Espressif Systems ESP32-S3 - Power Supply; Digital Power Supply; Analog Power Supply

Chapter 3. Schematic Checklist
• GPIO
• ADC
• SDIO
• USB
• Touch sensor
The rest of this chapter details the speci󰝘cs of circuit design for each of these sections.
3.1 Power Supply
The general recommendations for power supply design are:
• When using a single power supply, the recommended power supply voltage is 3.3 V and the output current is
no less than 500 mA.
• It is suggested to add an ESD protection diode at the power entrance.
More information about power supply pins can be found in ESP32-S3 Series Datasheet > Section Power Supply.
3.1.1 Digital Power Supply
ESP32-S3 has pin46 VDD3P3_CPU as the digital power supply pin(s) working in a voltage range of 3.0 V ~ 3.6 V.
It is recommended to add an extra 0.1 μF decoupling capacitor close to the pin(s).
Pin VDD_SPI can serve as the power supply for the external device at either 1.8 V or 3.3 V (default). It is recom-
mended to add extra 0.1 μF and 1 μF decoupling capacitors close to VDD_SPI.
• When VDD_SPI operates at 1.8 V, it is powered by ESP32-S3’s internal LDO. The typical current this LDO
can o󰝗er is 40 mA.
• When VDD_SPI operates at 3.3 V, it is driven directly by VDD3P3_RTC through a 14 Ω resistor, therefore,
there will be some voltage drop from VDD3P3_RTC.
Attention: When using VDD_SPI as the power supply pin for in-package or o󰝗-package 3.3 V 󰝙ash/PSRAM,
the supply voltage should be 3.0 V or above, so as to meet the requirements of 󰝙ash/PSRAM’s working voltage.
Depending on the value of EFUSE_VDD_SPI_FORCE, the VDD_SPI voltage can be controlled in two ways, as
Table VDD_SPI Voltage Control shows.
Table 1: VDD_SPI Voltage Control
EFUSE_VDD_SPI_FORCEGPIO45 EFUSE_VDD_SPI_FORCEVolt-
age
VDD_SPI Power Source
0 0 Ignored 3.3 V VDD3P3_RTC via R
SPI
(de-
fault)
0 1 Ignored 1.8 V Flash Voltage Regulator
1 Ignored 0 1.8 V Flash Voltage Regulator
1 Ignored 1 3.3 V VDD3P3_RTC via R
SPI
VDD_SPI can also be driven by an external power supply.
The schematic for the digital power supply pins is shown in Figure ESP32-S3 Schematic for Digital Power Supply Pins.
3.1.2 Analog Power Supply
ESP32-S3’s VDDA and VDD3P3 pins are the analog power supply pins, working at 3.0 V ~ 3.6 V.
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