Data Sheet

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3. Functional Description
Table 3-4. Power Consumption by Power Modes
Power Mode
Description
Power Consumption
Active (RF working)
Wi-Fi TX packet
Please refer to Table 5-2.
Wi-Fi RX packet
Modem-sleep
①
CPU is working
15 mA
Light-sleep
②
-
0.9 mA
Deep-sleep
③
Only RTC is working
20 uA
Shut down
-
0.5 uA
📖 Notes:
① Modem-sleep mode is used in the applications that require the CPU to be working, as in PWM or
I2S applications. According to 802.11 standards (like U-APSD), it shuts down the Wi-Fi Modem
circuit while maintaining a Wi-Fi connection with no data transmission to optimize power
consumption. E.g., in DTIM3, maintaining a sleep of 300 ms with a wakeup of 3 ms cycle to receive
AP’s Beacon packages at interval requires about 15 mA current.
② During Light-sleep mode, the CPU may be suspended in applications like Wi-Fi switch. Without
data transmission, the Wi-Fi Modem circuit can be turned off and CPU suspended to save power
consumption according to the 802.11 standards (U-APSD). E.g. in DTIM3, maintaining a sleep of
300 ms with a wakeup of 3ms to receive AP’s Beacon packages at interval requires about 0.9 mA
current.
③ During Deep-sleep mode, Wi-Fi is turned off. For applications with long time lags between data
transmission, e.g. a temperature sensor that detects the temperature every 100 s, sleeps for 300 s
and wakes up to connect to the AP (taking about 0.3 ~ 1 s), the overall average current is less than 1
mA. The current of 20 μA is acquired at the voltage of 2.5 V.
Espressif
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2020.10