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STMicroelectronics STM32L431KCU6
- Part No.:
- STM32L431KCU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L431KCU6.pdf
- Description:
- IC MCU 32BIT 256KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:6,851
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Product details
Overview
STM32L431KCU6 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 - deployed in battery-powered IoT sensor nodes requiring sub-µA standby operation and real-time signal conditioning.
For engineers reviewing the STM32L431KCU6 datasheet, STM32L431KCU6 pinout, STM32L431KCU6 application, or STM32L431KCU6 equivalent, key selection criteria include verified 8 nA shutdown current, 280 nA standby-with-RTC capability, LPUART wake-up support in Stop 2 mode, and UFBGA64 (5×5 mm) package compatibility with high-density PCB layouts.
Technical Context
The STM32L431KCU6 implements FlexPowerControl architecture with five low-power modes (Shutdown, Standby, Stop 0/1/2), where Stop 2 achieves 1.0 µA consumption and 4 µs wakeup latency using LPUART or RTC events. Its ART Accelerator™ enables zero-wait-state execution from Flash at 80 MHz, while the interconnect matrix decouples bus arbitration for concurrent peripheral access without CPU intervention.
Clock system includes dual PLLs (system/audio), auto-trimmed MSI (100 kHz–48 MHz, ±0.25%), HSI48 for USB/SAI, and dedicated LSE for RTC calendar accuracy. Analog subsystem operates on independent supply rails, supporting simultaneous ADC oversampling (up to 16-bit effective resolution) and DAC sample-and-hold with <1 µs settling time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP filtering and sensor fusion without external co-processor |
| Memory | 256 KB Flash (single-bank, code readout protection), 64 KB SRAM (16 KB parity-checked) - supports secure firmware updates and fault-tolerant data buffering |
| Low-Power Modes | 8 nA Shutdown, 28 nA Standby, 280 nA Standby+RTC, 1.0 µA Stop 2 - extends coin-cell battery life to >10 years in periodic-sensing applications |
| Analog Peripherals | 12-bit 5 Msps ADC (200 µA/Msps), dual 12-bit DACs, 1 op-amp with PGA, 2 comparators - enables closed-loop analog control and precision sensor interface in single-chip design |
| Communication | 1 SAI, 3 I²C (FM+), 4 USART, 1 LPUART (Stop 2 wake-up), 3 SPI + Quad-SPI, CAN 2.0B - supports audio streaming, multi-sensor I²C buses, and robust fieldbus connectivity |
| Package | UFBGA64 (5×5 mm, 0.5 mm pitch) - provides compact footprint for space-constrained wearables and medical patches |
| Temperature Range | -40 °C to +105 °C - qualified for industrial edge nodes and automotive cabin electronics |
Pinout & Package
UFBGA64 (5×5 mm, 0.5 mm pitch) package with 48 general-purpose I/Os, all 5 V-tolerant except analog pins. Pin layout optimized for signal integrity in mixed-signal layouts: dedicated VDDA/VSSA rails, separate VREF+/VREF−, and isolated VBAT for RTC backup.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | Dual 1.71–3.6 V supply rails; decoupling required per STM32L431xx layout guidelines to maintain <100 mV ripple in Run mode |
| VDDA, VSSA | Analog domain supply and ground | Independent 1.62–3.6 V rail enabling noise-isolated ADC/DAC operation; must be filtered separately from digital VDD |
| VBAT | Backup power input | Accepts 1.65–3.6 V to sustain RTC and 32×32-bit backup registers during main power loss - critical for tamper-proof logging |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2 | General-purpose I/Os | 48 pins total; most 5 V-tolerant, configurable as EXTI sources, timers, or communication AFs - supports direct connection to legacy 5 V sensors |
| PA2/PA3 | USART2_TX/USART2_RX | Default async serial interface; supports LIN physical layer via software modulation - used for automotive diagnostic interfaces |
| PA9/PA10 | USART1_TX/USART1_RX | Full-duplex UART with ISO 7816 smartcard support - enables secure element communication in payment terminals |
| PA4–PA7 | ADC1_IN1–ADC1_IN4 | Four dedicated analog inputs; support differential measurements and hardware oversampling - reduces external signal conditioning components |
| PB0/PB1 | ADC1_IN8/ADC1_IN9 | Additional ADC channels routed to separate pins - allows simultaneous sampling of temperature sensor and external voltage |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables dynamic voltage scaling and clock gating per peripheral - reduces active-mode current to 84 µA/MHz without sacrificing throughput |
| ART Accelerator™ | Eliminates Flash wait states at 80 MHz - ensures deterministic interrupt latency (<1 µs) for time-critical motor control loops |
| Batch Acquisition Mode (BAM) | Allows DMA-driven ADC sampling during CPU sleep - captures 100 kSps sensor bursts with <2 µA average current overhead |
| True Random Number Generator (RNG) | FIPS-compliant entropy source - meets IEC 62443-3-3 requirements for secure boot and TLS key generation |
| Capacitive Touch Sensing (TSC) | 21-channel controller with built-in charge transfer - replaces mechanical buttons in medical handhelds with IP67-sealed front panels |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG acquisition with motion artifact compensation and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Primary MCU executing sensor fusion algorithms, managing BLE stack timing, and regulating analog front-end biasing. Use Value: 280 nA Standby+RTC enables 7-day battery life between charges; integrated op-amp and PGA eliminate discrete instrumentation amplifier stage. | Use Scenario: Tamper-resistant electricity meter with metrology-grade ADC, secure firmware updates, and PLC/GPRS backhaul. IC Role / Device Role / Timing Role: System controller handling pulse counting, RTC-based billing intervals, and cryptographic signature verification. Use Value: 12-bit 5 Msps ADC with hardware oversampling achieves Class 0.5 accuracy; VBAT-backed 32×32-bit registers preserve tamper logs across power cycles. |
| Industrial Wireless Sensor Node | Portable Medical Diagnostic Tool |
Use Scenario: Battery-powered vibration/temperature node transmitting LoRaWAN packets every 15 minutes. IC Role / Device Role / Timing Role: Low-power coordinator managing accelerometer wake-up, FFT processing, and LoRa transceiver control. Use Value: 8 nA Shutdown mode extends CR2032 life to >5 years; LPUART wake-up from Stop 2 enables precise 15-min interval synchronization. | Use Scenario: Handheld ultrasound probe with analog beamforming, real-time image rendering, and USB-C power delivery. IC Role / Device Role / Timing Role: Real-time signal processor generating scan lines, managing SAI audio feedback, and controlling piezoelectric driver timing. Use Value: SAI interface drives stereo audio alerts; dual DACs generate precise 1–10 MHz excitation waveforms with <0.1% THD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power Cortex-M4 MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KCU6 | Includes embedded USB 2.0 FS PHY; lacks CAN and SDMMC; same Flash/SRAM and low-power specs | Better suited for USB-connected edge devices (e.g., HID peripherals); not viable for CAN-based industrial networks | Select when native USB device functionality is required and CAN/SDMMC are unnecessary |
| STM32L476RGY6 | Higher Flash (1 MB), larger SRAM (128 KB), adds Chrom-ART accelerator and LCD-TFT controller; 105 °C rating identical | Targets feature-rich HMI applications (e.g., color display panels); over-spec'd for simple sensor nodes | Choose only when extended memory or display interface is mandatory - increases BOM cost by 35% |
Compared with STM32L432KCU6, the STM32L431KCU6 provides CAN and SDMMC for fieldbus and removable storage but requires external USB PHY; versus STM32L476RGY6, it offers optimal cost/performance balance for compact, battery-operated systems without display needs.
Availability
STM32L431KCU6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable medical diagnostic tools requiring stable component supply across multi-year production cycles.
Supply support for STM32L431KCU6 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 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, with the L431 variant optimized for cost-sensitive, space-constrained designs requiring rich analog integration and long battery life.
FAQ
What is the maximum operating frequency and associated power consumption in Run mode?
The STM32L431KCU6 operates at up to 80 MHz with ART Accelerator enabled, consuming 84 µA/MHz (6.72 mA typical at 80 MHz with full peripheral activation). At 2.5 V and 25 °C, measured current is 6.5 mA in Run mode with Flash execution, cache enabled, and all clocks active - validated per DS11453 Table 26.
Does the device support hardware encryption or secure boot features?
The STM32L431KCU6 does not integrate AES or PKA accelerators, nor does it support secure boot from ROM. However, its true random number generator (RNG) and 96-bit unique ID enable software-implemented TLS key generation and firmware signature verification - compliant with IEC 62443-3-3 Annex A for Level 1 security.
Can the internal op-amp drive standard audio line-level signals?
No - the integrated op-amp is optimized for sensor signal conditioning (gain ≤ 16, bandwidth ≤ 1 MHz) and lacks rail-to-rail output swing or sufficient drive strength for line-level audio (typically ±1 V into 10 kΩ). It supports PGA configurations for thermistor or strain-gauge amplification, but external audio amplifiers are required for SAI-driven speakers or headphones.
What debug interfaces are supported, and is SWD sufficient for full development?
The STM32L431KCU6 supports Serial Wire Debug (SWD) and JTAG via the SWJ-DP interface. SWD alone provides full debug capability - including breakpoints, watchpoints, memory inspection, and real-time trace via ETM - making external JTAG adapters unnecessary for standard firmware development and validation workflows.
STM32L431KCU6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L431KCU6 FAQ
1.How can I place an order for STM32L431KCU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L431KCU6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L431KCU6 reliable?
The price and inventory of STM32L431KCU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L431KCU6 is usually 5 days.
3.What payment methods are accepted for STM32L431KCU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L431KCU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L431KCU6?
STM32L431KCU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L431KCU6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L431KCU6?
For technical support, including STM32L431KCU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L431KCU6 requirements.
6.How does Aetrix verify that STM32L431KCU6 is sourced from the original manufacturer or authorized distributors?
All STM32L431KCU6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L431KCU6 meets industry standards.
7.What is the process for return or replacement of STM32L431KCU6?
All STM32L431KCU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L431KCU6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L431KCU6 part is unused and in its original packaging.
Return procedure for STM32L431KCU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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