ESP-WROOM-02D and ESP-WROOM-02U are ESP8266EX-based modules developed by Espressif. Compared to ESP-WROOM-02, the RF performance of ESP-WROOM-02D and ESP-WROOM-02U are optimized. Besides, ESP-WROOM-02U integrates a U.FL connector.
The ESP8266EX integrates a Tensilica L106 32-bit RISC processor, which achieves extralow 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.
ESP8266EX Wi-Fi SoC integrates the memory controller and memory units including ROM and SRAM. MCU can access the memory units through iBus, dBus, and AHB interfaces. All memory units can be accessed upon request. A memory arbiter determines the running sequence in the arrival order of requests.
According to our current version of SDK, the SRAM space available to users is assigned as follows:
- RAM size < 50 kB, that is, when ESP8266EX is working in Station mode and connects to the router, available space in the Heap + Data sector is around 50 kB.
- There is no programmable ROM in ESP8266EX, therefore, the user program must be stored in an external SPI flash.
ESP8266EX supports SPI flash. Theoretically speaking, ESP8266EX can support an up to 16 MB SPI flash. ESP-WROOM-02D and ESP-WROOM-02U currently integrate a 2-MB SPI flash. ESPWROOM- 02U supports these SPI modes: Standard SPI, DIO (Dual I/O), DOUT (Dual Output), QIO (Quad I/O) and QOUT (Quad Output).
Key Benefits
- 2.4 GHz Wi-Fi module
- Tensilica L106 integrated 32-bit RISC processor for ultra-low power consumption and reaches a maximum clock frequency of 160 MHz.
- Support IEEE 802.11 b/g/n standards
- Wi-Fi mode: Station/SoftAP/SoftAP + Station
- Size 18 mm x 20 mm x 2.80 mm
- Operating ambient temperature –40 °C ~ 85 °C
- Green certification RoHS/REACH
