User's Manual

ESP-32S User Manual
Shenzhen Ai-Thinker Technology Co., Ltd http://www.ai-thinker.com
operates in low-power modes, the application chooses the external low-speed (32 kHz) crystal clock, rather
than the internal RC oscillators, to achieve the accurate wakeup time.
3.4 Power Consumption
With the advanced power management technology, ESP32-D0WDQ6 can switch between different power
modes as follows:
•
Power mode
- Active mode: chip radio is powered on. The chip can receive, transmit, or listen.
- Modem-sleep mode: the CPU is operational and the clock is configurable. Wi-Fi / Bluetooth
baseband and radio are disabled.
- Light-sleep mode: the CPU is paused. The RTC and ULP-coprocessor are running. Any wake-up
events (MAC, host, RTC timer, or external interrupts) will wake up the chip.
- Deep-sleep mode: Only RTC is powered on. Wi-Fi and Bluetooth connection data are stored in RTC
memory. The ULP-coprocessor can work.
- Hibernation mode: The internal 8MHz oscillator and ULP-coprocessor are disabled. The RTC
recovery memory is powered down. Only one RTC timer on the slow clock and some RTC GPIOs are
active. The RTC timer or the RTC GPIOs can wake up the chip from the Hibernation mode.
•
Sleep Pattern
- Association sleep pattern: The power mode switches between the active mode and
Modem-sleep/Light- sleep mode during this sleep pattern. The CPU, Wi-Fi, Bluetooth, and radio
wake up at pre-determined intervals to keep Wi-Fi / BT connections on.
- ULP sensor-monitored pattern: The main CPU is in the Deep-sleep mode. The ULP co-processor does
sensor measurements and wakes up the main system, based on the measured data from sensors.
The power consumption varies with different power modes/sleep patterns, and work status, of functional
modules (see Table 5).
Table 5: Power Consumption by Power Modes
Power mode
Comment
Power consumption
Active mode (RF working)
Wi-Fi Tx packet 13 dBm ~ 21 dBm
160
〜
260 mA
Wi-Fi / BT Tx packet 0 dBm
120mA
Wi-Fi / BT Rx and listening
80 〜90 mA
Association sleep pattern (by Light-
0.9 mA@DTIM3, 1.2 mA@DTIM1
Modem-sleep mode
The CPU is powered on.
Max speed: 20 mA
Normal: 5 〜10 mA
Slow speed: 3 mA
Light-sleep mode
-
0.8 mA
Deep-sleep mode
The ULP-coprocessor is powered on.
0.15 mA
ULP sensor-monitored pattern
25 µA@1% duty
RTC timer + RTC memories
20 µA
Hibernation mode
RTC timer only
5µA