Power-On Sequence And System Reset; Power-On Sequence - Espressif Systems ESP32-C3FH4 Hardware Design Manuallines

2 Schematic Checklist
VDD33
VDD33
C5
C
10uF
GND
ANT1
PCB_ANT
The values of C8, L2 and C9
vary with the actual PCB board.
Notice:
B
• 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.
A
Figure 4 shows the power-up and reset timing of ESP32-C3 family. Details about the parameters are listed in
Table 1.
Espressif Systems
The values of C1 and C2 vary with
the selection of the crystal.
The value of R1 varies with the actual
PCB board.
C3
1uF
GND
L1 2.0nH
C6
0.1uF
GND
TBD
1 RF_ANT
L2
2
C8 C9
TBD TBD
GND GND
Figure 3: ESP32­C3 Family Analog Power Supply Pins
VDD33
5
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C4
10nF
GND
GND
C7
0.1uF
GND
LNA_IN 1
2
3
GPIO0 4
GPIO1 5
6 6
GPIO2 GPIO2
CHIP_EN
7
GND
GPIO3 8
R8
10K
VDD33
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
GPIO10
R1 0
C1
10nF
GND
7
ESP32-C3 Family Hardware Design Guidelines V1.0
TBD
LNA_IN
VDD3P3
VDD3P3
XTAL_32K_P
XTAL_32K_N XTAL_32K_N
GPIO2
CHIP_EN
GPIO3
U2
Y1
4 3
VCC OUT
1 2
NC GND
40MHz(±10ppm)
4
TBD
GND
40MHz(±10ppm)
SPIQ
SPID
SPICLK
SPICS0
SPIWP SPIWP
SPIHD
VDD_SPI
VDD3P3_CPU
ESP32-C3
TBD
L3
GND