About This Guide
This document introduces the specifications of ESP8266EX.
Release Notes
Date
2015.12
2016.02
2016.04
2016.08
2016.11
2016.11
2016.11
2016.12
2017.04
2017.10
2017.11
2017.11
2018.02
Version
V4.6
V4.7
V4.8
V4.9
V5.0
V5.1
V5.2
V5.3
V5.4
V5.5
V5.6
V5.7
V5.8
Release Notes
Updated Chapter 3.
Updated Section 3.6 and Section 4.1.
Updated Chapter 1.
Updated Chapter 1.
Added Appendix
Ⅱ
“Learning Resources”.
Changed the power consumption during Deep-sleep from 10
μA
to 20
μA
in Table 5-2.
Changed the crystal frequency range from “26 MHz to 52 MHz” to “24
MHz to 52 MHz” in Section 3.3.
Changed the minimum working voltage from 3.0V to 2.5V.
Changed chip input and output impedance from 50Ω to 39+j6
Ω.
Updated Chapter 3 regarding the range of clock amplitude to 0.8 ~ 1.5V.
Updated VDDPST from 1.8V ~ 3.3V to 1.8V ~ 3.6V.
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Corrected a typo in the description of SDIO_DATA_0 in Table 2-1;
Added the testing conditions for the data in Table 5-2.
Updated Wi-Fi protocols in Section 1.1;
Updated description of the integrated Tensilica processor in 3.1.
Update document cover;
Added a note for Table 1-1;
Updated Wi-Fi key features in Section 1.1;
Updated description of the Wi-Fi function in 3.5;
Updated pin layout diagram;
Fixed a typo in Table 2-1;
Removed Section AHB and AHB module;
Restructured Section Power Management;
Fixed a typo in Section UART;
Removed description of transmission angle in Section IR Remote
Control;
Other optimization (wording).
2018.09
V5.9
Table of Contents
1. Overview ................................................................................................................................ 1
1.1. Wi-Fi Key Features .....................................................................................................................1
1.2. Specifications
.............................................................................................................................2
1.3. Applications ...............................................................................................................................3
2. Pin Definitions ........................................................................................................................4
3. Functional Description ..........................................................................................................6
3.1. CPU, Memory, and Flash ...........................................................................................................6
3.1.1. CPU ...............................................................................................................................6
3.1.2. Memory
..........................................................................................................................6
3.1.3. External Flash ................................................................................................................7
3.2. Clock ..........................................................................................................................................7
3.2.1. High Frequency Clock ...................................................................................................7
3.2.2. External Clock Requirements ........................................................................................8
3.3. Radio ..........................................................................................................................................8
3.3.1. Channel Frequencies .....................................................................................................8
3.3.2. 2.4 GHz Receiver ...........................................................................................................9
3.3.3. 2.4 GHz Transmitter .......................................................................................................9
3.3.4. Clock Generator ............................................................................................................9
3.4. Wi-Fi ...........................................................................................................................................9
3.4.1. Wi-Fi Radio and Baseband ............................................................................................9
3.4.2. Wi-Fi MAC ...................................................................................................................10
3.5. Power Management .................................................................................................................10
4. Peripheral Interface ............................................................................................................. 12
4.1. General Purpose Input/Output Interface (GPIO) ......................................................................12
4.2. Secure Digital Input/Output Interface (SDIO) ...........................................................................12
4.3. Serial Peripheral Interface (SPI/HSPI) ......................................................................................13
4.3.1. General SPI (Master/Slave) ..........................................................................................13
4.3.2. HSPI (Slave) .................................................................................................................13
4.4. I2C Interface .............................................................................................................................14
4.5. I2S Interface .............................................................................................................................14
4.6. Universal Asynchronous Receiver Transmitter (UART) ............................................................ 14
4.7. Pulse-Width Modulation (PWM) ...............................................................................................15
4.8. IR Remote Control
....................................................................................................................16
4.9. ADC (Analog-to-Digital Converter) ...........................................................................................16
5. Electrical Specifications ......................................................................................................18
5.1. Electrical Characteristics
..........................................................................................................18
5.2. RF Power Consumption ...........................................................................................................18
5.3. Wi-Fi Radio Characteristics .....................................................................................................19
6. Package Information ...........................................................................................................20
I. Appendix - Pin List ..............................................................................................................21
II. Appendix - Learning Resources .........................................................................................22
II.1.
II.2.
Must-Read Documents ............................................................................................................22
Must-Have Resources
..............................................................................................................22
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