Turning off the Wi-Fi Modem will significantly reduce the power consumption and as the CPU is still operational, the Modem–Sleep Mode can be used in applications where only the CPU must be working (like ADC, PWM or I2S). This means that there is no data transmission but only the connection. As the name suggests, in Modem–Sleep mode, the CPU of ESP8266 SoC is operational but the Wi-Fi and Radio are disabled.Įven though the Wi-Fi Modem circuit is powered down, the chip still maintains the Wi-Fi connection. This is the first and simplest low power mode or sleep mode of ESP8266 SoC. NOTE: The power consumption values are just for the RF Module without any additional CPU operations (like GPIO, ADC etc.). The supply voltage is 3.0V and the ambient temperature is 25 0C.Ĩ02.11b – CCK – 11 Mbps – P OUT = +17 dBmĨ02.11g – OFDM – 54 Mbps – P OUT = +15 dBm The following table gives the typical power consumption values for various parameters in Active Mode. Additionally, the power consumption also depends on the type of IEE 802.11 protocol (like 802.11b, 802.11g or 802.11n) and its associated modulation (CCK, OFDM or MCS7). Power Consumption in Active Mode is dependent on whether the SoC is transmitting data over Wi-Fi or receiving data. As the CPU is functioning, all the peripherals are also active and can be used by the application. This is the default mode of operation, where the CPU is running normally and also the Wi-Fi and Radio are powered ON so that the SoC can transmit, receive or listen to Wi-Fi. With its advanced power management technology, the ESP8266EX Wi-Fi SoC supports four different operating modes. Apart from the normal microcontroller stuff (like GPIO, SPI, ADC, I2C etc.), the ESP8266 SoC also has integrated Wi-Fi networking capabilities.Įven with all the integrated Wi-Fi hardware like RF Balun, Low-Noise Receive Amplifier, Power Amplifier, Filters and Antenna Switches, the ESP8266 Wi-Fi SoC provides several low power operations to build an energy efficient system. Things get more interesting when you are working with wireless related design, for example, a system based on ESP8266 Wi-Fi SoC. This is important, especially if you are designing a Lithium Battery operated system and you want your system to run on battery for a long time. In low power mode, a microcontroller shuts down parts of its system which are not being used by the application. One of the major factors in selecting an MCU for your product design is its ability to operate in low power mode, a special power management feature of modern Microcontrollers. This is actually a key characteristic of small processors (like MCUs and SoCs) which are usually implemented in battery powered systems. Modern Microcontrollers and System on Chips (SoCs) are designed with good power efficiency.
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