2 Schematic Checklist
5 4 3 2 1
D D
C C
The values of C1 and C2 vary with
the selection of the crystal.
The value of R1 varies with the actual
PCB board.
GPIO19
U0RXD
GPIO18
LNA_IN
GPIO0
GPIO1
SPICS0
SPID
SPIQ
SPICLK
SPIWP
RF_ANT
U0TXD
SPICS0 SPID
GND
VDD33
GNDGND GND
GND GND
VDD33
VDD_SPI
GND
GND
GND GND
C1
TBD
C9
TBD
R6 0
R1 0
ANT1
PCB_ANT
1
2
R5 0
C3
1uF
R2 499
R3 0
L1 2.0nH
C2
TBD
C8
TBD
C6
0.1uF
L2
TBD
C5
10uF
C4
10nF
C7
0.1uF
LNA_IN
1
VDD3P3
2
VDD3P3
3
XTAL_32K_P
4
20
SPICS0
21
SPICLK
22
SPID
23
SPIQ
24
U0RXD
27
U0TXD
28
XTAL_N
29
XTAL_P
30
GND
33
VDDA
32
VDDA
31
GPIO19
26
GPIO18
25
U1
40MHz(±10ppm)
XIN
1
GND
2
XOUT
3
GND
4
B B
A A
The values of C8, L2 and C9
vary with the actual PCB board.
If using ESP32-C3FN4 or ESP32-C3FH4,
external flash could be removed.
CHIP_EN
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
GPIO10
GPIO3
SPICLK
SPIHD SPIWP
SPIQ
XTAL_P
GND
GNDGND
GND GNDGND
VDD33
VDD_SPI
VDD33
GND
GND
VDD33
GND
VDD33
L3
TBD
U3 FLASH-3V3
C12
0.1uF
C10
0.1uF
R1 0
C1
10nF
Y1
40MHz(±10ppm)
VCC
4
NC
1
GND
2
OUT
3
R8
10K
C11
1uF
U2 ESP32-C3
CHIP_EN
7
MTMS
9
MTDI
10
VDD3P3_RTC
11
MTCK
12
MTDO
13
GPIO8
14
GPIO9
15
GPIO10
16
VDD3P3_CPU
17
VDD_SPI
18
SPIHD
Figure 3: ESP32C3 Family Analog Power Supply Pins
Notice:
• If you use a single power supply, the recommended voltage of the power supply for ESP32-C3 family
is 3.3 V, and its recommended output current is 500 mA or more.
• You are suggested to add an ESD protection diode at the power entrance.
2.2 Poweron Sequence and System Reset
2.2.1 Poweron Sequence
ESP32-C3 family uses a 3.3 V system power supply. The chip should be activated after the power rails have
stabilized. This is achieved by delaying the activation of pin 7 CHIP_EN after the 3.3 V rails have been brought
up.
Figure 4 shows the power-up and reset timing of ESP32-C3 family. Details about the parameters are listed in
Table 1.
Espressif Systems 7
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ESP32-C3 Family Hardware Design Guidelines V0.5
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