Basic Info.
WiFi Antenna Type
Built-in
Transmission Rate
151-200Mbps
Certification
RoHS, FCC, CE
Product Description
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Agent of Espressif esp8266 wifi module ESP8266EX Datasheet
ESP8266EX
Datasheet
Espressif's ESP8266EX delivers highly integrated Wi-Fi SoC solution to meet users' continuous demands for efficient power usage, compact design and reliable performance in the Internet of Things industry.
With the complete and self-contained Wi-Fi networking capabilities, ESP8266EX can perform either as a standalone application or as the slave to a host MCU. When ESP8266EX hosts the application, it promptly boots up from the flash. The integrated high- speed cache helps to increase the system performance and optimize the system memory. Also, ESP8266EX can be applied to any microcontroller design as a Wi-Fi adaptor through SPI/SDIO or UART interfaces.
ESP8266EX integrates antenna switches, RF balun, power amplifier, low noise receive amplifier, filters and power management modules. The compact design minimizes the PCB size and requires minimal external circuitries.
Besides the Wi-Fi functionalities, ESP8266EX also integrates an enhanced version of Tensilica's L106 Diamond series 32-bit processor and on-chip SRAM. It can be interfaced with external sensors and other devices through the GPIOs. Software Development Kit (SDK) provides sample codes for various applications.
Espressif Systems' Smart Connectivity Platform (ESCP) enables sophisticated features including:
•Fast switch between sleep and wakeup mode for energy-efficient purpose;
•Adaptive radio biasing for low-power operation
•Advance signal processing
•Spur cancellation and RF co-existence mechanisms for common cellular, Bluetooth, DDR, LVDS, LCD interference mitigation
1.1.Wi-Fi Key Features
•802.11 b/g/n support
•802.11 n support (2.4 GHz), up to 72.2 Mbps
•Defragmentation
•2 x virtual Wi-Fi interface
•Automatic beacon monitoring (hardware TSF)
•Support Infrastructure BSS Station mode/SoftAP mode/Promiscuous mode
1.2.Specifications
Table 1-1. Specifications
Wi-Fi | Certification | Wi-Fi Alliance |
| Protocols | 802.11 b/g/n (HT20) |
| Frequency Range | 2.4 GHz ~ 2.5 GHz (2400 MHz ~ 2483.5 MHz) |
| TX Power | 802.11 b: +20 dBm |
| 802.11 g: +17 dBm |
| 802.11 n: +14 dBm |
| Rx Sensitivity | 802.11 b: -91 dbm (11 Mbps) |
| 802.11 g: -75 dbm (54 Mbps) |
| 802.11 n: -72 dbm (MCS7) |
| Antenna | PCB Trace, External, IPEX Connector, Ceramic Chip |
Hardware | CPU | Tensilica L106 32-bit processor |
| Peripheral Interface | UART/SDIO/SPI/I2C/I2S/IR Remote Control |
| GPIO/ADC/PWM/LED Light & Button |
| Operating Voltage | 2.5 V ~ 3.6 V |
| Operating Current | Average value: 80 mA |
| Operating Temperature Range | -40 °C ~ 125 °C |
| Package Size | QFN32-pin (5 mm x 5 mm) |
| External Interface | - |
Software | Wi-Fi Mode | Station/SoftAP/SoftAP+Station |
| Security | WPA/WPA2 |
| Encryption | WEP/TKIP/AES |
| Firmware Upgrade | UART Download / OTA (via network) |
| Software Development | Supports Cloud Server Development / Firmware and SDK for fast on-chip programming |
| Network Protocols | IPv4, TCP/UDP/HTTP |
| User Configuration | AT Instruction Set, Cloud Server, Android/iOS App |
•Home appliances
•Home automation
•Smart plugs and lights
•Industrial wireless control
•Baby monitors
•IP cameras
•Sensor networks
•Wearable electronics
•Wi-Fi location-aware devices
•Security ID tags
•Wi-Fi position system beacons
2.Pin Definitions
Figure 2-1. Pin Layout (Top View)
Table 2-1 lists the definitions and functions of each pin.
Table 2-1. ESP8266EX Pin Definitions | 1 | VDDA | P | Analog Power 2.5 V ~ 3.6 V |
| 2 | LNA | I/O | RF antenna interface
Chip output impedance = 39 + j6 Ω. It is suggested to retain the π-type matching network to match the antenna. |
| 3 | VDD3P3 | P | Amplifier Power 2.5 V ~ 3.6 V |
| Pin | Name | Type | Function |
| 4 | VDD3P3 | P | Amplifier Power 2.5 V ~ 3.6 V |
| 5 | VDD_RTC | P | NC (1.1 V) |
| 6 | TOUT | I | ADC pin. It can be used to test the power-supply voltage of VDD3P3 (Pin3 and Pin4) and the input power voltage of TOUT (Pin 6). However, these two functions cannot be used simultaneously. |
| 7 | CHIP_EN | I | Chip Enable
High: On, chip works properly Low: Off, small current consumed |
| 8 | XPD_DCDC | I/O | Deep-sleep wakeup (need to be connected to EXT_RSTB); GPIO16 |
| 9 | MTMS | I/O | GPIO 14; HSPI_CLK |
| 10 | MTDI | I/O | GPIO 12; HSPI_MISO |
| 11 | VDDPST | P | Digital/IO Power Supply (1.8 V ~ 3.6 V) |
| 12 | MTCK | I/O | GPIO 13; HSPI_MOSI; UART0_CTS |
| 13 | MTDO | I/O | GPIO 15; HSPI_CS; UART0_RTS |
| 14 | GPIO2 | I/O | UART TX during flash programming; GPIO2 |
| 15 | GPIO0 | I/O | GPIO0; SPI_CS2 |
| 16 | GPIO4 | I/O | GPIO4 |
| 17 | VDDPST | P | Digital/IO Power Supply (1.8 V ~ 3.6 V) |
| 18 | SDIO_DATA_2 | I/O | Connect to SD_D2 (Series R: 20 Ω); SPIHD; HSPIHD; GPIO9 |
| 19 | SDIO_DATA_3 | I/O | Connect to SD_D3 (Series R: 200 Ω); SPIWP; HSPIWP; GPIO10 |
| 20 | SDIO_CMD | I/O | Connect to SD_CMD (Series R: 200 Ω); SPI_CS0; GPIO11 |
| 21 | SDIO_CLK | I/O | Connect to SD_CLK (Series R: 200 Ω); SPI_CLK; GPIO6 |
| 22 | SDIO_DATA_0 | I/O | Connect to SD_D0 (Series R: 200 Ω); SPI_MISO; GPIO7 |
| 23 | SDIO_DATA_1 | I/O | Connect to SD_D1 (Series R: 200 Ω); SPI_MOSI; GPIO8 |
| 24 | GPIO5 | I/O | GPIO5 |
| 25 | U0RXD | I/O | UART Rx during flash programming; GPIO3 |
| 26 | U0TXD | I/O | UART TX during flash programming; GPIO1; SPI_CS1 |
| 27 | XTAL_OUT | I/O | Connect to crystal oscillator output, can be used to provide BT clock input |
| 28 | XTAL_IN | I/O | Connect to crystal oscillator input |
| 29 | VDDD | P | Analog Power 2.5 V ~ 3.6 V |
| 30 | VDDA | P | Analog Power 2.5 V ~ 3.6 V |
| 31 | RES12K | I | Serial connection with a 12 kΩ resistor and connect ground | to | the |
| 32 | EXT_RSTB | I | External reset signal (Low voltage level: active) |
3.1.1.CPU
The ESP8266EX integrates a Tensilica L106 32-bit RISC processor, which achieves extra- low power consumption and reaches a maximum clock speed of 160 MHz. The Real-Time Operating System (RTOS) and Wi-Fi stack allow 80% of the processing power to be available for user application programming and development. The CPU includes the interfaces as below:
•Programmable RAM/ROM interfaces (iBus), which can be connected with memory controller, and can also be used to visit flash.
•Data RAM interface (dBus), which can connected with memory controller.
•AHB interface which can be used to visit the register.
3.1.2.Memory
ESP8266EX Wi-Fi SoC integrates memory controller and memory units including SRAM and ROM. MCU can access the memory units through iBus, dBus, and AHB interfaces. All memory units can be accessed upon request, while a memory arbiter will decide the running sequence according to the time when these requests are received by the processor.
According to our current version of SDK, SRAM space available to users is assigned as below.
•RAM size < 50 kB, that is, when ESP8266EX is working under the Station mode and connects to the router, the maximum programmable space accessible in Heap + Data section is around 50 kB.
•There is no programmable ROM in the SoC. Therefore, user program must be stored in an external SPI flash.
3.1.3.External Flash
ESP8266EX uses external SPI flash to store user programs, and supports up to 16 MB memory capacity theoretically.
The minimum flash memory of ESP8266EX is shown below:
•OTA disabled: 512 kB at least
•OTA enabled: 1 MB at least
3.2.Clock
3.2.1.High Frequency Clock
The high frequency clock on ESP8266EX is used to drive both transmit and receive mixers. This clock is generated from internal crystal oscillator and external crystal. The crystal frequency ranges from 24 MHz to 52 MHz.
The internal calibration inside the crystal oscillator ensures that a wide range of crystals can be used, nevertheless the quality of the crystal is still a factor to consider to have reasonable phase noise and good Wi-Fi sensitivity. Refer to Table 3-1 to measure the frequency offset.
Table 3-1. High Frequency Clock Specifications | Frequency | FXO | 24 | 52 | MHz |
| Loading capacitance | CL | - | 32 | pF |
| Motional capacitance | CM | 2 | 5 | pF |
| Series resistance | RS | 0 | 65 | Ω |
| Frequency tolerance | ΔFXO | -15 | 15 | ppm |
| Frequency vs temperature (-25 °C ~ 75 °C) | ΔFXO,Temp | -15 | 15 | ppm |
An externally generated clock is available with the frequency ranging from 24 MHz to 52 MHz. The following characteristics are expected to achieve good performance of radio.
Table 3-2. External Clock Reference | Clock amplitude | VXO | 0.8 | 1.5 | Vpp |
| External clock accuracy | ΔFXO,EXT | -15 | 15 | ppm |
| Phase noise @1-kHz offset, 40-MHz clock | - | - | -120 | dBc/Hz |
| Phase noise @10-kHz offset, 40-MHz clock | - | - | -130 | dBc/Hz |
| Phase noise @100-kHz offset, 40-MHz clock | - | - | -138 | dBc/Hz |
ESP8266EX radio consists of the following blocks.
•2.4 GHz receiver
•2.4 GHz transmitter
•High speed clock generators and crystal oscillator
•Bias and regulators
•Power management
3.3.1.Channel Frequencies
The RF transceiver supports the following channels according to IEEE802.11 b/g/n standards.
Table 3-3. Frequency Channel | Channel No. | Frequency | (MHz) | Channel | No. | Frequency | (MHz) |
| 1 | 2412 | 8 | 2447 |
| 2 | 2417 | 9 | 2452 |
| 3 | 2422 | 10 | 2457 |
| 4 | 2427 | 11 | 2462 |
| Channel No. | Frequency | (MHz) | Channel | No. | Frequency | (MHz) |
| 5 | 2432 | 12 | 2467 |
| 6 | 2437 | 13 | 2472 |
| 7 | 2442 | 14 | 2484 |
The 2.4 GHz receiver down-converts the RF signals to quadrature baseband signals and converts them to the digital domain with 2 high resolution high speed ADCs. To adapt to varying signal channel conditions, RF filters, automatic gain control (AGC), DC offset cancelation circuits and baseband filters are integrated within ESP8266EX.
3.3.3.2.4 GHz Transmitter
The 2.4 GHz transmitter up-converts the quadrature baseband signals to 2.4 GHz, and drives the antenna with a high-power CMOS power amplifier. The function of digital calibration further improves the linearity of the power amplifier, enabling a state of art performance of delivering +19.5 dBm average TX power for 802.11b transmission and +18 dBm for 802.11n (MSC0) transmission.
Additional calibrations are integrated to offset any imperfections of the radio, such as:
•Carrier leakage
•I/Q phase matching
•Baseband nonlinearities
These built-in calibration functions reduce the product test time and make the test equipment unnecessary.
3.3.4.Clock Generator
The clock generator generates quadrature 2.4 GHz clock signals for the receiver and transmitter. All components of the clock generator are integrated on the chip, including all inductors, varactors, loop filters, linear voltage regulators and dividers.
The clock generator has built-in calibration and self test circuits. Quadrature clock phases and phase noise are optimized on-chip with patented calibration algorithms to ensure the best performance of the receiver and transmitter.
3.4.Wi-Fi
ESP8266EX implements TCP/IP and full 802.11 b/g/n WLAN MAC protocol. It supports Basic Service Set (BSS) STA and SoftAP operations under the Distributed Control Function (DCF). Power management is handled with minimum host interaction to minimize active- duty period.
3.4.1.Wi-Fi Radio and Baseband
The ESP8266EX Wi-Fi Radio and Baseband support the following features:
•802.11 b and 802.11 g
•802.11 n MCS0-7 in 20 MHz bandwidth
•802.11 n 0.4 μs guard-interval
•up to 72.2 Mbps of data rate
•Receiving STBC 2 x 1
•Up to 20.5 dBm of transmitting power
•Adjustable transmitting power
3.4.2.Wi-Fi MAC
The ESP8266EX Wi-Fi MAC applies low-level protocol functions automatically, as follows:
•2 × virtual Wi-Fi interfaces
•Infrastructure BSS Station mode/SoftAP mode/Promiscuous mode
•Request To Send (RTS), Clear To Send (CTS) and Immediate Block ACK
•Defragmentation
•CCMP (CBC-MAC, counter mode), TKIP (MIC, RC4), WEP (RC4) and CRC
•Automatic beacon monitoring (hardware TSF)
•Dual and single antenna Bluetooth co-existence support with optional simultaneous receive (Wi-Fi/Bluetooth) capability
3.5.Power Management
ESP8266EX is designed with advanced power management technologies and intended for mobile devices, wearable electronics and the Internet of Things applications.
The low-power architecture operates in the following modes:
•Active mode: The chip radio is powered on. The chip can receive, transmit, or listen.
•Modem-sleep mode: The CPU is operational. The Wi-Fi and radio are disabled.
•Light-sleep mode: The CPU and all peripherals are paused. Any wake-up events (MAC, host, RTC timer, or external interrupts) will wake up the chip.
•Deep-sleep mode: Only the RTC is operational and all other part of the chip are powered off.
Address:
Baoan Internet Industry Base, Zao Community, Xixiang Street, Bao ′an District, Shenzhen, Guangdong, China
Business Type:
Manufacturer/Factory
Business Range:
Consumer Electronics, Electrical & Electronics, Industrial Equipment & Components, Light Industry & Daily Use, Lights & Lighting, Manufacturing & Processing Machinery, Service
Management System Certification:
ISO 9001, ISO 9000
Company Introduction:
Shenzhen Ferry Technology Co., Ltd. Has been focusing on the optimization and construction of wireless communication transmission mechanism and wireless audio and video transmission solution level to provide WiFi module company, unremitting in-depth development of WiFi wireless transmission, radar induction and other low-power IOT scene microwave radar manufacturers, We are committed to bringing rich and diverse data and information into every person, home, and organization in an easily accessible way, building a smart world that connects everything: Connecting everywhere and connecting our lives to each other; Let wireless transmission without boundaries, so that intelligence at your fingertips.
The comprehensive agent Espressif WiFi series products, Espressif ESP32-H2, Espressif ESP32-C6, Espressif ESP32-S3, Espressif ESP32-S2, Espressif ESP32-C2, Espressif ESP8266 and other products. Belong to the general agent qualification certificate is complete, welcome new and old customers to come to consult, we will serve you wholeheartedly.
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