ESPRESSIF ESP32-S2FN4R2

The ESP32-S2 series is a highly integrated, low-power Wi-Fi SoC designed for IoT, mobile devices, wearable electronics, smart home, and a wide range of other applications, delivering excellent low-power and RF performance. The chip features a fully functional Wi-Fi subsystem compliant with IEEE 802.11b/g/n, integrating Wi-Fi MAC, Wi-Fi RF and baseband, antenna switch, RF balun, power amplifier, low-noise amplifier, and more, providing a complete Wi-Fi solution. It is equipped with an Xtensa 32-bit LX7 single-core processor operating at up to 240 MHz, supporting secondary development without the need for an additional MCU or processor. The chip includes 320 KB SRAM and 128 KB ROM, with support for external flash and off-chip RAM via SPI/QSPI/OSPI interfaces. Multiple low-power operating states are supported, and the ULP coprocessor can operate in an ultra-low-power mode to meet the power consumption requirements of various application scenarios. Features such as fine-grained clock gating, dynamic voltage and clock frequency scaling, and adjustable RF power amplifier output enable an optimal balance among communication range, data rate, and power consumption. A rich set of peripheral interfaces is provided, including SPI, I2S, UART, I2C, LED/PWM, LCD interface, Camera interface, ADC, DAC, touch sensor, temperature sensor, and up to 43 GPIOs. A full-speed USB OTG interface is also included to support USB communication. The chip incorporates multiple hardware security mechanisms: hardware crypto accelerators support AES, SHA, and RSA algorithms; RNG, HMAC, and Digital Signature modules provide additional security capabilities; other security features include flash encryption and secure boot signature verification. These comprehensive security mechanisms enable the chip to meet stringent security requirements.

• Wi-Fi:
  • IEEE 802.11b/g/n protocol support
  • 20MHz and 40MHz bandwidth support in the 2.4GHz band
  • Single-band 1T1R mode, data rate up to 150Mbps
  • Wireless Multimedia (WMM)
  • Frame aggregation (TX/RX A-MPDU, RX A-MSDU)
  • Immediate Block ACK
  • Fragmentation & defragmentation
  • Automatic beacon monitoring (hardware TSF)
  • 4× virtual Wi-Fi interfaces
  • Simultaneous support for Infrastructure BSS Station mode / SoftAP mode / Promiscuous mode (on ESP32-S2 series chips, the SoftAP channel changes simultaneously when scanning in Station mode)
  • Antenna diversity
  • 802.11mc FTM
• CPU and Memory:
  • Xtensa 32-bit LX7 single-core processor, clock speed up to 240MHz
  • CoreMark score: single-core 240MHz: 472.73 CoreMark; 1.97 CoreMark/MHz
  • 128KB ROM
  • 320KB SRAM
  • 16KB RTC SRAM
  • Embedded flash and PSRAM (varies by model)
  • SPI/GSPI/OSPI interface for external flash and off-chip RAM
  • Cache-accelerated flash access
  • In-circuit programming (ICP) support for flash
• Advanced Peripheral Interfaces and Sensors:
  • 43× GPIO
  • Digital interfaces:
    • 4× SPI
    • 1× I2S
    • 2× I2C
    • 2× UART
    • 1× RMT (TX/RX)
    • LED PWM controller, up to 8 channels
    • 4× pulse counters
    • 1× full-speed USB OTG
    • 1× DVP 8/16 camera interface, shares hardware resources with I2S
    • 1× LCD interface (8-bit serial RGB/8080/6800), shares hardware resources with SPI2
    • 1× LCD interface (8/16/24-bit parallel), shares hardware resources with I2S
    • DMA controller
    • 1× TWAI controller, compatible with ISO 11898-1 (CAN Specification 2.0)
  • Analog interfaces:
    • 2× 12-bit SAR ADC, up to 20 channels
    • 2× 8-bit DAC
    • 14× capacitive touch GPIO
    • 1× temperature sensor
  • Timers:
    • 1× 64-bit general-purpose timer
    • 1× 64-bit system timer
    • 3× watchdog timers
    • 1× super watchdog timer
    • 1× XTAL32K watchdog timer
• Low-Power Management:
  • Power Management Unit
  • Ultra-low-power coprocessor (ULP):
    • ULP-RISC-V coprocessor
    • ULP-FSM coprocessor
• Security:
  • Secure Boot
  • Flash encryption
  • 4096-bit OTP, up to 1792 bits user-accessible
  • Cryptographic hardware accelerators:
    • AES-128/192/256 (FIPS PUB 197)
    • Hash (FIPS PUB 180-4)
    • RSA
    • Random Number Generator (RNG)
    • HMAC
    • Digital Signature

• General-purpose low-power IoT sensor hub
• General-purpose low-power IoT data logger
• Camera video streaming
• OTT TV box/set-top box devices
• USB devices
• Voice recognition
• Image recognition
• Mesh networking
• Home automation
• Smart lighting
• Smart plugs
• Smart door locks
• Smart buildings
• Lighting control
• Energy consumption monitoring
• Industrial automation
• Industrial wireless control
• Industrial robots
• Smart agriculture
• Smart greenhouse
• Smart irrigation
• Agricultural robots
• Network music player
• Audio streaming devices
• Internet radio
• Health/medical/caregiving
• Health monitoring
• Baby monitor
• Wi-Fi toys
• Remote-controlled toys
• Proximity-sensing toys
• Early education devices
• Wearable electronics
• Smartwatch
• Smart bracelet
• Retail & catering
• POS systems
• Service robots
• Audio devices
• Touch-sensing interaction — waterproof functionality
• Proximity sensing
• Slider and scroll wheel design