Espressif Systems ESP Faq page 187

Chapter 6. Test verification
6.1.3 Can ESP32 in Deep-sleep mode be woken up by any RTC_GPIO?
Yes. For the configuration of RTC_GPIO, please refer to
Section Pin Description.
6.1.4 What is the power consumption of ESP8266 when the CHIP_PU pin is at the low
level?
• CHIP_PU pin is the module EN pin. When the pin is set to the low level, the power consumption of the chip
is about 0.5 μA.
• In Table Power Consumption by Power Modes of
agement> Table 3-4. Power Consumption by Power Modes, shut down power mode means CHIP_PU is pulled
down and the chip is disabled.
6.1.5 Why does the minimum current of ESP32 in Light-sleep increase when the timer is
not used as a wakeup source?
• By default, to avoid potential issues,
prevent errors that may be caused if the flash is not fully powered off and back on when the device has just
gone to sleep and is immediately woken up.
• For the issue details and on how to optimize power consumption in this scenario please refer to
of Flash in the ESP-IDF Programming Guide.
6.1.6 In ESP32's Deep-sleep mode, using an internal 150 KHz RTC clock or using an
external 32 KHz, which consumes more power?
• If the RTC clock source is external 32 kHz crystal, there is no difference in power consumption.
• If an external 32 kHz oscillator is connected to the hardware, the power consumption will increase by 50 to
100 μA regardless of which RTC clock source is selected.
6.1.7 What are the requirements for CPU frequency to ensure normal operation of the
RF module when reducing power consumption by reducing the CPU frequency?
CPU frequency should be 80 Mhz at least.
Espressif Systems
ESP32 datasheet
ESP8266 Datasheet
esp_light_sleep_start functions will not power down flash. This is to
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