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STMicroelectronics STM32L412CBU6TR
- Part No.:
- STM32L412CBU6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32L412CBU6TR.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,425
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Product details
Overview
STM32L412CBU6TR 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, 40 KB SRAM, and integrated analog peripherals including dual 12-bit ADCs (5 Msps), one operational amplifier with PGA, and one ultra-low-power comparator. It supports external SMPS for optimized efficiency and targets battery-powered IoT sensors, portable medical devices, and energy-harvesting edge nodes.
For engineers reviewing the STM32L412CBU6TR datasheet, STM32L412CBU6TR pinout, STM32L412CBU6TR application, or STM32L412CBU6TR equivalent, key selection criteria include its 28 µA/MHz run-mode current at 3.3 V with SMPS, 4 µs wakeup from Stop mode, RTC with hardware calendar, and LPUART wake-up capability in Stop 2 - all critical for constrained-energy embedded designs.
Technical Context
This MCU implements the Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz. Its FlexPowerControl architecture delivers multiple low-power modes - Shutdown (16 nA), Standby (32 nA), Stop 2 (0.7 µA), and Run (28 µA/MHz with SMPS) - with precise voltage scaling and BOR supervision.
The device integrates independent analog supplies supporting simultaneous high-speed ADC sampling (5 Msps), op-amp signal conditioning, and comparator threshold detection. Clocking includes internal multispeed oscillator auto-trimmed by LSE (±0.25%), USB crystal-less full-speed PHY, and Quad SPI with XIP capability for external memory expansion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP and control algorithms without external co-processor |
| Memory | 128 KB flash (single-bank, code readout protection), 40 KB SRAM (8 KB with parity) - supports secure firmware storage and robust data buffering |
| Power Efficiency | 28 µA/MHz in Run mode with SMPS - reduces battery drain in always-on sensor nodes |
| Low-Power Modes | Stop 2 (0.7 µA), Standby (32 nA), Shutdown (16 nA) - extends multi-year operation on coin-cell batteries |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, 16-bit oversampling), 1 op-amp with PGA, 1 ultra-low-power comparator - enables local signal conditioning and threshold detection |
| Communication | USB 2.0 FS (crystal-less), 3× I²C FM+, 3× USART, 1× LPUART, 2× SPI, Quad SPI - supports mixed wired/wireless connectivity with minimal BOM |
| Timers | 10 timers including 2× low-power 16-bit (active in Stop), 1× advanced motor-control, SysTick - provides precise timing across power states |
Pinout & Package
STM32L412CBU6TR uses the UFQFPN32 (5 × 5 mm) package with 32-pin layout and 0.5 mm pitch, optimized for space-constrained PCBs. All I/Os are 5 V-tolerant except analog pins, simplifying level-shifting in mixed-voltage systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply (1.71–3.6 V) | Supplies digital core and I/Os; supports external SMPS input via VDD12 pin for enhanced efficiency |
| VSS | Digital ground reference | Common return path for digital logic; requires separate analog ground connection for precision ADC/OPAMP operation |
| PA0–PA15, PB0–PB15, PC13–PC15 | General-purpose I/Os | Up to 52 fast I/Os (most 5 V-tolerant); support multiple alternate functions including USB, USART, SPI, and touch sensing |
| VBAT | Backup power supply | Provides 300 nA RTC and 32×32-bit backup register retention during main power loss - enables timekeeping in battery-backed applications |
| NRST | Active-low reset input | Hardware reset trigger with internal pull-up; compatible with open-drain reset supervisors and push-button interfaces |
| BOOT0 | Boot mode selection | Configures boot source (system memory, flash, or SRAM) at power-up; tied low for normal flash execution |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 16 nA Shutdown and 32 nA Standby modes with 4 dedicated wakeup pins - eliminates need for external PMIC in ultra-low-power designs |
| ART Accelerator™ | Delivers 0-wait-state execution from flash at 80 MHz - removes performance penalty of flash latency in real-time control loops |
| Integrated analog subsystem | Dual 12-bit ADCs (5 Msps), OPAMP with PGA, and ultra-low-power comparator share independent supply domain - allows concurrent analog acquisition and processing without digital noise coupling |
| Crystal-less USB 2.0 FS | Eliminates external 48 MHz crystal and associated load capacitors - reduces BOM cost and board area in portable endpoints |
| Quad SPI with XIP | Supports direct code/data execution from external flash - expands effective memory beyond 128 KB without software overhead |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition and local anomaly detection in wrist-worn devices. IC Role / Device Role / Timing Role: Primary controller executing sensor fusion, real-time filtering, and BLE packet preparation; RTC maintains timestamped logs during sleep. Use Value: 28 µA/MHz SMPS-run efficiency and 4 µs Stop-mode wakeup enable sub-10 µA average system current - extending battery life to >2 years on a CR2032 cell. |
Use Scenario: Tamper-resistant electricity meter with metrology, display, and NB-IoT communication. IC Role / Device Role / Timing Role: System-on-chip managing ADC-based shunt/sensor readings, LCD driver, LPUART-to-modem interface, and secure firmware updates. Use Value: Dual 12-bit ADCs (5 Msps) with hardware oversampling achieve Class 0.5 accuracy; 125 °C extended temperature rating ensures reliability in outdoor enclosures. |
| Wireless Sensor Node | Portable Diagnostic Tool |
Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Central processor handling sensor polling, data compression, crypto acceleration (RNG + CRC), and radio interface timing synchronization. Use Value: 32 nA Standby with RTC alarm and LPUART wake-up allows scheduled 15-minute transmissions while maintaining <1 µA average current - enabling 10+ year deployment. |
Use Scenario: Handheld point-of-care device performing rapid blood glucose or lateral flow assay analysis. IC Role / Device Role / Timing Role: Analog front-end controller acquiring optical/chemical sensor signals via OPAMP+ADC chain, applying calibration algorithms, and driving OLED UI. Use Value: Integrated op-amp with programmable gain eliminates discrete signal-conditioning ICs; 40 KB SRAM with parity ensures reliable buffer storage for image-based diagnostics. |
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 |
|---|---|---|---|
| STM32L432KCU6 | Same L4 series, but 256 KB flash, 64 KB SRAM, added AES-256 and SHA-256 crypto accelerators; no Quad SPI | Better suited for secure firmware OTA updates and encrypted sensor data transmission | Select when cryptographic offload and larger code space outweigh Quad SPI requirement |
| STM32L072CZU | Cortex-M0+, lower performance (32 MHz), 192 KB flash, 20 KB RAM, no FPU or ART Accelerator; 380 nA Standby | Targeted at simpler, cost-sensitive applications where DSP or high-speed analog sampling is unnecessary | Choose for basic sensing/control where 100 DMIPS and dual ADCs are over-provisioned |
Compared with STM32L432KCU6, STM32L412CBU6TR trades crypto acceleration and memory for Quad SPI and lower active current; versus STM32L072CZU, it delivers 3× higher compute throughput and richer analog integration at modest cost premium - making it optimal for resource-constrained, analog-intensive edge nodes.
Availability
STM32L412CBU6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, wireless sensor nodes, and portable diagnostic tools requiring stable component supply across multi-year production cycles.
Supply support for STM32L412CBU6TR 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 components for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, integrating advanced power gating, adaptive voltage scaling, and rich analog/mixed-signal peripherals for intelligent edge devices.
FAQ
What is the maximum operating frequency and corresponding performance metric?
The STM32L412CBU6TR operates at up to 80 MHz using the Arm Cortex-M4 core with FPU, delivering 100 DMIPS and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance level supports real-time signal processing, motor control, and secure communication stacks without external coprocessors.
Does this MCU support external SMPS, and how does it affect power consumption?
Yes, STM32L412CBU6TR supports external SMPS via the VDD12 pin, reducing active-mode current to 28 µA/MHz at 3.3 V - a 72% improvement over 79 µA/MHz in LDO mode. This configuration requires proper decoupling and sequencing per Section 3.9.3 of DS12469 Rev 9.
Can the integrated op-amp be used for sensor signal conditioning without external components?
Yes, the single rail-to-rail op-amp includes a programmable gain amplifier (PGA) stage with gains of 1, 2, 4, 8, 16, or 32, enabling direct connection to resistive or capacitive sensors. It operates from the independent VDDA supply and supports unity-gain stable configurations per Section 3.17 of the datasheet.
What debug interfaces are supported, and are they available in all power modes?
Serial wire debug (SWD) and JTAG are supported via dedicated pins (SWCLK, SWDIO, JTCK, JTDI, etc.), with SWD being the recommended interface. Debug access is available in Run, Sleep, and Stop modes but not in Standby or Shutdown - consistent with Arm CoreSight requirements and documented in Section 3.29.1.
STM32L412CBU6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-UFQFN Exposed Pad
- Series:
- STM32L4
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- I2C, Infrared, IrDA, LINbus, QSPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, Temp Sensor, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 40K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b SAR
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L412CBU6TR FAQ
1.How can I place an order for STM32L412CBU6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412CBU6TR 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 STM32L412CBU6TR reliable?
The price and inventory of STM32L412CBU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412CBU6TR is usually 5 days.
3.What payment methods are accepted for STM32L412CBU6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412CBU6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412CBU6TR?
STM32L412CBU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412CBU6TR 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 STM32L412CBU6TR?
For technical support, including STM32L412CBU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412CBU6TR requirements.
6.How does Aetrix verify that STM32L412CBU6TR is sourced from the original manufacturer or authorized distributors?
All STM32L412CBU6TR 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 STM32L412CBU6TR meets industry standards.
7.What is the process for return or replacement of STM32L412CBU6TR?
All STM32L412CBU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412CBU6TR, 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 STM32L412CBU6TR part is unused and in its original packaging.
Return procedure for STM32L412CBU6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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