Espressif released ESP32-S2 SoC Chipset

Shanghai Lesin Technology ESpressif recently released the latest product of ESP32 family ESP32-S2. The biggest highlight of ESP32-S2 is the support of multiple GPIO, the number of GPIO is 43, while the previous version, namely ESP32-S1, has the maximum of 34 GPIO. The ESP32-S1 is a Xtensa 32-bit LX7 single core processor with a 240 MHz primary frequency, while the ESP32-S1 is a Xtensa 32-bit LX6 single/dual core processor with a 240 MHz primary frequency.

ESP32-S2 features low power 2.4GHz Wi-Fi applications, right! There's only WiFi, and the band is still 2.4GHz, and Bluetooth has been axed. Of course, if there's only 2.4GHz Wi-Fi, we know we already have ESP8266, so why make ESP32-S2?

The ESP32-S2 is an upgrade to the ESP8266, which has a built-in Tensilica L106 32-bit RISC processor with a clock speed of up to 160 MHz. However, the performance of ESP32-S2 is much higher than that of ESP8266.

ESP32-S2 has an on-chip memory resource of 320 KB SRAM, 128 KB ROM, 16 KB RTC memory, and supports external SPIRAM (up to 128 MB) and up to 1 GB of external Flash. Compared to the ESP8266, the storage resources are much looser and can support more complex applications such as the Internet of Things, wearables and smart home.

The main features of ESP32-S2 are listed below:

The CPU and memory

Xtensa® 32-Bit LX7 Single Core Processor

7-level pipeline architecture

Clock frequency up to 240 MHz

Ultra-low power coprocessor

320 KB SRAM, 128 KB ROM, 16 KB RTC memory

Support for External Spiram (128 MB total)

Supports up to 1 GB of external Flash

Separate instruction and data caches

Wi-Fi (Connection)

Support IEEE 802.11b /g/n protocol

1 x 1 send and receive

HT40 support, data rate up to 150 Mbps

Support TCP/IP networking, ESP-Mesh networking and TLS 1.0, TLS 1.1, 2 and other Wi-Fi network protocols

Support TOF ranging for normal Wi-Fi packets

IO peripherals

43 GPIO port

14 capacitive sensing IO

Support SPI, I2C, I2S, UART, ADC/DAC and PWM and other standard peripherals

Support LCD interface (8-bit parallel port RGB, 8080, 6800 interface)

Support 8-/16-bit DVP image sensor interface, the highest clock frequency support to 40 MHz

Support full speed USB OTG


Trusted application boot based on RSA-3072

Flash encryption technology based on AES256-XTS protects sensitive data at rest

4096-bit EFUSE storage, of which 2048 bits are available for applications

Support for digital signature peripherals that can be used for secure storage of private keys and generation of RSA signatures

The optimal power consumption

The ESP32-S2 supports fine-resolution power control by selecting clock frequency, duty cycle, Wi-Fi operation mode, and individual power control for internal components.

When Wi-Fi is enabled, the chip automatically turns the RF transceiver on and off only when needed, reducing the overall power consumption of the system.

At 1% duty cycle current consumption, the no-load mode of the ultra-low power coprocessor is 5 μA and 7 μA, respectively.

Improved power consumption for Wi-Fi connectivity and MCU idle mode.


ESP32-S2 supports LEXIN's software development framework ESP-IDF, which is a mature, production-ready platform. A common cloud connection agent and common product features can significantly reduce time to market.


ESP32-S2 provides a universal Wi-Fi connectivity solution for a variety of applications from consumer to industrial use cases. In addition, its computing power and memory scalability also make it suitable for simple ML-on-edge applications.

ESP32-S2 can support a large number of applications, but the main examples are as follows:

Smart home

The solutions range from the simplest smart lighting, smart door locks and smart sockets to video streaming devices such as white goods, kitchen appliances, OTT devices and security cameras.

Support Mesh network protocol, can be applied to large commercial lighting and smart home network solutions.

It can effectively interact with a variety of sensors to meet the needs of various smart home scenarios.

Battery-powered equipment

Wi-Fi connected sensors, Wi-Fi connected toys, wearable devices and health management devices

The 7 mm Ae 7 mm QFN package is suitable for wearable devices

Ultra-low power operation, less than 5 uA in sleep mode, can be applied to battery-powered devices or devices requiring long periods of standby

QSPI/OPI supports multiple Flash /SRAM chips with flexible configuration of non-volatile and volatile data storage

Industrial automation equipment

Industrial automation equipment applications include wireless control and robotics, intelligent lighting, and HVAC control equipment to ensure high quality technology development and product life cycle.

With excellent radio frequency performance and safety characteristics, can meet the electronic control equipment for reliability, safety and high efficiency of the high standards.

Retail and catering applications

POS machines and service robots

With advanced security performance, can effectively protect the chip and flash sensitive data

Adopt SFF miniaturization design

With 14 very sensitive touch sensors and an LCD interface, the ESP32-S2 is targeted for low-cost, securely connected HMI devices such as POS terminals