The ESP32-S2-WROOM and ESP32-S2-WROOM-I are versatile Wi-Fi MCU modules with powerful features and a wide range of peripheral interfaces, suitable for applications such as wearable electronics and smart home devices. The ESP32-S2-WROOM uses an onboard PCB antenna, while the ESP32-S2-WROOM-I connects to an external antenna via a connector. Both modules are equipped with 4 MB of external SPI flash, and the information in this document applies to both modules. Features CPU and On-chip Memory Built-in ESP32-S2 chip, Xtensa® single-core 32-bit LX7 microprocessor, supporting clock frequencies up to 240 MHz 128 KB ROM 320 KB SRAM 16 KB RTC SRAM Wi-Fi 802.11 b/g/n Data rates up to 150 Mbps in 802.11n mode Frame aggregation (TX/RX A-MPDU, RX A-MSDU) 0.4 µs guard interval Operating channel center frequency range: 2412 ~ 2484 MHz Peripherals GPIO, SPI, UART, I2C, I2S, LCD interface, Camera interface, IR, pulse counter, LED PWM, TWAI® (ISO 11898-1 compliant, i.e., CAN 2.0 specification), full-speed USB OTG, ADC, DAC, touch sensor, temperature sensor*Note: For detailed information on module peripherals, refer to the ESP32-S2 Series Chip Technical Reference Manual. Module Integrated Components 40 MHz integrated crystal oscillator 4 MB SPI flash Antenna Options Onboard PCB antenna (ESP32-S2-WROOM) External antenna via connector (ESP32-S2-WROOM-I) Operating Conditions Operating voltage/power supply voltage: 3.0 ~ 3.6 V Operating temperature: –40 ~ 85°C Certifications RF Certifications: Refer to ESP32-S2-WROOM and ESP32-S2-WROOM-I certificates Environmental Certifications: RoHS/REACH Testing HTOL, HTSL, uHAST, TCT, ESD ESP32-S2-WROOM(-I) Module Comparison Order PN Chip embedded Flash PSRAM Antenna Dimension (mm) ESP32-S2-WROOM (*NRND, not recommended for new designs) ESP32-S2 4 MB — PCB onboard antenna 18 × 31 × 3.3 ESP32-S2-WROOM-I (*NRND, not recommended for new designs) ESP32-S2 4 MB — IPEX external antenna connector 18 × 31 × 3.3 Applications General low-power IoT sensor hub General low-power IoT data logger Camera video streaming OTT TV box/set-top box devices USB devices Voice recognition Image recognition Mesh networks Home automation Smart home control panels Smart buildings Industrial automation Smart agriculture Audio equipment Health/medical/caregiving Wi-Fi toys Wearable electronics Retail & Catering Smart POS applications
