User's Manual

5. Power Consumption

Table 11 Power Consumption

Parameters Min Typical Max Unit

Tx802.11b, CCK 11Mbps, P OUT=+17dBm

170

Tx 802.11g, OFDM 54Mbps, P OUT =+15dBm

140

Tx 802.11n, MCS7, P OUT =+13dBm

120

Rx 802.11b, 1024 bytes packet length , -80dBm

Rx 802.11g, 1024 bytes packet length, -70dBm

Rx 802.11n, 1024 bytes packet length, -65dBm

Modem-Sleep①

Light-Sleep②

0.9

Deep-Sleep③

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 Wi-Fi Modem circuit while maintaining a Wi-Fi

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 Wi-Fi switch. Without data

transmission, the Wi-Fi 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 Wi-Fi 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.