Data Sheet

About This Guide
This document introduces the specifications of ESP8266EX, including the following topics.
Release Notes
Chapter
Title
Subject
Chapter 1
Overview
Provides an overview of ESP8266, including its features, protocols,
technical parameters and applications.
Chapter 2
Pin Definitions
Provides the pin layout and the relevant description.
Chapter 3
Functional
Description
Describes major functional modules integrated on ESP8266EX including
CPU, flash and memory, clock, radio, Wi-Fi, and low-power
management.
Chapter 4
Peripheral Interface
Provides descriptions of peripheral interfaces integrated on
ESP8266EX.
Chapter 5
Electrical
Specifications
Lists the electrical data of ESP8266EX.
Chapter 6
Package Information
Illustrates the package details for ESP8266EX.
Appendix Ⅰ
Pin List
Provides detailed pin information, including digital die pin list, buffer
sheet, register list, and strapping pin list.
Appendix Ⅱ
Learning Resources
Provides a list of ESP8266-related must-read documents and must-
have resources.
Date
Version
Release Notes
2015.12
V4.6
Updated Chapter 3.
2016.02
V4.7
Updated Section 3.6 and Section 4.1.
2016.04
V4.8
Updated Chapter 1.
2016.08
V4.9
Updated Chapter 1.
2016.11
V5.0
Added Appendix Ⅱ “Learning Resources”.
2016.11
V5.1
Changed the power consumption during Deep-sleep from 10 μA to 20 μA
in Table 5-2.
2016.11
V5.2
Changed the crystal frequency range from “26 MHz to 52 MHz” to “24
MHz to 52 MHz” in Section 3.3.
2016.12
V5.3
Changed the minimum working voltage from 3.0V to 2.5V.
2017.04
V5.4
Changed chip input and output impedance from 50Ω to 39+j6 Ω.