product features

PRODUCT FEATURES

Support 802.11b/g/n protocol

Built-in Tensilica L106 ultra-low power consumption 32-bit micro MCU, main frequency supports 80 MHz and 160 MHz, supports RTOS

Built-in 10-bit high precision ADC

Built-in TCP/IP protocol stack

Built-in TR switch, balun, LNA, power amplifier and matching network

Built-in PLL, voltage regulator and power management components, +20 dBm output power in 802.11b mode

A-MPDU, A-MSDU aggregation and 0.4s guard interval

WiFi@2.4 GHz, support WPA/WPA2 security mode

Support STA/AP/STA+AP working mode

Support Smart Config function (airkiss, esp-touch)

Standby power consumption is less than 1.0mW

Product Image

PRODUCT PICTURES

Hardware description

HARDWARE DESCRIPTION

Pin description

Pin mode

Interface Description

Other interface description

Built-in MCU description

ESP8266EX has built-in Tensilica L106 ultra-low power consumption 32-bit micro MCU with 16-bit compact mode, main frequency supports 80MHz and 160 MHz, and RTOS. Currently, only 20% of MIPS is used in the WiFi protocol stack, and the rest can be used for application development. MCU can cooperate with other parts of the chip through the following interfaces:

    1. The coded RAM/ROM interface (iBus) that connects to the storage controller and can also be used to access the external flash memory

    2. Also connect to the data RAM interface of the storage controller (dBus)

    3. AHB interface to access registers

Built-in SRAM and ROM

The ESP8266EX chip has a built-in storage controller, including ROM and SRAM. The MCU can access the memory controller through iBus, dBus and AHB interfaces. These interfaces can access ROM or RAM units, and the storage arbiter determines the running sequence in the order of arrival.

Based on the current use of SRAM in Espressif’s Demo SDK, the remaining SRAM space available to users is: RAM size < 36kB (In station mode, the heap+data area can be roughly 36KB after connecting to the router.) There is currently no programmable ROM on the ESP8266EX chip. , The user program is stored in SPI Flash.

SPI Flash

The current ESP8266EX chip supports external Flash using SPI interface, theoretically it can support up to 16 MB of SPI flash. At present, the external connection of this module is 4MB SPI Flash.

Recommended Flash capacity: 1 MB-16MB. Supported SPI modes: Support Standard SPI, Dual SPI, DIO SPI, QIO SPI, and Quad SPI.

Note that you need to select the corresponding mode in the download tool when downloading the firmware, otherwise the program will not run correctly after downloading.

Crystal oscillator

    Currently crystals 40M, 26M and 24M are all supported. Please pay attention to selecting the corresponding crystal type in the download tool when using it. 4.5V~5.5V. The ground adjustment capacitors C1 and C2 added to the crystal oscillator input and output can not be set to fixed values. The value range is 6pF~22pF. The specific value needs to be adjusted and determined after system testing.

    Based on the current mainstream crystal oscillators in the market, the capacitances C1 and C2 added to the input and output of a general 26Mhz crystal oscillator are within 10pF; the capacitances added to the input and output of a general 40MHz crystal oscillator are 10pF<C1, C2<22pF. The selected crystal oscillator must have an accuracy of ±10PPM. The operating temperature of the crystal oscillator is -20℃-85℃.

    The position of the crystal oscillator should be as close as possible to the XTAL Pins of the chip (the trace should not be too long), and the trace of the crystal oscillator must be wrapped with ground for good shielding. Input and output wiring cannot be perforated, that is, they cannot cross layers. The input and output traces of the crystal oscillator cannot cross, nor can cross layers. Please place the bypass capacitors for the input and output of the crystal oscillator close to the left and right sides of the chip, and try not to put it on the niche.

Function Description

FUNCTION DESCRIPTION

Module functions can be divided into two modes: serial port to WiFi STA and serial port to WiFi AP.

Serial port working status conversion

The module defines the working status of the serial port as two modes: transparent transmission mode and AT command mode. After normal power-on, the module automatically enters the AT command mode.

    How to enter transparent transmission mode in AT command mode:

    Send AT command: AT+CIPMODE=1 (enable transparent transmission mode)

    ·After enabling the transparent transmission mode, you need to send the AT+CIPSEND command to send the transparent data.

    Steps to enter AT command mode in transparent transmission mode:

    1. Exit sending data: In the process of transparently transmitting data, if a single packet of data "+++" is recognized, then the transparently transmitting will be exited.

    ·If you use the keyboard to type in "+++", it may take too long, and it is not considered as three consecutive "+". It is recommended to use a serial port to send "+++" at once, and Please be careful not to carry invisible characters such as spaces or line feeds.
·After that, please wait at least 1 second before sending the next AT command

2. Send AT command: AT+CIPMODE=0 (exit transparent transmission mode)

The serial port/network data conversion of the product is divided into 4 modes: TCP Server, TCP Clinet, UDP Server, UDP Client.

TCP Sercer

TCP Client

UDP Server

UDP Client