1uF
ESP32-S3
GND
3
~ GPIO37 are occupied and cannot be used
• UART
• ADC
• USB
• Touch Sensor
• Strapping pins
6
ESP32-S3 Series Hardware Design Guidelines v1.0
2
GPIO46
GPIO45
U0RXD
U0TXD
499
GPIO42
GPIO41
GPIO40
GPIO39
GPIO38
VDD33
VDD_SPI
GPIO37
GPIO36
GPIO35
GPIO34 SPICS0 1
/CS
GPIO33
GPIO47 SPICLK 6
CLK
GPIO48
0 SPID SPIHD 7
/HOLD
0 SPIQ
0 SPICLK
SPICS0 U2
SPIWP
0
0 SPIHD
GND
VDD_SPI
C14 VDD_SPI
1uF
SPICS1 1
CS
GND
SPICLK 6
SCLK
7
SPIHD
SIO3
U3
GND
2
1
5 SPID
DI
2 SPIQ
DO
3 SPIWP
/WP
FLASH-3V3
5 SPID
SI/SIO0
2 SPIQ
SO/SIO1
3
SPIWP
SIO2
(Optional)
PSRAM-3V3
1