Important points about ESP8266EX chipset

 

• ESP8266 can be programmed via UART or OTA (over-the-air)
• ESP8266 supports Wi-Fi Direct, SoftAP, station mode
• User program has to be stored in an external flash. 
• The various power modes supported are
• Active Mode
• Modem-sleep mode
• Light-sleep mode
• Deep-sleep mode
• Shut down mode
• Under shut-down mode, ESP8266EX consumes 0.5uA
• The internal ROM of ESP8266 cannot be programmed
• ESP8266EX supports 4 PWM pins
• ESP8266EX has 1 ADC pin 
• External memory can be up to 16MB
• ESP8266EX supports SPI to connect to external flash
• Three modes - Standard SPI, Dual SPI, Quad SPI are supported
• ESP8266EX integrates a Tensilica L106 32-bit RISC processor
• ESP8266EX can operate up to a maximum operating frequency of 160MHz
• ESP8266EX implements TCP/IP and full 802.11 b/g/n WLAN MAC protocol 
• Number of modules of different variants are available in the market
• ESP8266EX supports following peripherals - 17 GPIO, I2C, SPI, I2S, UART, ADC
• ESP8266EX supports 10-bit resolution for the ADC
• All the 17 GPIO from ESP8266EX can be used in an application as they are multiplexed
• The boot information from ESP8266EX is output from UART port after power up
• ESP8266EX operating voltage is 3.3V, so, 5V is not supported
• ESP8266EX integrates Wi-Fi stack
• ESP8266EX has 2.4GHz Transmitter and Receiver
• ESP8266EX supports 802.11 b/g/n
• Maximum power output supported by ESP8266EX is +20 dBm which is 0.1W