STMicroelectronics STM32WB55VCQ6

Overview

STM32WB55VCQ6 from STMicroelectronics is a dual-core, multiprotocol wireless 32-bit MCU integrating an Arm® Cortex®-M4 with FPU (64 MHz) and a dedicated Cortex®-M0+ radio controller. It supports Bluetooth® 5.4 and IEEE 802.15.4 PHY/MAC (Thread 1.3/Zigbee® 3.0), delivers -96 dBm RX sensitivity at 1 Mbps BLE, +6 dBm programmable TX power, and operates from 1.71–3.6 V across -40 °C to 105 °C. It targets secure, ultra-low-power IoT edge nodes such as smart sensors and wireless gateways.

For engineers reviewing the STM32WB55VCQ6 datasheet, STM32WB55VCQ6 pinout, STM32WB55VCQ6 application, or STM32WB55VCQ6 equivalent, key selection criteria include dual-CPU real-time radio coexistence, integrated SMPS for sub-µA standby (600 nA), hardware AES-256/ECDSA/RNG security, and RF regulatory compliance (FCC/ETSI/ARIB).

Technical Context

The device implements a tightly coupled dual-CPU architecture: the Cortex-M4 handles application logic and high-speed peripherals (USB, SAI, QSPI), while the Cortex-M0+ exclusively manages real-time Bluetooth LE and 802.15.4 protocol stacks via IPCC interprocessor messaging. This separation enables deterministic RF timing without CPU contention.

Its RF subsystem integrates a 2.4 GHz transceiver with on-die balun, supports 2 Mbps BLE data rate and advertising extensions, and includes EATT (Enhanced ATT) and GATT caching for reduced latency in connected devices. The embedded SMPS with intelligent bypass mode dynamically optimizes efficiency across active and low-power modes.

Key Specifications

Pinout & Package

STM32WB55VCQ6 is housed in a 48-pin UFQFPN (Ultra Thin Fine Pitch Quad Flat No-lead) package measuring 7 × 7 mm with 0.5 mm pitch. The package supports reflow soldering and provides 72 fast I/Os (70 of which are 5 V-tolerant), including dedicated RF pins (RFIO, RFVSS, RFVDD) and dual crystal oscillator inputs (HSE 32 MHz, LSE 32 kHz).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core wireless MCU applications.

Compared with STM32WB55VCQ6, the RG variant offers scalability in I/O and analog resources within the same ecosystem, while the nRF52840 trades deterministic RF timing and integrated power management for lower unit cost and broader SDK adoption in pure BLE use cases.

Availability

STM32WB55VCQ6 is available at Aetrix Electronics and suitable for industrial sensor networks, smart building controllers, and secure asset tracking systems requiring stable component supply through 2030 and beyond.

Supply support for STM32WB55VCQ6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, and wireless solutions for industrial, automotive, and IoT markets.

The STM32WB series is ST's flagship multiprotocol wireless MCU product line, designed specifically for secure, battery-operated IoT endpoints requiring simultaneous BLE and 802.15.4 connectivity with minimal external components.

FAQ

What wireless certifications does STM32WB55VCQ6 support out-of-the-box?

The STM32WB55VCQ6 is pre-qualified for ETSI EN 300 328 (Europe), FCC CFR47 Part 15.247 (USA), and ARIB STD-T66 (Japan) at the module level when used with ST-recommended matching networks (e.g., MLPF-WB55-02E3). Full end-product certification still requires system-level testing, but RF design effort and risk are significantly reduced.

How does the dual-CPU architecture improve real-time wireless performance?

The Cortex-M0+ core is hardwired to the RF subsystem and executes only the Bluetooth LE and 802.15.4 protocol stacks - isolating timing-critical radio operations from application tasks running on the M4. This eliminates jitter from OS scheduling or interrupt latency, ensuring sub-100 µs response to RF events like packet reception or timer expiration.

Can STM32WB55VCQ6 operate without an external crystal?

No - the device requires both a 32 MHz HSE crystal (for CPU and radio clock) and a 32 kHz LSE crystal (for RTC and low-power timing). Internal RC oscillators (MSI, LSI) are insufficient for BLE/802.15.4 compliance due to frequency stability requirements (<±20 ppm for BLE, <±40 ppm for 802.15.4), and the datasheet explicitly mandates crystal use for RF operation.

What development tools are officially supported for firmware deployment?

ST provides STM32CubeWB firmware package, STM32CubeMX configuration tool, and ST-LINK/V2-1 debugger. Over-the-air (OTA) updates are supported via BLE and 802.15.4 using ST's certified bootloader. Third-party IDEs including Keil MDK, IAR EWARM, and GCC-based toolchains (e.g., PlatformIO) are fully supported with CMSIS-Pack integration.