STMicroelectronics STM32L451CCU6

Overview

STM32L451CCU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB Flash, 160 KB SRAM, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, and RTC with hardware calendar-used in battery-powered IoT sensor nodes requiring long runtime and precision signal acquisition.

For engineers reviewing the STM32L451CCU6 datasheet, STM32L451CCU6 pinout, STM32L451CCU6 application, or STM32L451CCU6 equivalent, key selection factors include verified low-power mode current (375 nA Standby + RTC), 5 V-tolerant I/O count (up to 83), UFBGA64 package footprint, CAN 2.0B interface support, and SAI audio interface capability for edge voice processing.

Technical Context

The STM32L451CCU6 implements an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, paired with a Memory Protection Unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture integrates dual voltage regulators supporting dynamic voltage scaling across six low-power modes-including Stop 2 (2.40 µA with RTC) and Shutdown (22 nA).

Clock system includes two PLLs (system/audio), auto-trimmed MSI (100 kHz–48 MHz, ±0.25%), HSE (4–48 MHz), LSE (32.768 kHz), and HSI48 for USB/SAI clock recovery. Analog subsystem features independent supply domains, hardware oversampling (up to 16-bit), and buffered 2.048 V/2.5 V reference outputs.

Key Specifications

Pinout & Package

STM32L451CCU6 uses a 64-pin Ultra-Fine Pitch Ball Grid Array (UFBGA64) package with 0.4 mm ball pitch and 5 mm × 5 mm body size, optimized for space-constrained portable and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KCU6, the STM32L451CCU6 adds SAI and Quad-SPI for audio and external memory-critical for edge AI preprocessing. Versus STM32L552RET6, it trades TrustZone security for smaller UFBGA64 packaging and lower cost, making it optimal for volume consumer IoT with moderate security needs.

Availability

STM32L451CCU6 is available at Aetrix Electronics and suitable for smart metering, wearable health monitoring, industrial wireless sensor nodes, and audio edge gateways requiring stable component supply across multi-year production cycles.

Supply support for STM32L451CCU6 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 STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time performance-optimized for IoT endpoints, portable medical devices, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and corresponding performance metric of the STM32L451CCU6?

The STM32L451CCU6 operates at up to 80 MHz, delivering 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance is sustained with zero wait states via the ART Accelerator™, confirmed in DS11910 Rev 5 Section 3.2, and validated under 1.71–3.6 V supply with ambient temperature up to +85°C.

Does the STM32L451CCU6 support 5 V-tolerant I/Os, and how many pins are available?

Yes, STM32L451CCU6 supports 5 V-tolerant I/Os on most of its 83 GPIOs, as specified in Section 6.3.14 of DS11910 Rev 5. This capability allows direct interfacing with legacy 5 V peripherals without level shifters-critical for industrial sensor integration and backward-compatible design reuse.

What are the lowest achievable current consumption values in standby and shutdown modes?

In Shutdown mode, current is 22 nA (5 wakeup pins); in Standby mode with RTC enabled, it is 375 nA-both measured at VDD = 3.3 V, TA = 25°C, per Table 4 and Section 6.3.4 of DS11910 Rev 5. These values are production-validated and include RTC oscillator and backup register retention.

Which communication interfaces support audio-class timing and synchronization?

The SAI (Serial Audio Interface) supports I²S, PCM, and AC97 protocols with dedicated MCLK, FS, SCK, and SD lines, plus DMA-triggered double-buffering. It is explicitly designed for audio-class timing, with jitter performance validated for 44.1/48 kHz sampling-detailed in Section 3.29 and Table 14 of DS11910 Rev 5.