Espressif ESP32 Technical Reference Manual page 698

31 Low-Power Management (RTC_CNTL)
– The digital core is powered down. The CPU context is lost.
– The supply voltage to the RTC core drops to 0.7V.
– 8 x 32 bits of data are kept in general-purpose retention registers.
– The RTC memory and fast RTC memory can be retained.
– Current consumption: ∼ 6.5 µA.
– Wake-up latency: less than 1 ms.
– Recommended for ultra-low-power infrequently-connected Wi-Fi/Bluetooth applications.
• Hibernatation mode
– The internal 8 MHz oscillator, 40 MHz high-speed crystal, PLL, and radio are disabled.
– The digital core is powered down. The CPU context is lost.
– The RTC peripheral domain is powered down.
– The supply voltage to the RTC core drops to 0.7V.
– 8 x 32 bits of data are kept in general-purpose retention registers.
– The RTC memory and fast RTC memory are powered down.
– Current consumption: ∼ 4.5 µA.
– Wake-up source: RTC timer only.
– Wake-up latency: less than 1 ms.
– Recommended for ultra-low-power infrequently-connected Wi-Fi/Bluetooth applications.
Espressif Systems
Figure 31-10. Power Modes
698
Submit Documentation Feedback
ESP32 TRM (Version 5.2)