Power Supply; Digital Power Supply; Analog Power Supply - Espressif Systems ESP32-C6 Series Hardware Design Manuallines

2 Schematic Checklist

2.1 Power Supply

For more information about power pins, please refer to

2.1.1 Digital Power Supply

ESP32-C6 has pin5 VDDPST1 and pin28 VDDPST2 that supply power to LP digital pins/part of analog pins and
HP digital pins respectively, in a voltage range of 3.0 V
close to each digital power supply pin.
Pin23 VDD_SPI can serve as the power supply for the external device at 3.3 V (typical value), provided by
VDDPST2 via R
5
Scheme). Therefore, there will be a voltage drop on VDD_SPI to VDDPST2. It is recommended to add a 0.1 µF
and a 1 µF filter capacitor close to VDD_SPI.
VDD_SPI can be connected to and powered by an external power supply.
The values of C1 and C4 vary with
When not serving as a power supply pin, VDD_SPI can be used as GPIO27.
the selection of the crystal.
The value of R4 varies with the actual
PCB board. The initial value could be
Notice:
24 nH.
When using VDD_SPI as the power supply pin for the in-package flash or external 3.3 V flash, the supply voltage should
be 3.0 V or above, so as to meet the requirements of flash's working voltage.
C3
1uF
The schematic for the digital power supply pins is shown in Figure 3.
GND
L1 2.0nH
C7 C8
1uF 0.1uF
GND GND
1 RF_ANT
L2 TBD
2
C11
TBD TBD
GND GND

2.1.2 Analog Power Supply

Pin2 VDDA3P3, pin3 VDDA3P3, pin37 VDDA1, and pin40 VDDA2 are the analog power supply pins, working at
3.0 V ~ 3.6 V.
Please be noted that the sudden increase in current draw, when ESP32-C6 is transmitting signals, may cause a
power rail collapse. Therefore, it is highly recommended to add a 10 µF capacitor to the power pin2 and pin3
5
VDDA3P3, which can work in conjunction with the 1 µF capacitor. In addition, a CLC filter circuit needs to be
Espressif Systems
(For information about R
SP I
4
C2
10nF
GND
GND
C9
0.1uF
GND
LNA_IN 1
ANT
2
VDDA3P3
3
C12
VDDA3P3
CHIP_EN
4
CHIP_EN
5
VDDPST1
GPIO0 6
XTAL_32K_P
GPIO1 7
XTAL_32K_N
GPIO2 8
GND
GPIO2
GPIO3 9
GPIO3
GPIO4 10
MTMS
VDD33
C15 U1
0.1uF
GND
Figure 3: Schematic for the Digital Power Supply Pins
4
ESP32-C6 Series Datasheet
~ 3.6 V. It is recommended to add a 0.1 µF filter capacitor
, please refer to ESP32-C6 Series Datasheet
SP I
3
GND
GND GND
Y1
C1 C4
TBD TBD
GND
40MHz(±10ppm)
R17 0
30
U0RXD
29
U0TXD
28
VDDPST2
27
GPIO15
26
SPID
25
SPICLK
24
SPIHD
23
VDD_SPI
22
SPIWP
21
SPIQ
ESP32-C6
3
8
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2
GPIO23
GPIO22
GPIO21
GPIO20
GPIO19
GPIO18
GND
C10
VDD33
0.1uF
U0RXD
R3 499 U0TXD
GPIO15
R16 0 SPID
SPICLK
R15 0
R14 0 SPIHD
R13 0 SPIWP
R10 0 SPIQ
C16 C17
VDD_SPI
0.1uF 1uF
GND GND
2
ESP32-C6 Series Hardware Design Guidelines v1.0
Power Supply.
Power
VDD_SPI
R8
10K(NC)
SPICS0 1
/CS
SPICLK 6
CLK
SPIHD 7
/HOLD
U2 FLASH
GND
5
DI
2
DO
3
/WP
NC: No