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STMicroelectronics STM32L412CBU6P
- Part No.:
- STM32L412CBU6P
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32L412CBU6P.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,706
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Product details
Overview
STM32L412CBU6P 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 sensor nodes, portable medical devices, and energy-harvesting systems requiring sub-µA standby operation.
For engineers reviewing the STM32L412CBU6P datasheet, STM32L412CBU6P pinout, STM32L412CBU6P application, or STM32L412CBU6P equivalent, key selection criteria include verified 28 µA/MHz run-mode current at 3.3 V with SMPS, 245 nA Standby + RTC, 4 µs wakeup from Stop mode, and UFBGA64 (5×5 mm) package compatibility with capacitive touch sensing and USB 2.0 full-speed crystal-less interface.
Technical Context
The device implements an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash memory, critical for deterministic real-time response in low-power firmware. Its FlexPowerControl architecture integrates multiple voltage regulator modes (LDO/SMPS), dynamic voltage scaling, and five low-power modes - Shutdown (16 nA), Standby (245 nA with RTC), Stop 2 (0.7 µA), and Run (28 µA/MHz with SMPS) - all validated across –40 °C to 125 °C.
Peripherals are routed via an interconnect matrix supporting concurrent high-bandwidth access to flash, SRAM, and DMA. Clock system includes factory-trimmed 16 MHz RC (±1%), auto-calibrated multispeed oscillator (±0.25%), 4–48 MHz external crystal, and PLL for system clock generation - all synchronized with hardware calendar RTC, LPUART wake-up capability, and true random number generator for secure boot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and DSP instructions, 80 MHz max frequency (100 DMIPS) |
| Flash / SRAM | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB with hardware parity) |
| Power Consumption | 28 µA/MHz in Run mode with SMPS @3.3 V; 245 nA in Standby + RTC |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, 16-bit oversampling); 1 op-amp with PGA; 1 ultra-low-power comparator |
| Communication | USB 2.0 FS crystal-less; 3× I²C FM+; 3× USART; 1× LPUART; 2× SPI; 1× Quad SPI; IRTIM |
| Timers & Control | 10 timers: 1× advanced-control (TIM1), 2× general-purpose 16/32-bit, 2× low-power (LPTIM1/2), 2× watchdogs |
| Package | UFBGA64 (5 × 5 mm, 0.5 mm pitch), ECOPACK2-compliant |
Pinout & Package
STM32L412CBU6P uses a 64-ball UFBGA package (5 × 5 mm, 0.5 mm pitch) with 52 fast I/Os - most 5 V-tolerant - and dedicated power/ground ball layout optimized for low-noise analog performance and thermal dissipation in compact PCB designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDIO2 | Main, analog, and I/O supply rails | Independent 1.71–3.6 V domains enable precise analog measurement and robust digital I/O drive |
| VSS, VSSA | Digital and analog ground returns | Separate ground planes minimize coupling noise between digital switching and ADC/OPAMP circuits |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15 | General-purpose I/Os | Up to 52 pins support multiple alternate functions (AF0–AF15), including USB, USART, SPI, I²C, and touch sensing |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; compatible with external push-button or supervisor IC assertion |
| BOOT0 | Boot mode selection | High at power-up enables system memory bootloader; controlled by external resistor or MCU firmware |
| VBAT | RTC and backup register supply | Accepts 1.65–3.6 V; sustains RTC/calendar and 32×32-bit registers during main power loss (300 nA quiescent) |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 16 nA Shutdown, 245 nA Standby+RTC, and 28 µA/MHz SMPS-run operation - validated across industrial temp range |
| ART Accelerator™ | Eliminates flash wait states at 80 MHz, ensuring deterministic interrupt latency and real-time task scheduling without SRAM code shadowing |
| Dual 12-bit ADC with oversampling | 5 Msps sampling rate and hardware 16-bit oversampling allow high-resolution sensor data acquisition with <200 µA/Msps power cost |
| Integrated op-amp with PGA | Configurable gain (1–16×) and rail-to-rail I/O support direct connection to resistive/capacitive sensors without external signal conditioning |
| Crystal-less USB 2.0 FS | Internal 48 MHz clock recovery eliminates external crystal and associated BOM cost, footprint, and layout complexity |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition with motion artifact rejection and BLE transmission. IC Role / Device Role / Timing Role: Main controller executing sensor fusion algorithms, managing USB/USART communication, and maintaining RTC-synchronized data logging. Use Value: 245 nA Standby + RTC preserves timekeeping during sleep intervals; dual ADCs sample analog front-end at 5 Msps with hardware oversampling for noise reduction. | Use Scenario: Battery-backed electricity/water meter with tamper detection, pulse counting, and LoRaWAN backhaul. IC Role / Device Role / Timing Role: System-on-chip handling metrology calculations, non-volatile event logging, and low-power radio interface control. Use Value: 16 nA Shutdown mode extends 10-year battery life; LPUART wake-up enables instant response to utility command packets without continuous polling. |
| Industrial Wireless Sensor Node | Energy-Harvesting Remote Controller |
Use Scenario: Vibration/temperature monitoring node powered by piezoelectric harvester, transmitting via Sub-GHz RF. IC Role / Device Role / Timing Role: Power-aware host managing energy buffer management, sensor polling, and burst-mode RF transmission. Use Value: SMPS-compatible 28 µA/MHz Run mode maximizes harvested energy utilization; 4 µs wakeup from Stop ensures rapid response to trigger events. | Use Scenario: Solar-powered HVAC remote with capacitive touch UI, ambient light sensing, and IR transmission. IC Role / Device Role / Timing Role: Single-chip solution integrating TSC for touchkeys, OPAMP for light sensor amplification, and IRTIM for IR carrier generation. Use Value: Integrated 12-channel capacitive sensing eliminates external touch controller; IRTIM provides precise 38 kHz carrier without timer resource overhead. |
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 UFBGA64 package; adds AES-256 crypto engine and 256 KB flash; no Quad SPI interface | Better suited for secure firmware updates and larger code footprints; lacks XIP-capable external memory expansion | Select when cryptographic acceleration or >128 KB flash is required; verify pin compatibility for existing PCB layout |
| STM32L552CEU6 | ARMv8-M TrustZone support, 256 KB flash, 64 KB SRAM; higher active current (42 µA/MHz) | Targeted at certified secure boot and PSA Level 2 applications; requires additional security initialization overhead | Choose only if hardware-enforced isolation and secure key storage are mandatory; expect higher power and BOM cost |
Compared with STM32L432KCU6 and STM32L552CEU6, the STM32L412CBU6P delivers optimal balance of ultra-low static current (245 nA Standby+RTC), integrated analog (dual ADC + OPAMP), and minimal footprint - making it ideal for cost-sensitive, battery-constrained edge nodes where security extensions and extended memory are unnecessary.
Availability
STM32L412CBU6P is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and energy-harvesting remote controllers requiring stable component supply and long-term lifecycle assurance.
Supply support for STM32L412CBU6P 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 µA, with emphasis on battery longevity, integrated analog front-ends, and flexible power architecture for energy-constrained IoT endpoints.
FAQ
What is the maximum operating temperature range for STM32L412CBU6P?
The STM32L412CBU6P is qualified for operation from –40 °C to +125 °C ambient temperature, meeting industrial-grade reliability requirements. This extended range is validated across all low-power modes and peripheral functions, including RTC calibration and ADC linearity, per ST's DS12469 Rev 9 specification.
Does STM32L412CBU6P support external SMPS control, and how is it implemented?
Yes - the MCU supports external SMPS via dedicated VDD12 and VDD12_IO pins, enabling direct control of an external DC-DC converter to reduce system-level power consumption. When enabled, SMPS operation lowers Run-mode current to 28 µA/MHz at 3.3 V, versus 79 µA/MHz in LDO mode, with automatic regulator mode switching managed by the PWR_CR4 register.
Can the integrated op-amp be used in standalone mode without MCU core intervention?
Yes - the OPAMP can operate in standalone mode using internal or external feedback networks, with configurable non-inverting/inverting gain (1–16×) and selectable input sources (PA0–PA7, PB0–PB1). It remains functional in Stop 2 mode when powered by VDDA, enabling always-on sensor signal conditioning independent of CPU activity.
Is USB 2.0 full-speed operation truly crystal-less, and what accuracy is guaranteed?
Yes - the internal clock recovery system (CRS) locks to the USB SOF packet timing, achieving ±0.25 % accuracy over temperature and voltage. This eliminates need for external 48 MHz crystal while maintaining full USB 2.0 FS compliance, validated per USB-IF test plan and documented in Section 3.26 of DS12469 Rev 9.
STM32L412CBU6P 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, (External SMPS Required)
- 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:
STM32L412CBU6P FAQ
1.How can I place an order for STM32L412CBU6P through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412CBU6P 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 STM32L412CBU6P reliable?
The price and inventory of STM32L412CBU6P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412CBU6P is usually 5 days.
3.What payment methods are accepted for STM32L412CBU6P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412CBU6P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412CBU6P?
STM32L412CBU6P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412CBU6P 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 STM32L412CBU6P?
For technical support, including STM32L412CBU6P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412CBU6P requirements.
6.How does Aetrix verify that STM32L412CBU6P is sourced from the original manufacturer or authorized distributors?
All STM32L412CBU6P 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 STM32L412CBU6P meets industry standards.
7.What is the process for return or replacement of STM32L412CBU6P?
All STM32L412CBU6P units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412CBU6P, 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 STM32L412CBU6P part is unused and in its original packaging.
Return procedure for STM32L412CBU6P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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