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3. Functional Description

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•

OFF: CHIP_PD pin is low. The RTC is disabled. All registers are cleared.

•

DEEP_SLEEP: Only RTC is powered on – the rest of the chip is powered off.

Recovery memory of RTC can keep basic Wi-Fi connecting information.

•

SLEEP: Only the RTC is operating. The crystal oscillator is disabled. Any wake-up

events (MAC, host, RTC timer, external interrupts) will put the chip into the WAKE-UP

state.

•

WAKE-UP: In this state, the system goes from the sleep states to the PWR state. The

crystal oscillator and PLLs are enabled.

•

ON state: the high speed clock is operational and sent to each block enabled by the

clock control register. Lower-level clock gating is implemented at the block level,

including the CPU, which can be gated off using the WAITI instruction, while the

system is on.

Off

On

Deep Sleep

Sleep

XTAL Off

WAKEUP

events

SLEEP criteria

XTAL_SETTLE

CHIP_PWD

Wakeup

~CHIP_PWD

Espressif

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9 17

2017.06