Module identity and memory budget
The ESP32-S2-WROVER-N4R2 is a surface-mount WiFi module from the ESP32 series, built around the Espressif ESP32-S2 single-core Xtensa LX7 MCU. It integrates 4 MB of flash and 2 MB of PSRAM on-package — the PSRAM provides additional heap space for frame buffers or TLS sessions without an external memory bus.
Wireless link budget
The module supports 802.11b/g/n at 2.4 GHz with a maximum PHY data rate of 150 Mbps. Transmit power is rated at 19.5 dBm, and the receiver sensitivity hits -97 dBm — the link budget at the lowest data rate (1 Mbps DSSS) is roughly 116 dB, meaning a clear line-of-sight range well over 100 m in open air, though enclosure and antenna placement will reduce that. The antenna is a PCB trace — there is no U.FL or IPEX connector on this variant. The board layout must allocate a keep-out zone under the antenna area per Espressif's hardware design guide, or the radiated power drops and the module fails FCC/CE radiated emissions.
Supply rails and current draw
Receive current is 63 mA to 68 mA; transmit current runs 160 mA to 310 mA depending on output power setting and data rate — at the full 19.5 dBm TX power, the peak draw approaches the 310 mA ceiling, which means the 3.3 V rail needs a regulator rated for at least 500 mA to cover the transient when the radio switches from sleep to active TX.
Serial interfaces and peripheral bus
The ESP32-S2 exposes ADC, I²C, I²S, SPI, PWM, and UART serial interfaces. The SPI bus can run at up to 80 MHz for external flash or display controllers; the I²S interface supports audio codec streaming with a dedicated MCLK pin. All GPIOs are 3.3 V tolerant — no level shifting needed for standard 3.3 V peripherals.
Lifecycle and sourcing posture
The ESP32-S2-WROVER-N4R2 carries an NRND (Not Recommended for New Designs) lifecycle status from Espressif.