STMicroelectronics STM32L552CCU6

Overview

STM32L552CCU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 32-bit microcontroller with TrustZone® security, FPU, and SMPS support. It delivers 165 DMIPS at up to 110 MHz, integrates 512 KB Flash (dual-bank read-while-write), 256 KB SRAM (64 KB with hardware parity), and operates from 1.71 V to 3.6 V across –40 °C to 125 °C. It targets secure, battery-constrained edge nodes such as industrial wireless sensors and medical wearables.

For engineers reviewing the STM32L552CCU6 datasheet, STM32L552CCU6 pinout, STM32L552CCU6 application, or STM32L552CCU6 equivalent, key selection criteria include TrustZone-enabled secure boot, sub-100 nA standby current with RTC, dual 12-bit ADCs (5 Msps), integrated SMPS step-down converter, and UFBGA132 package compatibility with high I/O density and low thermal resistance.

Technical Context

The STM32L552CCU6 implements a dual-core security architecture: the Cortex-M33 core executes in both Secure and Non-secure states, enforced by SAU and GTZC peripherals. Its ART Accelerator includes an 8-KB instruction cache enabling zero-wait-state execution from Flash at 110 MHz.

Power management combines three regulators-integrated LDO (configurable output), embedded SMPS step-down converter (62 µA/MHz @ 3 V), and external SMPS support-enabling dynamic voltage scaling and BAM (Batch Acquisition Mode) for sensor data aggregation without CPU wake-up.

Key Specifications

Pinout & Package

STM32L552CCU6 is housed in a 132-ball UFBGA package (7 × 7 mm, 0.5 mm pitch), optimized for compact, thermally efficient PCB layouts in space-constrained applications. The package supports 114 fast I/Os-most 5 V-tolerant-with up to 14 I/Os configurable for independent supply down to 1.08 V.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power secure MCU applications.

Compared with STM32U575ZIT6, the STM32L552CCU6 offers superior ultra-low-power efficiency for infrequent wake-up applications, while RA4M3GFP provides cost-effective M4F performance without hardware TrustZone-making STM32L552CCU6 the optimal balance of security assurance, power efficiency, and peripheral richness for certified edge endpoints.

Availability

STM32L552CCU6 is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, secure medical wearables, smart utility meters, and asset tracking modules requiring stable component supply across extended product lifecycles.

Supply support for STM32L552CCU6 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32L5 series is ST's flagship ultra-low-power secure MCU line, engineered specifically for battery-operated IoT endpoints demanding PSA Certified Level 3 security, sub-100 nA standby, and robust analog integration-all within a scalable ARM Cortex-M33 platform.

FAQ

What is the maximum operating frequency and corresponding power efficiency of STM32L552CCU6?

The STM32L552CCU6 achieves 110 MHz maximum CPU frequency with 165 DMIPS performance. In SMPS step-down converter mode, it consumes 62 µA/MHz at 3 V-significantly lower than the 106 µA/MHz in LDO mode-making it ideal for energy-constrained applications where sustained high-frequency operation is required without compromising battery life.

Does STM32L552CCU6 support hardware-based secure boot and runtime isolation?

Yes. STM32L552CCU6 implements Arm TrustZone for Cortex-M, with a Global TrustZone Controller (GTZC) that enforces secure/non-secure memory and peripheral attribution. It features a unique boot entry, Hide Protection Area (HDP), and Readout Protection (RDP) to ensure immutable, cryptographically verified boot and runtime isolation between secure services and application code.

Which analog peripherals are available and what are their key precision specifications?

The device integrates two 12-bit ADCs capable of 5 Msps sampling, extendable to 16-bit effective resolution via hardware oversampling. It also includes two 12-bit DACs with sample-and-hold, two operational amplifiers with programmable gain, and two ultra-low-power comparators-all supported by independent analog supplies (VDDA/VSSA) to minimize digital noise coupling and ensure ±1 LSB INL stability.

What package options and thermal characteristics apply to STM32L552CCU6?

STM32L552CCU6 is exclusively offered in the UFBGA132 package (7 × 7 mm, 0.5 mm pitch). Its thermal resistance is θ_JA = 30.5 °C/W (JEDEC standard board), enabling reliable operation up to +125 °C ambient when used with moderate copper pour and thermal vias. This package supports 114 I/Os-including 14 with independent VDDIO2-ideal for high-density, thermally constrained PCBs.