STMicroelectronics STM32L431CCY6TR

Overview

STM32L431CCY6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 256 KB Flash, 64 KB SRAM, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators. It targets battery-powered IoT sensor nodes, portable medical devices, and smart metering endpoints requiring sub-µA standby operation and RTC-backed data retention.

For engineers reviewing the STM32L431CCY6TR datasheet, STM32L431CCY6TR pinout, STM32L431CCY6TR application, or STM32L431CCY6TR equivalent, key selection criteria include its 28 nA Standby mode (with 5 wakeup pins), 4 µs Stop-mode wakeup, FlexPowerControl architecture, and UFBGA64 (5×5 mm) package with 48 I/Os - all validated for industrial temperature range (–40 °C to +105 °C).

Technical Context

The device 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 (main and low-power), brown-out reset (BOR), and five low-power modes - Shutdown (8 nA), Standby (28 nA), Stop 2 (1.0 µA), and Run (84 µA/MHz) - all managed via hardware-controlled FlexPowerControl logic.

Clock system includes four independent sources: HSE (4–48 MHz), LSE (32.768 kHz), factory-trimmed HSI16 (±1%), and auto-calibrated MSI (100 kHz–48 MHz, ±0.25%). Two PLLs support independent system, audio, and ADC clock domains, while the SAI interface enables synchronous audio streaming without CPU intervention.

Key Specifications

Pinout & Package

STM32L431CCY6TR is housed in a 5 × 5 mm UFBGA64 package with 0.5 mm ball pitch, optimized for space-constrained portable designs. The package supports industrial temperature range (–40 °C to +105 °C) and ECOPACK2® environmental compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433CCY6TR, this part omits USB and crypto but retains identical analog performance and ultra-low-power behavior; versus STM32L412CBU3, it delivers 2× Flash, full timer suite, and expanded communication options - making it optimal for feature-rich, battery-constrained edge devices needing long runtime and rich peripheral integration.

Availability

STM32L431CCY6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic instruments requiring stable component supply across extended product lifecycles.

Supply support for STM32L431CCY6TR 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 solutions for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per µA, combining Cortex-M4 efficiency with ST's proprietary FlexPowerControl and ART Accelerator technologies for energy-constrained edge devices.

FAQ

What is the maximum operating temperature range for STM32L431CCY6TR?

The STM32L431CCY6TR is qualified for industrial temperature operation from –40 °C to +105 °C, as confirmed in Section 6.3.1 of DS11453 Rev 3. This rating applies to all electrical characteristics including Flash programming, RTC operation, and analog peripheral accuracy - verified under continuous thermal stress testing per AEC-Q100 guidelines for industrial use cases.

Does STM32L431CCY6TR support hardware encryption?

No, STM32L431CCY6TR does not integrate hardware cryptographic accelerators such as AES, PKA, or HASH. It relies on software libraries (e.g., Mbed TLS) for encryption tasks. For hardware-accelerated crypto, ST recommends the STM32L433CCY6TR (AES-256, PKA) or STM32L476RG (AES-128, HASH, RNG).

How many I/O pins are available in the UFBGA64 package?

The UFBGA64 package provides 48 general-purpose I/O pins (GPIOs), as documented in Table 15 (pin definitions) and Section 4 (Pinouts and pin description) of DS11453 Rev 3. All 48 pins support alternate functions, and the majority are 5 V-tolerant - enabling direct interfacing with 5 V peripherals without level shifters.

Is the internal 32 kHz RC oscillator accurate enough for RTC calendar operation?

No - the internal low-power 32 kHz RC oscillator has ±5% accuracy and is unsuitable for RTC calendar functions. For hardware calendar accuracy, the device requires the external 32.768 kHz LSE crystal connected to PC14/PC15, which achieves ±20 ppm stability over temperature and ensures reliable date/timekeeping per Section 3.11 and Table 47 of the datasheet.