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ESP32 Datasheet(PDF) 16 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

Part # ESP32
Description  32-bit MCU & 2.4 GHz Wi-Fi & BT/BLE SoCs
PDF  60 Pages
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Manufacturer  ESPRESSIF [ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.]
Direct Link  https://www.espressif.com/
Logo ESPRESSIF - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

ESP32 Datasheet(HTML) 16 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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2. Pin Definitions
2.3 Power Scheme
ESP32’s digital pins are divided into three different power domains:
• VDD3P3_RTC
• VDD3P3_CPU
• VDD_SDIO
VDD3P3_RTC is also the input power supply for RTC and CPU.
VDD3P3_CPU is also the input power supply for CPU.
VDD_SDIO connects to the output of an internal LDO whose input is VDD3P3_RTC. When VDD_SDIO is connected
to the same PCB net together with VDD3P3_RTC, the internal LDO is disabled automatically. The power scheme
diagram is shown below:
SDIO
Domain
RTC
Domain
CPU
Domain
LDO
LDO
LDO
1.8 V
1.1 V
1.1 V
VDD3P3_RTC
VDD3P3_CPU
VDD_SDIO
3.3 V/1.8 V
Figure 4: ESP32 Power Scheme
The internal LDO can be configured as having 1.8 V, or the same voltage as VDD3P3_RTC. It can be powered off
via software to minimize the current of flash/SRAM during the Deep-sleep mode.
Notes on CHIP_PU:
• The illustration below shows the ESP32 power-up and reset timing. Details about the parameters are listed
in Table 2.
VDD
CHIP_PU
t0
t1
V
IL_nRST
Figure 5: ESP32 Power-up and Reset Timing
Espressif Systems
9
ESP32 Datasheet V3.0



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