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STMicroelectronics STM32L431RCY6TR
- Part No.:
- STM32L431RCY6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-UFBGA, WLCSP
- Datasheet:
-
STM32L431RCY6TR.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 64WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,829
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Product details
Overview
STM32L431RCY6TR 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 sensors, portable medical devices, and energy-harvesting edge nodes requiring sub-µA standby operation and robust mixed-signal capability.
For engineers reviewing the STM32L431RCY6TR datasheet, STM32L431RCY6TR pinout, STM32L431RCY6TR application, or STM32L431RCY6TR equivalent, key selection criteria include its 28 nA Standby mode (with RTC), 4 µs wakeup from Stop mode, UFBGA64 (5×5 mm) package, and support for CAN 2.0B, SAI audio interface, and capacitive touch sensing across 21 channels.
Technical Context
The device implements FlexPowerControl architecture with five low-power modes (Shutdown, Standby, Stop 0/1/2), enabling dynamic voltage scaling and clock gating per peripheral. Its ART Accelerator™ delivers zero-wait-state execution from Flash at 80 MHz, while the interconnect matrix decouples CPU, DMA, and bus masters to sustain throughput under mixed workloads.
On-chip clock system includes dual PLLs (for system/audio/ADC), auto-trimmed MSI (100 kHz–48 MHz, ±0.25%), HSE (4–48 MHz), LSE (32.768 kHz), and HSI48 for USB/SAI timing. Analog subsystem operates on independent supply rails, supporting simultaneous high-speed conversion and low-noise signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS, DSP instructions |
| Memory | 256 KB Flash (single-bank, code readout protection), 64 KB SRAM (16 KB with hardware parity) |
| Low-Power Performance | 28 nA Standby mode (RTC active), 1.0 µA Stop 2 mode, 84 µA/MHz Run mode |
| Analog Peripherals | 1× 12-bit ADC (5 Msps, 16-bit oversampling), 2× 12-bit DACs, 1× op-amp with PGA, 2× ultra-low-power comparators |
| Timers & Control | 11 timers: 1× advanced-control (TIM1), 2× general-purpose (TIM2/TIM15), 2× low-power (LPTIM1/LPTIM2), 2× watchdogs |
| Communication | 1× SAI, 3× I²C (FM+), 4× USART, 1× LPUART, 3× SPI + 1× Quad-SPI, CAN 2.0B, SDMMC, SWPMI, IRTIM |
| Package | UFBGA64 (5 × 5 mm, 0.5 mm pitch, 64-ball array) |
Pinout & Package
STM32L431RCY6TR uses a 64-ball Ultra-Fine Pitch Ball Grid Array (UFBGA64) package with 0.5 mm ball pitch and 5 mm × 5 mm body size, optimized for space-constrained portable designs. Pin functions are defined per STM32L431xx datasheet Section 4 (Pinouts and pin description), with dedicated VDD/VSS pairs per power domain and flexible alternate function mapping across all GPIOs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDIO2 | Main, analog, and I/O power supplies | Independent rails enable noise isolation for ADC/DAC; VDDIO2 supports 5 V-tolerant I/Os up to 83 pins |
| VSS, VSSA, VSSIO2 | Ground references | Dedicated analog ground (VSSA) minimizes coupling into sensitive analog circuits |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15 | General-purpose I/Os | Up to 83 fast I/Os; most support 5 V tolerance, multiple alternate functions (AF0–AF15), and external interrupt capability |
| PC13–PC15 | RTC-related signals | PC13 = RTC_OUT, PC14/PC15 = LSE oscillator pins; critical for calendar, alarm, and calibration functions |
| PA11/PA12 | USB D+/D− | Integrated USB 2.0 FS transceiver (requires HSI48 clock); no external PHY needed |
| PB8/PB9 | I²C1_SCL/I²C1_SDA | Fast-mode Plus (1 Mbit/s) I²C interface with SMBus/PMBus support and analog filtering |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 28 nA Standby with RTC + backup registers, reducing battery drain in always-on sensor nodes |
| ART Accelerator™ | Eliminates Flash wait states at 80 MHz, sustaining 100 DMIPS without external memory or cache complexity |
| Capacitive Touch Sensing (TSC) | 21-channel controller supporting touchkey, linear, and rotary sensors-no external IC required for HMI |
| Batch Acquisition Mode (BAM) | Allows CPU to sleep while peripherals autonomously acquire and pre-process sensor data, cutting active time by >50% |
| True Random Number Generator (RNG) | Fulfills NIST SP800-90B entropy requirements for secure boot and TLS key generation in edge devices |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition with real-time motion artifact cancellation and BLE transmission. IC Role / Device Role / Timing Role: Main controller executing sensor fusion algorithms, managing ultra-low-power ADC/DAC sequencing, and driving SAI-connected audio codec for voice feedback. Use Value: 280 nA Standby with RTC enables multi-year battery life; 12-bit ADC oversampling achieves 16-bit effective resolution for clinical-grade waveform fidelity. | Use Scenario: Tamper-resistant electricity/water meter with pulse counting, LCD display, and NB-IoT modem interface. IC Role / Device Role / Timing Role: System-on-chip managing metrology ADC, real-time tariff calculation, secure firmware updates via LPUART, and tamper-detection GPIOs. Use Value: Integrated CAN 2.0B supports legacy AMI infrastructure; 8 nA Shutdown mode extends CR2032 battery life beyond 10 years in storage. |
| Industrial Predictive Maintenance Sensor | Wireless Audio Endpoint |
Use Scenario: Vibration and temperature monitoring on rotating machinery with local FFT analysis and alert triggering. IC Role / Device Role / Timing Role: Real-time vibration processing unit using DSP instructions, driving LPTIM2-triggered ADC sampling at precise intervals, and storing logs in Flash. Use Value: 4 µs wakeup from Stop mode ensures immediate response to shock events; op-amp + PGA conditions piezo sensor output before digitization. | Use Scenario: Bluetooth LE audio streaming device with digital volume control, equalization, and speaker protection. IC Role / Device Role / Timing Role: Audio subsystem controller interfacing SAI with codec, generating I²S clocks, and managing dual DAC outputs with sample-and-hold for glitch-free playback. Use Value: SAI supports master/slave I²S/TDM with programmable bit clock polarity; dual DACs enable stereo line-out without external DAC IC. |
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 |
|---|---|---|---|
| STM32L433RCT6 | Includes integrated USB-C PD controller and enhanced SAI (dual audio blocks); same Flash/SRAM, identical UFBGA64 package | Required for USB Type-C power negotiation or dual-stream audio (e.g., headset + mic path) | Select when USB-C power delivery or concurrent stereo input/output is mandatory |
| STM32L476RGT6 | Higher Flash (1 MB), larger SRAM (128 KB), adds Chrom-ART accelerator and TFT-LCD controller; LQFP64 package only | Suitable for GUI-driven HMI with local display rendering, not space-constrained battery-only nodes | Choose for feature-rich embedded UIs where board area and power budget allow larger package and higher current draw |
Compared with STM32L431RCY6TR, the STM32L433RCT6 adds USB-C PD and dual SAI at identical power/performance, while the STM32L476RGT6 trades ultra-low-power efficiency for display and memory scalability-making the RCY6TR optimal for minimal-footprint, long-life sensor endpoints.
Availability
STM32L431RCY6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial predictive maintenance sensors, and wireless audio endpoints requiring stable component supply across multi-year production cycles.
Supply support for STM32L431RCY6TR 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, MEMS, and automotive semiconductors with vertical fabrication capability.
The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time performance-designed specifically for IoT edge nodes, portable medical devices, and energy-conscious industrial controls.
FAQ
What is the maximum operating temperature range for STM32L431RCY6TR?
The STM32L431RCY6TR is qualified for industrial operation from –40 °C to +105 °C ambient temperature, as specified in DS11453 Rev 3 Section 6.3.1. This rating applies to all UFBGA64 variants and is validated per JEDEC JESD47 stress testing protocols.
Does STM32L431RCY6TR support hardware encryption acceleration?
No, STM32L431RCY6TR does not integrate a cryptographic processor or AES engine. It relies on software libraries (e.g., Mbed TLS) for encryption; secure boot is implemented via readout protection (RDP) and option byte configuration-not hardware-accelerated crypto.
Can the internal op-amp drive a 10 kΩ load directly?
Yes-the integrated op-amp supports rail-to-rail output swing and can source/sink ±20 mA, enabling direct drive of 10 kΩ loads with <1% gain error at unity gain, as verified in DS11453 Section 6.3.22 (Op-Amp characteristics, Table 67).
Is the UFBGA64 package RoHS and REACH compliant?
Yes, STM32L431RCY6TR's UFBGA64 package meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, and is certified ECOPACK2® compliant per ST's environmental policy documentation (Doc ID 17139).
STM32L431RCY6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-UFBGA, WLCSP
- Series:
- STM32L4
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 52
- 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 16x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L431RCY6TR FAQ
1.How can I place an order for STM32L431RCY6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L431RCY6TR 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 STM32L431RCY6TR reliable?
The price and inventory of STM32L431RCY6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L431RCY6TR is usually 5 days.
3.What payment methods are accepted for STM32L431RCY6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L431RCY6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L431RCY6TR?
STM32L431RCY6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L431RCY6TR 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 STM32L431RCY6TR?
For technical support, including STM32L431RCY6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L431RCY6TR requirements.
6.How does Aetrix verify that STM32L431RCY6TR is sourced from the original manufacturer or authorized distributors?
All STM32L431RCY6TR 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 STM32L431RCY6TR meets industry standards.
7.What is the process for return or replacement of STM32L431RCY6TR?
All STM32L431RCY6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L431RCY6TR, 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 STM32L431RCY6TR part is unused and in its original packaging.
Return procedure for STM32L431RCY6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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