Data Sheet
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Espressif Systems
ESP8266 Datasheet
①: Modem-Sleep requires the CPU to be working, as in PWM or I2S applications. According to
802.11 standards (like U-APSD), it saves power to shut down the WiFi Modem circuit while
maintaining a WiFi connection with no data transmission. E.g. in DTIM3, to maintain a sleep 300ms-
wake 3ms cycle to receive AP’s Beacon packages, the current is about 15mA
②: During Light-Sleep, the CPU may be suspended in applications like WiFi switch. Without data
transmission, the WiFi Modem circuit can be turned off and CPU suspended to save power
according to the 802.11 standard (U-APSD). E.g. in DTIM3, to maintain a sleep 300ms-wake 3ms
cycle to receive AP’s Beacon packages, the current is about 0.9mA.
③: Deep-Sleep does not require WiFi connection to be maintained. For application with long time
lags between data transmission, e.g. a temperature sensor that checks the temperature every 100s,
sleep 300s and waking up to connect to the AP (taking about 0.3~1s), the overall average current is
less than 1mA.
2.4. Receiver Sensitivity
The following are measured under room temperature conditions with 3.3V and 1.1V power supplies.
Table 5 Receiver Sensitivity
Parameters
Min
Typical
Max
Unit
Input frequency
2412
2484
MHz
Input impedance
50
Ω
Input reflection
-10
dB
Output power of PA for 72.2Mbps
15.5
16.5
17.5
dBm
Output power of PA for 11b mode
19.5
20.5
21.5
dBm
Sensitivity
DSSS, 1Mbps
-98
dBm
CCK, 11Mbps
-91
dBm
6Mbps (1/2 BPSK)
-93
dBm
54Mbps (3/4 64-QAM)
-75
dBm
HT20, MCS7 (65Mbps, 72.2Mbps)
-72
dBm
Adjacent Channel Rejection
OFDM, 6Mbps
37
dB
OFDM, 54Mbps
21
dB
HT20, MCS0
37
dB
HT20, MCS7
20
dB
Espressif Systems / August 1, 2015
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