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STMicroelectronics STM32L412CBT6
- Part No.:
- STM32L412CBT6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L412CBT6.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,340
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Product details
Overview
STM32L412CBT6 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 delivers 28 µA/MHz run current at 3.3 V - deployed in battery-powered IoT sensor nodes requiring long-term autonomous operation.
For engineers reviewing the STM32L412CBT6 datasheet, STM32L412CBT6 pinout, STM32L412CBT6 application, or STM32L412CBT6 equivalent, key selection criteria include verified ultra-low-power mode currents (32 nA Standby, 245 nA Standby+RTC), LQFP32 package compatibility, USB 2.0 full-speed crystal-less capability, and hardware-accelerated cryptographic support via TRNG and CRC unit.
Technical Context
The STM32L412CBT6 integrates an Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz. Its power architecture includes dual-regulator support (LDO/SMPS), FlexPowerControl for dynamic voltage scaling, and five low-power modes - Stop 2 (0.7 µA), Standby (32 nA), and VBAT (300 nA) - all validated across -40 °C to 85 °C.
Analog subsystems operate on independent supplies: two 12-bit ADCs achieve 5 Msps with hardware oversampling up to 16-bit resolution and 200 µA/Msps efficiency; one OPAMP includes programmable gain; one comparator offers rail-to-rail input and fast response (<1 µs). The device also embeds a 32-channel DMA controller and quad-SPI interface with XIP capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS performance |
| Memory | 128 KB flash (single-bank, code readout protection), 40 KB SRAM (8 KB with parity) |
| Power Consumption | 28 µA/MHz in SMPS Run mode; 32 nA in Standby; 245 nA in Standby + RTC |
| Analog Peripherals | 2× 12-bit ADC (5 Msps, 16-bit oversampling), 1× OPAMP 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), SysTick, watchdogs |
| Security & Debug | TRNG, CRC unit, 96-bit unique ID, SWD/JTAG debug, Embedded Trace Macrocell™ |
Pinout & Package
LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 25 user I/Os, 3.3 V tolerant (most pins), and dedicated VDDA/VSSA analog supply pins. Includes dedicated NRST, BOOT0, VBAT, VREF+, VREF–, and SWDIO/SWCLK debug pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main digital power/ground | Supplies core logic; decoupling required per datasheet layout guidelines |
| VDDA, VSSA | Analog power/ground | Independent supply for ADC/OPAMP/COMP; must be filtered and isolated from digital noise |
| PA0–PA15, PB0–PB12 | General-purpose I/Os | 25 total GPIOs; most 5 V-tolerant; support multiple alternate functions (USART, SPI, I²C, etc.) |
| NRST | Active-low reset input | Asynchronous reset pin; internal pull-up; accepts external push-button or supervisor IC |
| BOOT0 | Boot mode selection | High at power-up selects system memory bootloader; tied low for main flash execution |
| SWDIO / SWCLK | Debug interface signals | Serial Wire Debug (SWD) interface for programming and real-time debugging |
| VBAT | Backup power supply | Connects to coin cell or supercap for RTC and 32×32-bit backup registers during main power loss |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables seamless transition between 5 low-power modes with sub-microsecond wake-up (4 µs from Stop) |
| ART Accelerator™ | Eliminates flash wait states at 80 MHz, delivering deterministic real-time performance without external RAM |
| Dual-regulator support (LDO/SMPS) | Reduces active-mode current by >60% vs LDO-only operation; enables 28 µA/MHz efficiency |
| Hardware crypto acceleration | TRNG + CRC unit provides entropy source and integrity checking for secure firmware updates and OTA encryption |
| Capacitive touch sensing | 12-channel TSC supports touchkey, linear, and rotary sensors without external components |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
Use Scenario: Battery-powered water/gas meter with hourly pressure/temperature logging and LoRaWAN transmission. IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, RTC-triggered data aggregation, LPUART communication with transceiver, and ultra-low-power sleep scheduling. Use Value: 32 nA Standby current extends 10-year battery life; LPUART wake-up from Stop 2 enables precise transmission timing with minimal energy overhead. |
Use Scenario: Environmental monitoring node measuring temperature, humidity, and CO₂ using I²C sensors and transmitting via BLE. IC Role / Device Role / Timing Role: Central MCU coordinating sensor polling, data fusion, USB-based configuration, and adaptive duty-cycling based on ambient light and motion detection. Use Value: Dual 12-bit ADCs sample multiple sensors simultaneously at 5 Msps; built-in OPAMP conditions analog sensor outputs before digitization, eliminating external signal conditioning. |
| Portable Medical Device | Industrial Predictive Maintenance |
Use Scenario: Handheld pulse oximeter with optical front-end, OLED display, and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Real-time signal processor for PPG waveform analysis, driving OLED via SPI, managing USB charging, and enforcing safety-critical watchdog supervision. Use Value: ART Accelerator ensures jitter-free LED timing control; 245 nA Standby+RTC maintains timekeeping during device idle without draining primary battery. |
Use Scenario: Vibration-sensing module mounted on motor housing, performing FFT-based anomaly detection and alerting via RS-485. IC Role / Device Role / Timing Role: Edge analytics engine executing lightweight ML inference on accelerometer data, synchronizing samples via hardware trigger from LPTIM2, and buffering results in 40 KB SRAM. Use Value: 8 KB SRAM with hardware parity prevents silent memory corruption in harsh EMI environments; quad-SPI XIP allows direct execution from external flash for firmware scalability. |
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, includes AES-256 and SHA-256 accelerators | Better suited for secure firmware update and encrypted sensor data pipelines | Select when cryptographic offload and larger code space outweigh cost sensitivity |
| STM32L071CBT6 | Cortex-M0+ core, 192 KB flash, lower performance (32 MHz), higher active current (116 µA/MHz) | Targeted at simpler, cost-constrained designs with less demanding compute or analog requirements | Select when application requires only basic peripherals and lowest BOM cost, not ultra-low-power runtime efficiency |
Compared with STM32L432KCU6, the STM32L412CBT6 trades cryptographic acceleration and memory size for lower cost and proven 28 µA/MHz SMPS efficiency; versus STM32L071CBT6, it delivers 3× higher DMIPS and 2.5× lower active current - making it optimal for compute- and power-sensitive edge nodes.
Availability
STM32L412CBT6 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical devices, smart utility meters, and industrial predictive maintenance modules requiring stable component supply and long-term lifecycle assurance.
Supply support for STM32L412CBT6 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 automotive-grade components.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, combining Cortex-M4+FPU with proprietary power architecture and integrated analog for sensor-edge convergence.
FAQ
Does STM32L412CBT6 support external SMPS integration?
Yes. The STM32L412CBT6 explicitly supports external switched-mode power supply (SMPS) via dedicated VDD12 and VDDA12 pins. When enabled, SMPS reduces active-mode current to 28 µA/MHz at 3.3 V - a 65% improvement over LDO-only operation. Configuration requires setting PWR_CR2[PLS] and configuring the regulator control register per Section 3.9.3 of DS12469 Rev 9.
What is the maximum ADC sampling rate and resolution achievable?
The STM32L412CBT6 features two independent 12-bit ADCs, each capable of 5 Msps (mega-samples per second) in interleaved mode. With hardware oversampling, effective resolution reaches 16 bits at reduced rates (e.g., 12-bit @ 5 Msps → 16-bit @ 312.5 kSps). Power consumption is 200 µA per Msps, validated across -40 °C to 85 °C per Table 49 and Section 6.3.18.
Can the OPAMP be used in standalone mode without MCU intervention?
No. The integrated OPAMP requires configuration and enablement via the OPAMPx_CSR register under CPU or DMA control. It does not operate autonomously - gain, mode (non-inverting/inverting), and PGA settings must be written by firmware. However, once configured, it remains active in Stop 2 mode (Section 3.17), enabling low-power analog signal conditioning during extended sleep intervals.
Is USB crystal-less operation fully supported on STM32L412CBT6?
Yes. The STM32L412CBT6 implements a full-speed USB 2.0 interface with integrated clock recovery system (CRS), eliminating the need for an external 48 MHz crystal. This is validated per Section 3.26 and electrical characteristics in Table 6.3.24, supporting LPM (Link Power Management) and BCD (Battery Charging Detection) without external timing components.
STM32L412CBT6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- 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:
STM32L412CBT6 FAQ
1.How can I place an order for STM32L412CBT6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L412CBT6 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 STM32L412CBT6 reliable?
The price and inventory of STM32L412CBT6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L412CBT6 is usually 5 days.
3.What payment methods are accepted for STM32L412CBT6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L412CBT6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L412CBT6?
STM32L412CBT6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L412CBT6 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 STM32L412CBT6?
For technical support, including STM32L412CBT6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L412CBT6 requirements.
6.How does Aetrix verify that STM32L412CBT6 is sourced from the original manufacturer or authorized distributors?
All STM32L412CBT6 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 STM32L412CBT6 meets industry standards.
7.What is the process for return or replacement of STM32L412CBT6?
All STM32L412CBT6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L412CBT6, 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 STM32L412CBT6 part is unused and in its original packaging.
Return procedure for STM32L412CBT6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L412CBT6 Tags
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