Power-Up Timing And System Reset; Power-Up Timing; System Reset; Schematic For The Analog Power Supply Pins - Espressif Systems ESP32-C6 Series Hardware Design Manuallines

2 Schematic Checklist
added near VDDA3P3 pins so as to suppress high-frequency harmonics. The recommended rated current of the
D
inductor is 500 mA or above. Refer to Figure
power pin.
VDD33
VDD33
C
C6
10uF
GND
ANT1
1
2
PCB_ANT
Notice:
The values of C11, L2 and C12
B
vary with the actual PCB board.
• The recommended power supply voltage for ESP32-C6 is 3.3 V and the output current is no less than 500 mA.
• It is suggested to add another 10 µF capacitor at the power entrance. If the power entrance is close to pin2 and
CHIP_EN:
pin3, two 10 µF capacitors could be merged into one.
H Activate chip;
L Disable chip.
• It is suggested to add an ESD protection diode at the power entrance.
This pin could not be float.

2.2 Power-up Timing and System Reset

2.2.1 Power-up Timing

A
When ESP32-C6 uses a 3.3 V system power supply, the power rails need some time to stabilize before CHIP_PU
is pulled up and the chip is activated. Therefore, CHIP_PU needs to be powered up after the 3.3 V rails have
been brought up. More details about the power-up timing can be found in Section 2.2.3.
Notice:
5
To ensure the correct power-up timing, it is advised to add an RC delay circuit at the CHIP_PU pin. The recommended
setting for the RC delay circuit is usually R = 10 kΩ and C = 1 µF. However, specific parameters should be adjusted based
on the characteristics of the actual power supply and the power-up and reset sequence timing of the chip.

2.2.2 System Reset

CHIP_PU serves as the reset pin of ESP32-C6. The reset voltage (V
0.25 × VDDPST1) V. To avoid reboots caused by external interferences, make the CHIP_PU trace as short as
possible. Also, add a pull-up resistor as well as a capacitor to the ground whenever possible. More details can
be found in Section 2.2.3.
Espressif Systems
The values of C1 and C4 vary with
the selection of the crystal.
4 and place the appropriate decoupling capacitor near each analog
The value of R4 varies with the
actual PCB board. R4 could be a
resistor or inductor, the initial
value is suggested to be 24 nH.
C3
1uF
GND
L1
C7 C8
1uF 0.1uF
GND GND
RF_ANT L2
C11
TBD
Figure 4: Schematic for the Analog Power Supply Pins
GND GND
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C2
10nF
GND
2.0nH
GND
C9
0.1uF
GND
TBD LNA_IN 1
2
3
C12
CHIP_EN
4
TBD 5
GPIO0 6
GPIO1 7
GPIO2 8
GND
GPIO3 9
GPIO4 10
VDD33
C15
0.1uF
GND
4
) should be in the range of (–0.3
IL_nRST
9
ESP32-C6 Series Hardware Design Guidelines v1.0
GND
GND
Y1
C1
TBD
GND
40MHz(±10ppm)
ANT
VDDA3P3
VDDA3P3
CHIP_EN
VDDPST1
XTAL_32K_P
XTAL_32K_N
GPIO2
GPIO3
MTMS
U1
GND
C4
TBD
R17 0
GND
C10
0.1uF
30
U0RXD
29 R3
U0TXD
28
VDDPST2
27
GPIO15
26 R16
SPID
25
R15
SPICLK
24 R14
SPIHD
23
VDD_SPI
22 R13
SPIWP
21
R10
SPIQ
C16
0.1uF
ESP32-C6
GND
3
~