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STMicroelectronics STM32L451CEU6TR
- Part No.:
- STM32L451CEU6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32L451CEU6TR.pdf
- Description:
- IC MCU 32BIT 512KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,858
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Product details
Overview
STM32L451CEU6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB Flash, 160 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, and hardware-accelerated capacitive touch sensing - deployed in battery-powered IoT sensor nodes requiring long runtime and real-time signal processing.
For engineers reviewing the STM32L451CEU6TR datasheet, STM32L451CEU6TR pinout, STM32L451CEU6TR application, or STM32L451CEU6TR equivalent, key selection criteria include verified low-power mode current (375 nA Standby + RTC), UFBGA64 package compatibility, ART Accelerator™-enabled zero-wait-state Flash execution, and CAN 2.0B interface support for industrial edge devices.
Technical Context
The device implements an Adaptive Real-Time Accelerator (ART Accelerator™) enabling deterministic 0-wait-state execution from Flash at 80 MHz, paired with a memory protection unit (MPU) and interconnect matrix for concurrent peripheral access. Its power architecture supports seven low-power modes - including Stop 2 (2.40 µA with RTC) and VBAT mode (145 nA) - managed via dedicated power control registers and brown-out reset (BOR).
Clock system integration includes dual PLLs (system/audio), auto-trimmed MSI (±0.25%), and independent clock domains for USB (HSI48), RTC (LSE), and ADC (PLLSAI1). Analog subsystem features hardware oversampling (up to 16-bit), built-in PGA op-amp, and buffered 2.048 V reference - all supplied from isolated VDDA rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP algorithms (e.g., FFT-based vibration analysis) without external co-processor |
| Memory | 512 KB Flash (single-bank, code readout protected), 160 KB SRAM (32 KB with parity) - supports secure firmware updates and safety-critical data integrity |
| Low-Power Modes | 375 nA Standby + RTC, 2.40 µA Stop 2 with RTC, 4 µs wakeup - 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 (e.g., precision temperature regulation) |
| Communication | CAN 2.0B, SAI, 4× I²C FM+, 3× USART, LPUART, SDMMC - supports industrial fieldbus connectivity and audio streaming in compact edge nodes |
| Package | UFBGA64 (5×5 mm, 0.5 mm pitch) - enables high-density PCB layouts for space-constrained wearable and metering designs |
| Operating Range | 1.71–3.6 V supply, –40 °C to +125 °C - certified for automotive under-hood and industrial ambient environments |
Pinout & Package
STM32L451CEU6TR uses a 64-ball Ultra-Fine Pitch Ball Grid Array (UFBGA64) package with 0.5 mm ball pitch and 5×5 mm body size, optimized for thermal dissipation and high I/O density in compact portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power/ground | Dual-supply domain: VDD powers digital core & I/O; separate VDDA required for analog peripherals |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2, PH0–PH1 | General-purpose I/O | Up to 83 fast I/Os; most 5 V-tolerant - simplifies level-shifting in mixed-voltage systems |
| NRST | Active-low reset | Asynchronous reset input with internal pull-up; supports external debounced pushbutton or supervisor IC |
| BOOT0 | Boot configuration | High at power-on selects system memory boot (for DFU); tied low for main Flash execution |
| VBAT | Backup power supply | Connects to coin cell to retain RTC calendar and 32×32-bit backup registers during main power loss |
| OSC_IN / OSC_OUT | HSE crystal interface | Supports 4–48 MHz external crystal - used for precise timing in CAN, USB, and audio clock domains |
| LSE_IN / LSE_OUT | RTC crystal interface | 32.768 kHz crystal connection - enables ±1 ppm RTC accuracy for time-stamped sensor logging |
| SWDIO / SWCLK | Debug interface | 2-pin Serial Wire Debug (SWD) - allows full programming, debugging, and trace without JTAG pins |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Seven configurable low-power modes with sub-µA retention - reduces average system current by >95% vs. standard Cortex-M4 in duty-cycled sensing |
| ART Accelerator™ | Zero-wait-state Flash execution at 80 MHz - eliminates instruction cache misses in deterministic real-time control loops |
| Capacitive touch controller (TSC) | 21-channel hardware-accelerated sensing - enables robust touchkey/slider/rotary interfaces without CPU overhead |
| True random number generator (RNG) | NIST SP800-90B compliant entropy source - provides cryptographically secure keys for TLS handshake in constrained IoT nodes |
| Quad SPI interface (QUADSPI) | Direct XIP support for external flash up to 120 MHz - expands code space while maintaining deterministic interrupt latency |
Applications
| Smart Utility Meter | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered electricity/water meter collecting hourly consumption data with tamper detection and RF upload. IC Role / Device Role / Timing Role: Main system controller managing metrology ADC sampling, RTC-based billing intervals, and LPUART wake-up for LPWAN transmission. Use Value: 375 nA Standby + RTC enables >15-year battery life; CAN 2.0B supports legacy AMI infrastructure integration. | Use Scenario: Handheld ECG/SpO₂ device performing real-time waveform acquisition, filtering, and Bluetooth LE alert transmission. IC Role / Device Role / Timing Role: Signal processor running FIR filters on ADC data, driving OLED via SAI, and managing low-power sleep between patient measurements. Use Value: 5 Msps 12-bit ADC with hardware oversampling achieves diagnostic-grade SNR; UFBGA64 enables <25 mm² PCB footprint. |
| Industrial Predictive Maintenance Node | Wireless Sensor Network Gateway |
Use Scenario: Vibration and temperature node mounted on motor housing, performing FFT analysis and sending alerts via CAN or LoRaWAN. IC Role / Device Role / Timing Role: Real-time analytics engine using DSP instructions, interfacing MEMS accelerometer via SPI, and managing CAN bus diagnostics. Use Value: Cortex-M4 FPU executes floating-point FFT in <2 ms; 2.40 µA Stop 2 mode extends maintenance interval reporting to 3+ years per charge. | Use Scenario: Sub-GHz gateway aggregating data from 50+ Zigbee/Z-Wave sensors, buffering locally, and forwarding via Ethernet or cellular. IC Role / Device Role / Timing Role: Protocol bridge with multi-interface concurrency (SAI for audio status, SDMMC for local logging, USB via FS PHY). Use Value: Quad SPI supports 8 MB external flash for OTA firmware storage; 160 KB SRAM enables simultaneous packet buffering across three wireless stacks. |
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 |
|---|---|---|---|
| STM32L431RCY6TR | 320 KB Flash, 64 KB SRAM, no SAI or SDMMC, same UFBGA64 package | Lacks audio interface and external memory support - suitable for cost-sensitive sensor nodes without local storage or voice feedback | Select when BOM cost reduction is critical and advanced peripherals are unused |
| STM32L552RET6 | ARM TrustZone®, 512 KB Flash, 256 KB SRAM, 2.5 µA Stop 2, same pinout-compatible UFBGA64 | Hardware security isolation, higher SRAM, but requires secure boot configuration and increases firmware complexity | Choose for applications requiring PSA Level 1 certification or secure firmware updates |
Compared with STM32L431RCY6TR, the STM32L451CEU6TR adds SAI and SDMMC for edge audio/data buffering; versus STM32L552RET6, it trades TrustZone security for lower power in Stop 2 mode and simpler firmware development.
Availability
STM32L451CEU6TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial predictive maintenance nodes, and wireless sensor network gateways requiring stable component supply across extended product lifecycles.
Supply support for STM32L451CEU6TR 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, designing and manufacturing microcontrollers, power management ICs, and sensors for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with emphasis on battery longevity, real-time responsiveness, and integrated analog functionality for sensor edge processing.
FAQ
What is the maximum operating frequency and corresponding DMIPS rating?
The STM32L451CEU6TR operates at up to 80 MHz with an ARM Cortex-M4 core featuring FPU and ART Accelerator™, delivering 100 DMIPS measured per the Dhrystone 2.1 benchmark. This performance level is sustained with zero wait states from Flash memory due to the integrated prefetch buffer and cache controller.
Does this MCU support hardware cryptographic acceleration?
No, the STM32L451CEU6TR does not include dedicated cryptographic accelerators (e.g., AES, PKA, or HASH engines). It relies on software libraries for encryption; however, its true random number generator (RNG) meets NIST SP800-90B requirements and provides entropy for secure key generation in TLS and firmware signing workflows.
What are the supported debug interfaces and required pins?
The device supports Serial Wire Debug (SWD) using SWDIO and SWCLK pins - requiring only two connections for full programming, breakpoint debugging, and real-time variable monitoring. JTAG is also available but disabled by default; SWD is recommended for minimal pin count and reliable low-power debug access.
How is RTC accuracy maintained during main power loss?
When VBAT is connected to a backup battery or supercapacitor, the RTC continues running with hardware calendar and alarm functions active. The 32.768 kHz LSE crystal ensures ±1 ppm timing accuracy, and the 32×32-bit backup register block retains calibration data and timestamps - enabling precise timekeeping across power cycles without host intervention.
STM32L451CEU6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-UFQFN Exposed Pad
- 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, QSPI, SAI, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 512KB (512K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 160K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b; D/A 1x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L451CEU6TR FAQ
1.How can I place an order for STM32L451CEU6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L451CEU6TR 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 STM32L451CEU6TR reliable?
The price and inventory of STM32L451CEU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L451CEU6TR is usually 5 days.
3.What payment methods are accepted for STM32L451CEU6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L451CEU6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L451CEU6TR?
STM32L451CEU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L451CEU6TR 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 STM32L451CEU6TR?
For technical support, including STM32L451CEU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L451CEU6TR requirements.
6.How does Aetrix verify that STM32L451CEU6TR is sourced from the original manufacturer or authorized distributors?
All STM32L451CEU6TR 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 STM32L451CEU6TR meets industry standards.
7.What is the process for return or replacement of STM32L451CEU6TR?
All STM32L451CEU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L451CEU6TR, 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 STM32L451CEU6TR part is unused and in its original packaging.
Return procedure for STM32L451CEU6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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