STMicroelectronics STM32L431CCU7

Overview

STM32L431CCU7 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz and delivering 100 DMIPS. It integrates 256 KB Flash, 64 KB SRAM (16 KB with hardware parity), and rich analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators. It targets battery-powered IoT sensor nodes requiring long runtime, secure firmware execution, and audio-capable edge processing.

For engineers reviewing the STM32L431CCU7 datasheet, STM32L431CCU7 pinout, STM32L431CCU7 application, or STM32L431CCU7 equivalent, key selection criteria include its 8 nA shutdown current, 4 µs wake-up from Stop mode, 21-channel capacitive touch sensing, SAI audio interface, and CAN 2.0B support - all in a compact UFBGA64 (5×5 mm) package with ECOPACK2® compliance.

Technical Context

The device implements FlexPowerControl architecture with seven low-power modes (Shutdown, Standby, Stop 0/1/2, Sleep, Low-power Sleep), enabling sub-µA operation while retaining RTC, backup registers, and selective peripheral wake-up capability. Its ART Accelerator™ enables zero-wait-state execution from Flash at 80 MHz, and the interconnect matrix decouples bus arbitration for deterministic real-time performance.

Clock system includes dual 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 integrated VREFBUF for precision DAC/ADC reference stability.

Key Specifications

Pinout & Package

STM32L431CCU7 is housed in a 64-ball Ultra-Fine Pitch Ball Grid Array (UFBGA64) package measuring 5×5 mm with 0.5 mm ball pitch and ECOPACK2® environmental compliance. The package supports automated optical inspection (AOI) and offers thermal performance suitable for continuous operation in sealed enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power Cortex-M4 MCU applications.

Compared with STM32L431CCU7, STM32L432KCU6 trades peripheral richness for smaller size and lower cost, while STM32L552RET6 shifts focus from analog integration and microamp-level sleep to hardened security - making the L431CCU7 optimal for battery-powered edge devices needing both precision sensing and audio capability.

Availability

STM32L431CCU7 is available at Aetrix Electronics and suitable for smart wearable development, industrial wireless sensor networks, and secure asset tracking systems requiring stable component supply across multi-year production cycles.

Supply support for STM32L431CCU7 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 products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, integrated analog front-ends, and robust security - optimized for battery-operated IoT endpoints and energy-harvesting systems.

FAQ

What is the maximum operating frequency and corresponding performance metric?

The STM32L431CCU7 operates at up to 80 MHz using its Arm Cortex-M4 core with FPU. It achieves 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). These metrics are measured with ART Accelerator™ enabled and Flash execution - confirming deterministic real-time throughput without cache misses.

Does STM32L431CCU7 support hardware cryptographic acceleration?

No, the STM32L431CCU7 does not include dedicated cryptographic accelerators (AES, PKA, HASH). It relies on software libraries for encryption. However, it integrates a NIST SP800-90B-compliant true random number generator (RNG) and memory protection unit (MPU) to support secure firmware updates and runtime isolation - sufficient for basic authentication and key derivation in resource-constrained edge nodes.

Which low-power modes retain RTC functionality and how much current do they draw?

Standby mode with RTC enabled draws 280 nA, and Stop 2 mode with RTC draws 1.0 µA. Both retain the hardware calendar, alarms, and 32×32-bit backup registers powered by VBAT. The RTC remains fully functional - including calibration, tamper detection, and periodic wake-up - making these modes ideal for time-critical, multi-year battery applications.

What are the supported debug interfaces and their physical pin requirements?

The STM32L431CCU7 supports Serial Wire Debug (SWD) using SWDIO and SWCLK pins (B12/B13 in UFBGA64), requiring only two signals plus ground. JTAG is also supported but uses five pins (TMS, TCK, TDI, TDO, TRST). SWD is recommended for space-constrained layouts, and both interfaces support breakpoints, watchpoints, and Embedded Trace Macrocell™ (ETM) streaming for real-time code profiling.