STMicroelectronics STM32WL55CCU7

Overview

STM32WL55CCU7 from STMicroelectronics is a dual-core 32-bit Arm® Cortex®-M4/M0+ SoC integrating sub-GHz radio (LoRa®, (G)FSK, (G)MSK, BPSK), 256 KB flash, 64 KB SRAM, hardware AES-256 and PKA, operating from 150–960 MHz with RX sensitivity down to –148 dBm (LoRa® SF12) and TX output up to +22 dBm. It targets LPWAN edge nodes in smart metering, asset tracking, and industrial telemetry requiring secure over-the-air firmware updates and ultra-low-power operation.

For engineers reviewing the STM32WL55CCU7 datasheet, STM32WL55CCU7 pinout, STM32WL55CCU7 application, or STM32WL55CCU7 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases for LoRaWAN®/Sigfox™ systems, and confirmed alternative parts with documented functional trade-offs.

Technical Context

The device implements tightly coupled dual-CPU architecture: Cortex-M4 (48 MHz, ART Accelerator, DSP/MPU) handles protocol stack and signal processing, while Cortex-M0+ (48 MHz, MPU) manages radio baseband and low-power state transitions. Inter-processor communication uses IPCC mailboxes and HSEM semaphores.

Its integrated sub-GHz transceiver supports simultaneous modulation schemes via shared RF front-end and programmable IF stages; RF-PLL achieves <100 kHz frequency resolution across 150–960 MHz, with dedicated TX/RX paths enabling concurrent listen-before-talk and packet reception during firmware execution.

Key Specifications

Pinout & Package

STM32WL55CCU7 is housed in a 7 × 7 mm UFQFPN48 package with 0.5 mm pitch, ECOPACK2-compliant, optimized for RF layout integrity and thermal dissipation in compact LPWAN modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core LPWAN SoC applications.

Compared with STM32WL55CCU7, STM32WL54CCU7 sacrifices security and memory headroom for lower unit cost, while ASR6601 trades deterministic radio timing and hardware crypto for higher clock speed and simpler toolchain integration - making STM32WL55CCU7 optimal for mission-critical, long-lifecycle LPWAN endpoints requiring regulatory compliance and field-upgrade resilience.

Availability

STM32WL55CCU7 is available at Aetrix Electronics and suitable for smart utility metering, industrial asset tracking, environmental sensor networks, and smart agriculture monitoring requiring stable component supply across multi-year production programs.

Supply support for STM32WL55CCU7 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and IoT markets.

The STM32WL series was developed specifically to unify MCU processing and sub-GHz radio functionality in a single die, targeting secure, ultra-low-power LPWAN edge devices compliant with LoRaWAN®, Sigfox™, and W-MBus standards.

FAQ

What is the maximum supported LoRa® spreading factor and corresponding RX sensitivity?

The STM32WL55CCU7 achieves –148 dBm RX sensitivity at LoRa® spreading factor 12 with 10.4 kHz bandwidth, as measured per DS13293 Rev 5 Section 5.3.31. This value is guaranteed across the full operating temperature range (–40 °C to +105 °C) and applies to the 868 MHz and 915 MHz ISM bands with standard LoRa® preamble configuration.

Does STM32WL55CCU7 support external TCXO, and what voltage range is configurable?

Yes, the device supports external TCXO via OSC_IN/OSC_OUT pins with programmable supply voltage from 1.6 V to 3.3 V, enabling compatibility with industry-standard 1.8 V, 2.5 V, and 3.3 V TCXOs. This feature is documented in Section 3.13 (RCC) and Table 5.3.9 of the datasheet for precise frequency stability in mobile or temperature-varying deployments.

How many GPIOs are available, and which are 5 V-tolerant?

STM32WL55CCU7 provides up to 43 I/Os in the UFQFPN48 package, with most pins rated for 5 V tolerance when configured in input mode. Pin-specific voltage ratings are defined in Table 20 (STM32WL55/54xx pin definition) and Section 5.3.16 of the datasheet; 5 V tolerance does not apply to analog inputs, RTC-related pins, or RF interface pins.

Can the Cortex-M0+ core operate independently while the M4 core is in deep-sleep mode?

Yes - the M0+ core can execute radio firmware and maintain sub-GHz link activity (e.g., continuous receive, beacon scanning) while the M4 core resides in Stop2 mode (1.07 µA). This is enabled by dedicated low-power peripherals (LPTIM, RTC, IPCC) and documented in Table 10 (MCU and sub-GHz radio operating modes) and Section 3.11 of the datasheet.