ESP-WROOM-02D(M1102H3200PH3Q0) WIFI SMD module, ESP8266EX, 4 MB SPI, 3.3 V, 18 x 20 x 3.2 mm

ESP-WROOM-02D/02U

ESP-WROOM-02D(M1102H1600PH3Q0) SMD Module ESPWROOM-02D, ESP8266EX, 2 MB SPI flash, UART Mode, Internal PCB onboard antenna Dimensions: (18.00 ± 0.10) x (20.00 ± 0.10) x (3.20 ± 0.10)

ESPWROOM-02D(M1102H3200PH3Q0) SMD Module ESPWROOM-02D, ESP8266EX, 4 MB SPI flash, UART Mode, Internal PCB onboard antenna Dimensions: (18.00 ± 0.10) x (20.00 ± 0.10) x (3.20 ± 0.10)

ESP-WROOM-02U(M1102H1600UH3Q0) SMD Module ESP-WROOM-02U, ESP8266EX, 2 MB SPI flash, UART Mode, external IPEX antenna connector Dimensions: (18.00 ± 0.10) x (14.30 ± 0.10) x (3.20 ± 0.10)

ESP-WROOM-02D/ESP-WROOM-02U Specifications: - RF certification: SRRC, FCC, CE (RED), IC, NCC, KCC, TELEC (MIC) - Green certification: RoHS, REACH - Wi-Fi protocols: 802.11 b/g/n - Frequency range: 2.4 GHz ~ 2.5 GHz (2400 MHz ~ 2483.5 MHz) - Peripheral interface: UART/HSPI/I2C/I2S/IR Remote Control, GPIO/PWM - Operating voltag: 2.7 V ~ 3.6 V - Operating current: Average: 80 mA - Minimum current delivered by power supply: 500 mA - Operating temperature range: -40 °C ~ 85 °C - Wi-Fi mode: Station/SoftAP/SoftAP + Station - Security: WPA/WPA2 - Encryption: WEP/TKIP/AES - Firmware upgrade: UART Download/OTA (via network)/Download and write firmware via host - Software development: Supports Cloud Server Development/SDK for custom firmware development - Network protocols: IPv4, TCP/UDP/HTTP/FTP - User configuration: AT Instruction Set, Cloud Server, Android/iOS app

Description: 1. CPU 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.

2. Memory 2.1 Internal SRAM and ROM 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 - There is no programmable ROM in ESP8266EX, therefore, the user program must be stored in an external SPI flash. 2.2 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 2/4-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).

3. Crystal Oscillator ESP-WROOM-02U and ESP-WROOM-02D use a 26-MHz crystal oscillator. The accuracy of the crystal oscillator should be ±10 PPM. When using the download tool, please select the right type of crystal oscillator. In circuit design, capacitors C1 and C2 which connect to the earth are added to the input and output terminals of the crystal oscillator respectively. The values of the two capacitors can be flexible, ranging from 6 pF to 22 pF, however, the specific capacitive values depend on further testing of, and adjustment to, the overall performance of the whole circuit. Normally, the capacitive values of C1 and C2 are within 10 pF for the 26-MHz crystal oscillator.