Espressif’s ESP32-H2-WROOM-07 is A Compact RISC-V Based BLE Module for Secure and Low-Power IoT Networks

Espressif has recently introduced the ESP32-H2-WROOM-07, a compact Bluetooth Low Energy (BLE) and IEEE 802.15.4 combo module built around the ESP32-H2 series of SoCs. It features a RISC-V single-core 32-bit microprocessor running at up to 96 MHz, 128 KB of ROM, 320 KB of SRAM, 4 KB of low-power memory, and 2 MB or 4 MB SPI flash storage.

This module is equipped with 3 GPIOs, various interfaces (I2C, SPI, UART, ADC, etc.), and a monopole antenna for wireless communication. Operating within a voltage range of 3.0–3.6 V and a temperature range of -40°C to 105°C, it is ideal for IoT applications such as smart homes, industrial automation, healthcare, and consumer electronics. The key features include support for BLE 5.3 with mesh networking, high-speed and long-range operation, and integrated peripherals for enhanced functionality. It is widely used in applications such as low-power sensor hubs, data logging devices, smart farming solutions, and robotic services.

Measuring just 8.5 × 12.7 × 2.6 mm, the module complies with the IEEE 802.15.4-2015 standard, operating at a 250 Kbps data rate in the 2.4 GHz band. It also features three strapping pins that can be used as GPIOs, along with an integrated 32 MHz crystal oscillator. It supports advanced connectivity protocols like Thread 1.3, Zigbee 3.0, and Matter as well as other application-layer protocols such as HomeKit and MQTT.

Previously, we wrote about the Kaga FIE, a Low-Power BLE wireless module with a RISC-V coprocessor. We have also covered some ESP32-H2 Development kits including the Olimex ESP32-H2-DevKit-LiPo, the waveshare’s ESP32-H2-DEV-KIT-N4, and many more. Feel free to check those out, if you are interested in this topic.

Expressif’s ESP32-H2-WROOM-07 BLE Module Specifications:

• Chip Type: ESP32-H2 SoC
• Architecture: 32-bit RISC-V single-core processor
• Clock Speed: Up to 96 MHz
• Memory:
  • 320 KB SRAM
  • 16 KB Cache
  • 128 KB ROM
  • 4 KB LP memory
• Storage: 2 MB or 4 MB SPI Flash
• Connectivity:
  • Bluetooth 5.3 (LE)
  • IEEE 802.15.4 (for Thread and Zigbee support)
• Security:
  • ECC-based secure boot
  • AES-128/256-XTS flash encryption
  • ECDSA digital signature support
• I/O:
  • 3x GPIOs/3x strapping pins
• Interfaces:
  • ADC, ETM, PCNT, PARLIO
  • SPI, UART, I2C, I2S
  • RMT, GDMA, LED PWM
  • USB Serial/JTAG, TWAI, MCPWM
• Misc:
  • 1x Monopole antenna
  • 32 MHz crystal oscillator
  • temperature sensor
  • general-purpose timers
  • system timer
  • watchdog timer
  • Supports 250 Kbps data rate in 2.4 GHz band and OQPSK PHY
• Power Supply: 3.0–3.6 V
• Dimension: 8.5 × 12.7 × 2.6 mm
• Operating Temperature: –40∼105 °C

Additionally, the ESP32-H2 series offers secure connectivity with features like ECC-based secure boot, AES-128/256-XTS flash encryption, ECDSA digital signatures, an HMAC peripheral for identity protection, and cryptographic accelerators for better performance.

It is fully supported by Espressif’s proven IoT Development Framework (ESP-IDF), allowing customers to leverage their experience with a platform that powers millions of connected devices. Additionally, the ESP32-H2-WROOM-07 supports the production-ready ESP-Zigbee-SDK, enabling the development of reliable, standard home automation devices.

The ESP32-H2-WROOM-07 with 2 MB of Quad SPI flash costs $2.13, while the 4 MB version costs $2.17 on the ESP32 AliExpress store. More Information is available on the company’s official site along with a datasheet and ESP32-H2 DevKits.

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