Single-core WiFi MCU with memory headroom for IoT endpoints
The ESP32-S2-SOLO-2-N4R2 is a single-core WiFi module from the ESP32-S2 series, built around the ESP32-S2R2 chip. It integrates 4MB flash and 2MB PSRAM, giving the application stack room for TLS stacks, OTA update buffers, and local analytics without thrashing the 336kB internal SRAM. WiFi connectivity covers 802.11b/g/n at 2.4GHz with a 150Mbps PHY data rate. The PCB trace antenna keeps the BOM short — no external antenna matching network needed for most layouts. TX power reaches 19.5dBm, which translates to a solid link budget for wall-penetrating IoT sensors or gateways. RX current sits at 71-75mA; TX current ranges from 165mA to 310mA depending on output power setting — the higher end is for the 19.5dBm burst.
Industrial temperature grade and peripheral set
A controller in an outdoor enclosure or a factory-floor sensor sees no derating across the range. Serial interfaces include ADC, GPIO, I2C, I2S, SPI, PWM, UART, and USB. The USB peripheral can serve as a device-side CDC or DFU port for firmware updates without a separate UART-to-USB bridge. Supply voltage is 3V to 3.6V — a single 3.3V rail with a 100mA LDO covers the module's peak draw during TX bursts.
CT works for prototype and low-volume builds.