STMicroelectronics — STM32WB55 Wireless Microcontroller

Designers can simplify the circuit design and reduce component count in smart connected devices by taking advantage of the multi-protocol wireless connectivity of the STM32WB55 microcontroller from STMicroelectronics.

The dual-core STM32WB55 includes an embedded ultra low-power radio which complies with the requirements of the Bluetooth® Low Energy specification, the IEEE 802.15.4-2011 standard, Thread®, and the Zigbee 3.0 protocol. It provides full software support for these radio technologies, including a Zigbee PRO protocol stack.

Variants of the STM32WB55 offer a choice of package styles and Flash density from 256 kbytes to 1 Mbyte. The devices feature an Arm® Cortex®-M4 core with floating point unit, DSP instructions, and a memory protection unit to enhance application security. An Arm Cortex-M0+ co-processor dedicated to managing the integrated IEEE 805.15.4 radio and the MCU cyber-protection features ensures real-time low-layer operations run smoothly without compromising application execution.

ST’s patented ultra low-power microcontroller technologies and feature integration, which include the radio balun circuitry, ensure STM32WB55 devices help designers to meet tight power and size constraints in a wide range of IoT and wearable devices. Alongside generous provision of analog and system peripherals, the MCU’s cyber-protection and identity features include secure firmware installation, customer key storage, a hardware public key authority, and cryptographic accelerators.

Controllers for capacitive touch sensing and an LCD display simplify the design of user-interface functionality.

An STM32CubeWB MCU package provides a comprehensive set of embedded software, including low-layer application programming interfaces and hardware abstraction layer drivers for STM32WB microcontrollers. It also includes Bluetooth 5.0, Mesh v1.0, and Thread libraries, a FreeRTOS™ kernel, FatFS file system, and the STMTouch™ capacitive-sensing library.