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 ESP8266EX Datasheet Version 4.3 Espressif Systems IOT Team http://bbs.espressif.com/ Copyright © 2015 ESP8266 Datasheet Espressif Systems Disclaimer and Copyright Notice Information in this document, including URL references, is subject to change without notice. THIS
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    ESP8266EX Datasheet    Version 4.3 Espressif Systems IOT Team http://bbs.espressif.com/ Copyright   © 2015         Disclaimer and Copyright Notice Information in this document, including URL references, is subject to change without notice. THIS DOCUMENT IS PROVIDED AS IS WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. All liability, including liability for infringement of any proprietary rights, relating to use of information in this document is disclaimed. No licenses express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein. The Wi-Fi Alliance Member Logo is a trademark of the WiFi Alliance. All trade names, trademarks and registered trademarks mentioned in this document are property of their respective owners, and are hereby acknowledged. Copyright © 2015 Espressif Systems. All rights reserved.                  1. General Overview 6 .................................................................................................. 1.1. Introduction 6 .............................................................................................................1.2. Features 7 ....................................................................................................................1.3. Parameters 7 ...............................................................................................................1.4. Ultra Low Power Technology 9 .................................................................................1.5. Major Applications 9 .................................................................................................. 2. Hardware Overview 11 ............................................................................................. 2.1. Pin Definitions 11 .........................................................................................................2.2. Electrical Characteristics 13 ........................................................................................2.3. Power Consumption 13 .............................................................................................2.4. Receiver Sensitivity 14 ...............................................................................................2.5. MCU 15 ........................................................................................................................2.6. Memory Organization 15 ..........................................................................................2.6.1. Internal SRAM and ROM 15 ......................................................................................2.6.2. External SPI Flash 15 ..................................................................................................2.7. AHB and AHB Blocks 16 ............................................................................................ 3. Pins and Definitions 17 ............................................................................................. 3.1. GPIO 17 .......................................................................................................................3.1.1. General Purpose Input/Output Interface (GPIO) 17 .............................................          Table of Contents         3.2. Secure Digital Input/Output Interface (SDIO) 18 ..................................................3.3. Serial Peripheral Interface (SPI/HSPI) 18 .................................................................3.3.1. General SPI (Master/Slave) 18 .................................................................................3.3.2. SDIO / SPI (Slave) 19 .................................................................................................3.3.3. HSPI (Master/Slave) 19 .............................................................................................3.4. Inter-integrated Circuit Interface (I2C) 19 ...............................................................3.5. I2S 20 ...........................................................................................................................3.6. Universal Asynchronous Receiver Transmitter (UART) 20 .....................................3.7. Pulse-Width Modulation (PWM) 21 .........................................................................3.8. IR Remote Control 22 ................................................................................................3.9. ADC (Analog-to-digital Converter) 22 ....................................................................3.10. LED Light and Button 24 ........................................................................................... 4. Firmware & Software Development Kit 26 ............................................................ 4.1. Features 26 .................................................................................................................. 5. Power Management 27 ............................................................................................6. Clock Management 28 ............................................................................................. 6.1. High Frequency Clock 28 ..........................................................................................6.2. External Reference Requirements 29 ...................................................................... 7. Radio 29 ...................................................................................................................... 7.1. Channel Frequencies 30 ...........................................................................................7.2. 2.4 GHz Receiver 30 ..................................................................................................7.3. 2.4 GHz Transmitter 30 ..............................................................................................         
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