Item specifics
Description
STM32L412CBU6 Product Overview
STM32L412CBU6 is an Arm Cortex-M4 MCU at 80 MHz with FPU, UFQFPN-48. 128 KB Flash, 40 KB SRAM, USB 2.0 FS device (crystal-less), 12-bit ADC (10 ch), two comparators, LP timers, RTC, 2×USART, 1×UART, 2×SPI/I2S, 2×I2C. Up to 38 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–85 °C. As a value-line member of the STM32L4 series, the STM32L412CBU6 delivers Cortex-M4 performance and crystal-less USB at extremely low power, purpose-built for power- and cost-sensitive battery-powered IoT nodes, portable devices, and sensor applications.
STM32L412CBU6 Core Features
Core: The STM32L412CBU6 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator
Memory: The STM32L412CBU6 provides 128 KB Flash and 40 KB SRAM
USB: The STM32L412CBU6 integrates a USB 2.0 FS device (crystal-less)
Analog: 12-bit ADC (10 ch), 2×Comparators
Connectivity: 2×USART, 1×UART, 2×SPI/I2S, 2×I2C
Timers: LP Timer, GP Timers, RTC
I/Os: 38 (5 V-tolerant)
Package: UFQFPN-48
Temperature Range: -40°C to 85°C
STM32L412CBU6 Applications
IoT Sensor Nodes: The STM32L412CBU6 is ideal for battery-powered wireless sensors and USB data acquisition modules
Portable Devices: Wearables, portable medical devices, and USB peripherals can leverage the STM32L412CBU6's ultra-low power consumption
Industrial Metering: Water, gas, and electricity meters are perfect applications for the STM32L412CBU6
Consumer Electronics: Remote controls, e-labels, smart cards
Energy Harvesting Applications: Self-powered sensor nodes and energy harvesting systems can rely on the STM32L412CBU6
STM32L412CBU6 Key Advantages
Cortex-M4 + FPU + Ultra-Low Power: The STM32L412CBU6 delivers excellent DSP and floating-point performance while maintaining extremely low power consumption
Integrated Crystal-less USB: The STM32L412CBU6 enables USB communication without an external crystal, simplifying design and saving BOM
128 KB Flash + 40 KB SRAM: The STM32L412CBU6 provides ample storage for complex programs and data processing
2 Built-in Comparators: Signal threshold detection without external components
5 V-tolerant I/Os: Enhanced system noise immunity and simplified external level-shifting circuitry
Ultra-Compact UFQFPN-48 Package: Significantly reduces PCB area while retaining all 38 I/Os
Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries for the STM32L412CBU6
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FAQ
1. What is STM32L412CBU6?
STM32L412CBU6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L4 series, built around an Arm® Cortex®-M4 core with FPU and DSP instructions in a UFQFPN-48 package (7 mm × 7 mm). Operating at 80 MHz, the STM32L412CBU6 provides 128 KB Flash and 40 KB SRAM, along with a USB 2.0 full-speed device controller, a 12-bit 5 Msps ADC, and ultra-low-power comparators. By packing full USB connectivity and high-precision analog features into a compact 48-pin QFN, the STM32L412CBU6 offers a highly integrated, cost-effective solution for space-constrained, battery-powered devices.
2. What are the key specifications of STM32L412CBU6?
Core: Arm® Cortex®-M4, up to 80 MHz, 100 DMIPS with FPU and DSP
Memory: 128 KB Flash, 40 KB SRAM
Operating Voltage: 1.71 V to 3.6 V
Temperature Range: -40 °C to +85 °C (industrial grade)
I/O Count: up to 38
Package: UFQFPN-48 (7 mm × 7 mm)
3. Is the UFQFPN-48 package on the STM32L412CBU6 easy to solder? Is it suitable for small-batch production?
The UFQFPN-48 is an ultra-thin QFN with all pins hidden underneath and a thermal pad. The STM32L412CBU6 requires reflow soldering or a hot-air station—manual soldering with a conventional iron is not feasible. While it saves significant PCB area, it demands precise stencil design and controlled reflow profiles, making the STM32L412CBU6 best suited for automated SMT production. For prototyping, QFN adapter boards or NUCLEO development boards are recommended for initial validation.
4. What applications is STM32L412CBU6 suitable for?
With its compact 48-pin package, 128 KB Flash, USB device interface, and excellent low-power performance, the STM32L412CBU6 is ideal for portable devices with stringent space and power constraints, such as miniature USB dongles, wearable medical sensors, wireless sensor nodes, compact IoT endpoints, and industrial data loggers requiring USB connectivity. The 40 KB SRAM of the STM32L412CBU6 comfortably supports a lightweight RTOS and common USB stacks.
5. What development tools support STM32L412CBU6?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment for the STM32L412CBU6, along with the STM32CubeL4 firmware library. Debugging and programming use ST-Link debuggers. The NUCLEO-L412RB board (LQFP-64) serves as an excellent starting point—while it has a different package, the peripheral architecture and software are fully compatible with the STM32L412CBU6, enabling smooth migration to the 48-pin QFN package after validation.
6. What is the power consumption of the STM32L412CBU6 across its low-power modes?
Temperature Range: -40 °C to +85 °C
Ultra-low-power modes of the STM32L412CBU6:
Shutdown mode: ~33 nA (5 wake-up pins)
Standby mode: ~125 nA (5 wake-up pins), ~430 nA with RTC
Stop 2 mode: ~1.2 µA, ~1.4 µA with RTC
Run mode: ~100 µA/MHz (LDO mode)
7. What key peripheral interfaces does STM32L412CBU6 offer?
Communication: I²C, SPI, UART/USART, USB 2.0 Full-Speed Device
Analog: 12-bit 5 Msps ADC, ultra-low-power comparators
Timers: 16-bit general-purpose timers, low-power timer
Others: Capacitive touch sensing channels (TSC)
8. How do I choose between STM32L412CBU6, L412RBT6 (LQFP-64), and L412KBT6 (LQFP-32)?
All three share the same core and memory configuration. The STM32L412CBU6 is a 48-pin QFN (38 I/Os) that balances miniaturization and I/O count; RBT6 is a 64-pin LQFP (52 I/Os) ideal for hand-soldering and high pin-count designs; KBT6 is a 32-pin LQFP (26 I/Os) offering the smallest footprint and lowest cost. Select based on your I/O requirements, assembly process, and PCB space constraints.
9. Is 40 KB SRAM sufficient for the STM32L412CBU6 to run a USB stack, and how can memory be optimized?
The 40 KB SRAM of the STM32L412CBU6 can handle a lightweight RTOS (e.g., FreeRTOS) and USB device libraries (CDC, HID) with careful memory planning. Use static allocation to reduce fragmentation, trim unused stack modules, enable compiler optimizations, and leverage DMA to offload data transfers. For applications needing larger buffers, external SPI Flash or FRAM can be added via the SPI interface.
10. What if my project needs CAN or a DAC? Can STM32L412CBU6 support that?
The STM32L412CBU6 does not include a native CAN controller or DAC. If CAN is essential, consider upgrading to the STM32L432 or STM32L433. If you must stay with the STM32L412CBU6, you can add an external SPI-to-CAN controller (e.g., MCP2515) and an external DAC (e.g., MCP4725) via I2C/SPI, but this will increase circuit complexity, cost, and PCB footprint—evaluate carefully during the design phase.