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STMicroelectronics STM32L412CBU6
- Part No.:
- STM32L412CBU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32L412CBU6.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,146
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Product details
Overview
STM32L412CBU6 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 - deployed in battery-powered IoT sensors and portable medical monitors.
For engineers reviewing the STM32L412CBU6 datasheet, STM32L412CBU6 pinout, STM32L412CBU6 application, or STM32L412CBU6 equivalent, key selection criteria include verified low-power mode current (245 nA Standby + RTC), SMPS-compatible voltage regulation (1.71–3.6 V), USB 2.0 full-speed crystal-less operation, and LQFP32 package compatibility for space-constrained embedded designs.
Technical Context
The STM32L412CBU6 implements an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, paired with a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture supports dual supply schemes: internal LDO or external SMPS (VDD12 = 1.0–1.1 V), delivering 28 µA/MHz in SMPS-run mode.
It integrates a hardware calendar RTC with calibration, batch acquisition mode (BAM) for sensor data aggregation, and true random number generation (TRNG) compliant with NIST SP800-90B. The analog subsystem operates on an independent supply rail, isolating noise-sensitive measurements from digital switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and DSP instructions; enables real-time signal processing in edge AI inference nodes. |
| Max Clock Frequency | 80 MHz; delivers 100 DMIPS and 273.55 CoreMark® for responsive human-interface firmware. |
| Flash / SRAM | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB parity-checked) for secure firmware and buffer storage. |
| Low-Power Modes | 245 nA Standby + RTC; 79 µA/MHz (LDO), 28 µA/MHz (SMPS); extends coin-cell battery life to >10 years in metering applications. |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, 16-bit oversampling), 1 op-amp with PGA, 1 comparator; supports precision biopotential sensing without external signal conditioning. |
| Communication | USB 2.0 FS crystal-less, 3× I²C FM+, 3× USART, 1× LPUART, 2× SPI, Quad-SPI XIP; enables direct firmware updates and sensor hub connectivity. |
| Package | UFQFPN32 (5 × 5 mm, 0.5 mm pitch); compatible with automated optical inspection and reflow profiles for high-yield SMT assembly. |
Pinout & Package
STM32L412CBU6 is housed in a 32-pin UFQFPN (5 × 5 mm) package with exposed thermal pad, rated for industrial temperature range (–40 °C to +85 °C). Pin functions are validated per STMicroelectronics datasheet DS12469 Rev 9, Section 4 ("Pinouts and pin description").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | Supports dual-regulator operation: internal LDO or external SMPS (VDD12); decoupling critical for ADC/RTC stability. |
| VBAT | Backup power supply | Supplies RTC and 32×32-bit backup registers at 300 nA; enables timekeeping during main power loss. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD2 | General-purpose I/Os | Up to 52 fast I/Os (most 5 V-tolerant); configurable as GPIO, EXTI, or AF for USB/I²C/SPI/USART peripherals. |
| PA13/PA14 | SWD debug interface | Serial Wire Debug (SWD) pins; enable non-intrusive firmware debugging and programming without JTAG overhead. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external push-button or supervisor IC integration. |
| USB_DP/USB_DM | USB 2.0 full-speed differential pair | Crystal-less operation enabled via internal 48 MHz clock recovery; eliminates external oscillator BOM cost and layout area. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 7 low-power modes (Shutdown to Run) with sub-µA retention states - critical for energy-harvesting sensor nodes. |
| ART Accelerator™ | Eliminates flash wait states at 80 MHz, reducing code execution latency and dynamic power in interrupt-driven firmware. |
| Independent analog supply (VDDA) | Isolates ADC/OPAMP/COMP from digital noise; ensures <±1 LSB INL across temperature for medical-grade measurements. |
| Hardware CRC & 96-bit UID | Enables firmware integrity verification and device-specific cryptographic key derivation for secure boot and OTA updates. |
| TSC (Touch Sensing Controller) | Supports 12 capacitive sensing channels for touchkey/rotary interfaces - replaces mechanical buttons in wearable UIs. |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition powered by CR2032 battery. IC Role / Device Role / Timing Role: Main controller executing sensor fusion, real-time filtering, and BLE packet formatting; RTC maintains timestamped logs. Use Value: 245 nA Standby + RTC and 28 µA/MHz SMPS-run mode extend battery life beyond 36 months without replacement. |
Use Scenario: Tamper-resistant electricity/water meter with pulse counting and wireless reporting. IC Role / Device Role / Timing Role: System-on-chip managing metrology ADC, EEPROM logging, and NB-IoT modem interface; LPUART wakes CPU from Stop 2 on command. Use Value: Dual 12-bit ADCs with hardware oversampling achieve Class 0.5 accuracy; 32 nA Standby mode meets IEC 62053-21 long-term storage requirements. |
| Industrial Wireless Sensor Node | Portable Diagnostic Device |
Use Scenario: Battery-operated vibration/temperature node transmitting via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Data aggregator with BAM-enabled ADC sampling, crypto acceleration (RNG + CRC), and low-power timer scheduling. Use Value: Batch Acquisition Mode reduces CPU wakeups by 80%, cutting average current to <1.2 µA in duty-cycled operation. |
Use Scenario: Handheld point-of-care analyzer performing rapid blood glucose or lactate assays. IC Role / Device Role / Timing Role: Analog front-end controller driving electrochemical sensor bias, measuring current via OPAMP+ADC, and displaying results on segment LCD. Use Value: Integrated op-amp with programmable gain eliminates discrete instrumentation amplifier, shrinking BOM by 3 components and PCB area by 22 mm². |
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 | 64 KB flash, 16 KB SRAM, same core/peripherals but no Quad-SPI; includes AES-256 and SHA-256 accelerators. | Better suited for secure firmware update and encrypted sensor data transmission. | Select when cryptographic offload is required and flash footprint is constrained. |
| STM32L452RET6 | 512 KB flash, 160 KB SRAM, adds SDMMC, more timers, higher pin count (LQFP64); 3.3 V only (no SMPS support). | Targeted at feature-rich HMI or gateway-class devices requiring local data buffering and display control. | Choose when larger code space, extended connectivity, or higher I/O density outweighs ultra-low-power optimization. |
Compared with STM32L432KCU6, the STM32L412CBU6 offers 2× flash and integrated SMPS control for deeper power savings; versus STM32L452RET6, it trades memory and peripherals for 3.5× lower Standby current and smaller 5×5 mm footprint - prioritizing longevity and miniaturization over scalability.
Availability
STM32L412CBU6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across multi-year production cycles.
Supply support for STM32L412CBU6 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, and MEMS 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, analog integration, and security features for IoT edge devices.
FAQ
Does STM32L412CBU6 support external SMPS control, and how is it implemented?
Yes - the STM32L412CBU6 includes dedicated SMPS control logic (VDD12 regulator interface) that drives an external DC-DC converter via VDD12 and VDD12_SENSE pins. It supports automatic voltage scaling transitions between 1.0 V and 1.1 V, achieving 28 µA/MHz run-mode current. Configuration is handled through PWR_CR3 register bits (ENSMPS, VOS).
What is the maximum achievable resolution of the ADC when using hardware oversampling?
The dual 12-bit ADCs support hardware oversampling up to 16-bit effective resolution (65,536 levels) with configurable oversampling ratio (2× to 256×) and data shift. At 256× oversampling, the effective sampling rate drops to ~19.5 kSPS, maintaining ±1 LSB INL under specified conditions per DS12469 Table 6.3.18.
Can the integrated op-amp be used in transimpedance configuration for photodiode current measurement?
Yes - the single rail-to-rail op-amp supports programmable gain (1× to 40× via internal PGA) and can be configured as a transimpedance amplifier. Its input offset voltage (±1.5 mV max) and bias current (1 pA typ.) enable sub-nA photocurrent detection when paired with appropriate feedback resistors and shielding per AN4913 guidelines.
Is USB crystal-less operation supported across all temperature and voltage ranges?
Yes - the internal 48 MHz clock recovery system (CRS) synchronizes to the USB SOF token, enabling crystal-less USB 2.0 full-speed operation from –40 °C to +85 °C and 1.71–3.6 V supply. Startup time is <1 ms, and jitter remains within USB specification limits per DS12469 Section 3.26 and Table 6.3.24.
STM32L412CBU6 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:
- I2C, Infrared, IrDA, LINbus, Quad SPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, 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
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L412CBU6 FAQ
1.How can I place an order for STM32L412CBU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412CBU6 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 STM32L412CBU6 reliable?
The price and inventory of STM32L412CBU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412CBU6 is usually 5 days.
3.What payment methods are accepted for STM32L412CBU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412CBU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412CBU6?
STM32L412CBU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412CBU6 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 STM32L412CBU6?
For technical support, including STM32L412CBU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412CBU6 requirements.
6.How does Aetrix verify that STM32L412CBU6 is sourced from the original manufacturer or authorized distributors?
All STM32L412CBU6 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 STM32L412CBU6 meets industry standards.
7.What is the process for return or replacement of STM32L412CBU6?
All STM32L412CBU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412CBU6, 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 STM32L412CBU6 part is unused and in its original packaging.
Return procedure for STM32L412CBU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L412CBU6 Tags
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