1.Technology Overview
ESP8266EX offers a complete and self-contained Wi-Fi networking solution; it can be used to
host the application or to o ffload Wi-Fi networking functions from another application processor.
When ESP8266EX hosts the application, it boots up directly from an external flash. In has
integrated cache to improve the performance of the system in such applications.
Alternately, serving as a Wi-Fi adapter, wireless internet access can be added to any
microcontroller-based design with simple connectivity through UART interface or the CPU AHB
bridge interface.
ESP8266EX is among the most integrated WiFi chip in the industry; it integrates the antenna
switches, RF balun, power amplifier, low noise receive amplifier, filters, power management
modules, it requires minimal external circuitry, and the entire solution, including front-end module,
is designed to occupy minimal PCB area.
ESP8266EX also integrates an enhanced version of Tensilica’s L106 Diamond series 32-bit
processor, with on-chip SRAM, besides the Wi-Fi functionalities. ESP8266EX is often integrated
with external sensors and other application specific devices through its GPIOs; codes for such
applications are provided in examples in the SDK.
Sophisticated system-level features include fast sleep/wake context switching for energy-e fficient
VoIP, adaptive radio biasing for low-power operation, advance signal processing, and spur
cancellation and radio co-existence features for common cellular, Bluetooth, DDR, LVDS, LCD
interference mitigation.
2. Features
▪ 802.11 b/g/n protocol
▪ Wi-Fi Direct (P2P), soft-AP
▪ Integrated TCP/IP protocol stack
▪ Integrated TR switch, balun, LNA, power amplifier and matching network
▪ Integrated PLL, regulators, and power management units
▪ +19.5dBm output power in 802.11b mode
▪ Supports antenna diversity
▪ Power down leakage current of < 10uA
▪ Integrated low power 32-bit MCU
▪ SDIO 2.0, SPI, UART
▪ STBC, 1x1 MIMO, 2x1 MIMO
▪ A-MPDU & A-MSDU aggregation & 0.4 μs guard interval
▪ Wake up and transmit packets in < 2ms
▪ Standby power consumption of < 1.0mW (DTIM3)
3.Application Diagrams
4. Ultra Low Power Technology
ESP8266EX has been designed for mobile, wearable electronics and Internet of Things
applications with the aim of achieving the lowest power consumption with a combination of
several proprietary techniques. The power saving architecture operates mainly in 3 modes: active
mode, sleep mode and deep sleep mode.
By using advance power management techniques and logic to power-down functions not
required and to control switching between sleep and active modes, ESP8266EX consumes about
than 60uA in deep sleep mode (with RTC clock still running) and less than 1.0mA (DTIM=3) or less
than 0.5mA (DTIM=10) to stay connected to the access point.
When in sleep mode, only the calibrated real-time clock and watchdog remains active. The realtime clock can be programmed to wake up the ESP8266EX at any required interval.
The ESP8266EX can be programmed to wake up when a specified condition is detected. This
minimal wake-up time feature of the ESP8266EX can be utilized by mobile device SOCs, allowing
them to remain in the low-power standby mode until Wi-Fi is needed.
In order to satisfy the power demand of mobile and wearable electronics, ESP8266EX can be
programmed to reduce the output power of the PA to fit various application profiles, by trading off range for power consumption.
5.Integration of External Components
By integrating the costliest components such as power management unit, TR switch, RF balun,
high power PA capable of delivering +25dBm (peak), ESP8266EX ensures that the BOM cost is
the lowest possible, and ease of integration into any system.
With ESP8266, the only external BOM are resistors, capacitors, and crystal. For cellphone
compatibility a SAW filter may be required.
6. ESP8266EX Applications
▪ Smart power plugs
▪ Home automation
▪ Mesh network
▪ Industrial wireless control
▪ Baby monitors
▪ IP Cameras
▪ Sensor networks
▪ Wearable electronics
▪ Wi-Fi location-aware devices
▪ Security ID tags
▪ Wi-Fi position system beacons
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E-mail:nicole@aithinker.com
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