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STMicroelectronics STM32L431CBU6
- Part No.:
- STM32L431CBU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32L431CBU6.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,216
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Product details
Overview
STM32L431CBU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 128 KB Flash, 64 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, and an operational amplifier with PGA. It supports 5 V-tolerant I/Os and delivers 84 µA/MHz in run mode, targeting battery-powered IoT sensor nodes, portable medical devices, and energy-harvesting systems.
For engineers reviewing the STM32L431CBU6 datasheet, STM32L431CBU6 pinout, STM32L431CBU6 application, or STM32L431CBU6 equivalent, key selection considerations include its 80 MHz Cortex-M4+FPU core, 128 KB Flash/64 KB SRAM memory configuration, UFBGA64 (5×5 mm) package with 48 I/Os, ultra-low-power modes down to 8 nA shutdown, and integrated analog signal chain for sensor interface and control.
Technical Context
The STM32L431CBU6 implements an Arm Cortex-M4 core with hardware FPU and Adaptive Real-Time Accelerator (ART™) enabling zero-wait-state execution from Flash at 80 MHz. Its FlexPowerControl architecture integrates multiple low-power modes-including Shutdown (8 nA), Standby (28 nA), and Stop 2 (1.0 µA)-with fast 4 µs wakeup and dedicated LPUART/SPI/LPTIM wake sources.
Analog subsystem includes one 12-bit ADC (5 Msps, hardware oversampling up to 16-bit), two 12-bit DACs with sample-and-hold, one rail-to-rail op-amp with programmable gain amplifier (PGA), and two ultra-low-power comparators-all supported by independent analog supply domains and internal voltage references (VREFINT, VREFBUF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS performance |
| Memory | 128 KB Flash (single bank, code readout protection), 64 KB SRAM (16 KB with parity) |
| Power Consumption | 8 nA in Shutdown mode; 1.0 µA in Stop 2 mode with RTC active |
| Analog Peripherals | 1× 12-bit 5 Msps ADC (16-bit via oversampling), 2× 12-bit DACs, 1× op-amp with PGA, 2× comparators |
| Timers | 11 timers: 1× advanced-control (TIM1), 1× 32-bit + 2× 16-bit general-purpose, 2× low-power (LPTIM1/2), 2× watchdogs |
| Communication | 3× I²C (FM+), 4× USART (incl. LIN/IR/ISO7816), 1× LPUART, 3× SPI, 1× SAI, CAN 2.0B, SDMMC, SWPMI |
| I/O Count | 48 GPIOs (most 5 V-tolerant), with capacitive touch sensing on up to 21 channels |
Pinout & Package
STM32L431CBU6 uses a 64-pin Ultra-Fine Pitch Ball Grid Array (UFBGA64) package measuring 5 mm × 5 mm with 0.5 mm pitch, optimized for space-constrained portable and wearable applications. The package supports full I/O functionality including analog inputs, timer channels, and communication interfaces while maintaining thermal efficiency and mechanical robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | Core and I/O domain supply (1.71–3.6 V); separate VDDA/VSSA required for analog operation |
| VBAT | Backup power input | Supplies RTC and 32×32-bit backup registers during main power loss (200 nA retention current) |
| PA0–PA15, PB0–PB15, PC0–PC15, PD2, PF9–PF15 | General-purpose I/Os | 48 configurable pins; most support 5 V tolerance, alternate functions, and capacitive sensing |
| NRST | Active-low reset input | Asynchronous external reset with internal pull-up; supports reset generation from WWDG/IWDG |
| BOOT0 | Boot mode selection | High at power-on selects system memory boot; used for factory bootloader or DFU entry |
| SWCLK, SWDIO | Serial Wire Debug interface | 2-pin debug port supporting programming, real-time trace, and breakpoints without JTAG pins |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 8 nA shutdown and 28 nA standby with 5 wakeup pins-critical for multi-year battery life in remote sensors |
| ART Accelerator™ | Eliminates Flash wait states at 80 MHz, delivering deterministic 100 DMIPS performance without SRAM code relocation |
| Dual 12-bit DACs with sample-and-hold | Supports simultaneous analog waveform generation and precise DC bias control in closed-loop systems |
| Op-amp with integrated PGA | Configurable gain (1–16×) enables direct connection to low-output sensors (e.g., thermopiles, strain gauges) without external amplification |
| Capacitive touch sensing (TSC) | 21-channel hardware-accelerated touch controller supports touchkey, linear, and rotary sensors with <1 µA active current |
Applications
| Wearable Health Monitor | Smart Gas Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG acquisition and local preprocessing in wrist-worn device powered by coin cell. IC Role / Device Role / Timing Role: Primary MCU executing sensor fusion algorithms, driving OLED display via SPI, and managing BLE connectivity through UART. Use Value: 1.0 µA Stop 2 mode extends battery life >2 years; integrated op-amp and ADC enable direct analog front-end conditioning without external components. | Use Scenario: Battery-operated CO/NH₃ detector using electrochemical sensors with temperature compensation. IC Role / Device Role / Timing Role: Signal conditioner (PGA + ADC), environmental compensator (internal temp sensor + VREFINT), and LoRaWAN packet builder. Use Value: 280 nA Standby with RTC allows hourly wake-up for measurement; dual DACs generate precise reference voltages for sensor biasing. |
| Industrial Predictive Maintenance Sensor | Energy-Harvesting Wireless Switch |
Use Scenario: Vibration and temperature monitoring on rotating machinery using piezoelectric and NTC sensors. IC Role / Device Role / Timing Role: Real-time FFT engine (Cortex-M4+FPU), event-triggered data logging to QuadSPI flash, and CAN 2.0B gateway to PLC. Use Value: 84 µA/MHz run efficiency minimizes energy per FFT cycle; CAN interface enables direct integration into existing industrial networks. | Use Scenario: Self-powered wall switch harvesting energy from button press via piezoelectric transducer. IC Role / Device Role / Timing Role: Ultra-low-power state manager, wake-on-interrupt controller, and BLE advertiser using LPUART-triggered wakeup. Use Value: 4 µs wakeup from Stop mode ensures sub-millisecond response to mechanical actuation; 8 nA shutdown preserves harvested microjoules between events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L431RCT6 | LQFP64 package (10×10 mm), 256 KB Flash, 48 I/Os, same peripheral set | Better suited for prototyping and manual soldering; larger footprint limits miniaturization | Select when board layout flexibility or reworkability outweighs size constraints |
| STM32L411RET6 | No FPU, no SAI, no op-amp, 160 KB Flash, 32 KB SRAM, lower max clock (80 MHz but no ART boost) | Lower cost for simpler sensor nodes without audio or precision analog requirements | Choose when DSP math or analog signal chain complexity is minimal |
Compared with STM32L431RCT6, the CBU6 offers identical functionality in a 5×5 mm UFBGA-critical for wearables-while STM32L411RET6 sacrifices FPU, op-amp, and SAI to reduce BOM cost where those features are unused.
Availability
STM32L431CBU6 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical devices, and energy-harvesting wireless switches requiring stable component supply across multi-year production cycles.
Supply support for STM32L431CBU6 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-microwatt, combining Cortex-M4+FPU compute capability with flexible power management and rich analog integration for intelligent edge devices.
FAQ
What is the maximum operating frequency and corresponding performance of the STM32L431CBU6?
The STM32L431CBU6 operates at up to 80 MHz using its Arm Cortex-M4 core with FPU, achieving 100 DMIPS and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance is sustained with zero wait states via the ART Accelerator™ when executing from Flash, and includes full DSP instruction support for filtering and control algorithms.
Does the STM32L431CBU6 support hardware cryptographic acceleration?
No, the STM32L431CBU6 does not include dedicated hardware crypto accelerators (e.g., AES, SHA, PKA). It relies on software libraries for cryptographic operations. For hardware-accelerated security, ST's STM32L5 or STM32U5 series are recommended alternatives with integrated cryptographic processors and secure boot.
What are the supported low-power modes and their typical current consumption?
The STM32L431CBU6 supports Shutdown (8 nA), Standby (28 nA), Standby with RTC (280 nA), Stop 2 (1.0 µA), and Stop 1 (1.28 µA with RTC). All modes retain SRAM and register content except Shutdown. Wakeup latency ranges from 4 µs (Stop) to 15 µs (Standby), with five dedicated wakeup pins available in Shutdown and Standby.
Can the integrated op-amp be used in standalone mode without external components?
Yes-the integrated rail-to-rail op-amp supports standalone use with programmable gain (1× to 16×) via internal PGA. It operates from 1.8 V to 3.6 V, draws 60 µA typical, and supports unity-gain buffer, non-inverting amplifier, and comparator configurations without external resistors, enabling compact analog front-ends for sensor signal conditioning.
STM32L431CBU6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-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:
- 39
- Program Memory Size:
- 128KB (128K 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:
STM32L431CBU6 FAQ
1.How can I place an order for STM32L431CBU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L431CBU6 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 STM32L431CBU6 reliable?
The price and inventory of STM32L431CBU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L431CBU6 is usually 5 days.
3.What payment methods are accepted for STM32L431CBU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L431CBU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L431CBU6?
STM32L431CBU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L431CBU6 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 STM32L431CBU6?
For technical support, including STM32L431CBU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L431CBU6 requirements.
6.How does Aetrix verify that STM32L431CBU6 is sourced from the original manufacturer or authorized distributors?
All STM32L431CBU6 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 STM32L431CBU6 meets industry standards.
7.What is the process for return or replacement of STM32L431CBU6?
All STM32L431CBU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L431CBU6, 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 STM32L431CBU6 part is unused and in its original packaging.
Return procedure for STM32L431CBU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L431CBU6 Tags
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