ESP8684 datasheet(32/60 Pages) ESPRESSIF

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4 Functional Description

• Three comparators generating three independent interrupts based on configured alarm value or alarm

period

• Software configuring the reference count value. For example, the system timer is able to load back the

sleep time recorded by RTC timer via software after Light-sleep

• Able to stall or continue running when CPU stalls or enters on-chip-debugging mode

For details, see ESP8684 Technical Reference Manual > Chapter System Timer.

4.1.3.6 Power Management Unit

The ESP8684 has an advanced Power Management Unit (PMU). It can be flexibly configured to power up

different power domains of the chip to achieve the best balance between chip performance, power

consumption, and wakeup latency.

The integrated Ultra-Low-Power (ULP) coprocessors allow the ESP8684 to operate in Deep-sleep mode with

most of the power domains turned off, thus achieving extremely low-power consumption.

Configuring the PMU is a complex procedure. To simplify power management for typical scenarios, there are

the following predefined power modes that power up different combinations of power domains:

• Active mode: CPU and chip radio are powered on. The chip can receive, transmit, or listen.

• Modem-sleep mode: The CPU is operational and the clock speed can be reduced. Wireless base band,

and radio are disabled, but wireless connection can remain active.

• Light-sleep mode: The CPU is paused. Any wake-up events (MAC,RTC timer, or external interrupts) will

wake up the chip. Wireless connection can remain active.

• Deep-sleep mode: CPU and most peripherals are powered down. Only the PMU in RTC power

management unit is powered on. For more details, please refer to Figure 1.

ESP8684 has four power modes, which are predefined configurations that power up different combinations of

power domains. For details, please refer to Table 14.

Table 14: Predefined Power Modes

Power Domain

Power Mode

PMU

Digital

RC_FAST_CLK

XTAL_CLK

PLL_CLK

RF Circuits

Active

Modem-sleep

OFF

Light-sleep

OFF

Deep-sleep

OFF

4.1.3.7 Brownout Detector

ESP8684 can periodically monitor the voltage of the power supply, and in the event of abnormal voltage, it is

capable of generating interrupts or initiating resets.

Feature List

• Configurable detection threshold

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ESP8684 Series Datasheet v2.0

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