ESP8266 Serial WiFi Module – ESP-WROOM-02 (2MB Flash, 16Mbit, UART Wireless)

Description

Product Overview

The ESP-WROOM-02 (4MB) is a highly integrated, certified Wi-Fi module developed by Espressif Systems, the original creator of the ESP8266 ecosystem. This variant features 4 MB (32 Mbit) of SPI flash memory, doubling the storage capacity of the standard version and providing significantly more space for complex applications, web interfaces, and OTA (Over-The-Air) updates .

At its heart lies the ESP8266EX chip—a 32-bit Tensilica L106 RISC processor running at up to 160 MHz, with 50 kB of RAM available for user applications . The module supports 802.11 b/g/n Wi-Fi protocols at 2.4 GHz, with a built-in PCB antenna that delivers up to +20.5 dBm output power and excellent receiver sensitivity down to -98 dBm .

Unlike many third-party ESP8266 modules, the ESP-WROOM-02 is designed and manufactured by Espressif, ensuring full compliance with RF certifications including FCC, CE-RED, and TELEC, making it the ideal choice for commercial products requiring regulatory approval . It comes preloaded with AT command firmware, allowing you to add Wi-Fi connectivity to any microcontroller using simple serial commands, or you can reprogram it as a standalone IoT processor using the Arduino IDE, MicroPython, or ESP-IDF.

Key Features

• Official Espressif Module: Designed and manufactured by Espressif Systems, the creators of the ESP8266, ensuring the highest quality and reliable RF performance .

• 4 MB Flash Memory: Equipped with 4 MB (32 Mbit) of SPI flash memory—double the capacity of standard ESP-WROOM-02 modules—providing ample storage for complex firmware, web interfaces, and OTA (Over-The-Air) updates .

• Integrated 32-bit Processor: Powered by the Tensilica L106 32-bit RISC processor running at up to 160 MHz, capable of running application code independently without an external microcontroller .

• Complete Wi-Fi Solution: Supports 802.11 b/g/n protocols at 2.4 GHz with integrated PCB antenna. Delivers up to +20.5 dBm output power with receiver sensitivity down to -98 dBm .

• Preloaded AT Command Firmware: Ships with industrial-grade AT firmware that allows control via simple serial commands, enabling rapid integration with any microcontroller .

• Multiple Operating Modes: Supports Station (STA), SoftAP (Access Point), and SoftAP + STA modes, enabling devices to connect to existing networks or create their own.

• Rich Peripheral Interfaces: Provides UART, HSPI, I2C, I2S, PWM, and 10-bit ADC interfaces, allowing connection to a wide variety of sensors, actuators, and display devices .

• Ultra-Low Power Consumption: Features multiple sleep modes with deep sleep current as low as 20 µA and standby power consumption less than 1.0 mW (DTIM3), making it ideal for battery-powered applications .

• Global Regulatory Certifications: Certified with FCC, CE-RED, TELEC, and KC, simplifying the certification process for commercial products .

• Wide Operating Temperature: Rated for operation from -40°C to +85°C, suitable for demanding industrial environments and outdoor installations .

• Compact SMD Package: Measures just 18.0 mm × 20.0 mm × 2.8 mm with 18 castellated pins, designed for automated surface-mount assembly .

• Upgradable Firmware: Supports local serial flashing, OTA (Over-The-Air) updates, and host download for flexible firmware management.

Technical Specifications