Data Sheet

18 | P a g e Espressif Systems Oct 12, 2013
ESP8266 802.11bgn Smart Device
10 Power Management
The chip can be put into the following states:
 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 wakeup
events (MAC, host, RTC timer, external
interrupts) will put the chip into the
WAKEUP state.
 WAKEUP: 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