ESP32 datasheet(28/60 Pages) ESPRESSIF

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3. Functional Description

– Asynchronous data reception and transmission

– Adaptive Frequency Hopping and Channel assessment

– Connection parameter update

– Data Length Extension

– Link Layer Encryption

– LE Ping

3.7 RTC and Low-Power Management

With the use of advanced power-management technologies, ESP32 can switch between different power modes.

• Power modes

– Active mode: The chip radio is powered on. The chip can receive, transmit, or listen.

– Modem-sleep mode: The CPU is operational and the clock is configurable. The Wi-Fi/Bluetooth base-

band and radio are disabled.

– Light-sleep mode: The CPU is paused. The RTC memory and RTC peripherals, as well as the ULP

co-processor are running. Any wake-up events (MAC, host, RTC timer, or external interrupts) will wake

up the chip.

– Deep-sleep mode: Only the RTC memory and RTC peripherals are powered on. Wi-Fi and Bluetooth

connection data are stored in the RTC memory. The ULP co-processor is functional.

– Hibernation mode: The internal 8-MHz oscillator and ULP co-processor are disabled. The RTC recovery

memory is powered down. Only one RTC timer on the slow clock and certain RTC GPIOs are active.

The RTC timer or the RTC GPIOs can wake up the chip from the Hibernation mode.

Table 6: Power Consumption by Power Modes

Power mode

Description

Power consumption

Active (RF working)

Wi-Fi Tx packet

Please refer to

Table 15 for details.

Wi-Fi/BT Tx packet

Wi-Fi/BT Rx and listening

Modem-sleep

The CPU is

powered on.

240 MHz

Dual-core chip(s)

30 mA

~ 68 mA

Single-core chip(s)

N/A

160 MHz

Dual-core chip(s)

27 mA

~ 44 mA

Single-core chip(s)

27 mA

~ 34 mA

Normal speed: 80 MHz

Dual-core chip(s)

20 mA

~ 31 mA

Single-core chip(s)

20 mA

~ 25 mA

Light-sleep

0.8 mA

Deep-sleep

The ULP co-processor is powered on.

150 µA

ULP sensor-monitored pattern

100 µA @1% duty

RTC timer + RTC memory

10 µA

Hibernation

RTC timer only

5 µA

Power off

CHIP_PU is set to low level, the chip is powered off.

0.1 µA

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ESP32 Datasheet V3.0

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