Overview
The STM32L412KBU3 is an ultra-low-power microcontroller from STMicroelectronics, part of the STM32L412xx family. It is based on the high-performance Arm® Cortex®-M4 32-bit RISC core, operating at a frequency of up to 80 MHz. The Cortex-M4 core includes a Floating Point Unit (FPU) that supports all Arm® single-precision data-processing instructions and data types, along with a full set of DSP instructions and a Memory Protection Unit (MPU) for enhanced application security.
This microcontroller is designed for low-power applications, featuring various power-saving modes and a comprehensive set of peripherals. It includes high-speed memories such as up to 128 Kbyte of flash memory and 40 Kbyte of SRAM, as well as a Quad SPI flash memory interface. The device supports multiple communication interfaces, including USB, I2C, SPI, and USARTs.
Key Specifications
| Specification | Details |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU, up to 80 MHz |
| Memory | Up to 128 Kbyte flash, 40 Kbyte SRAM |
| Power Supply | 1.71 V to 3.6 V (internal LDO), 1.00 to 1.32 V (external SMPS) |
| Temperature Range | -40 °C to 85/125 °C |
| Power Consumption | 300 nA in VBAT mode, 16 nA Shutdown mode, 32 nA Standby mode, 245 nA Standby mode with RTC |
| Timers | 1x 32-bit, 4x 16-bit general purpose, 2x low-power 16-bit timers, 1x 16-bit advanced motor-control timer |
| Analog Peripherals | 2x 12-bit ADC (5 Msps), 1x operational amplifier, 1x ultra-low-power comparator |
| Communication Interfaces | USB 2.0 full-speed, 3x I2C, 2x SPI, 3x USARTs, 1x LPUART |
| Package | UFQFPN 32 5x5x0.55 mm |
Key Features
- Ultra-low-power with FlexPowerControl, including multiple power-saving modes (VBAT, Shutdown, Standby, Stop 2)
- High-performance Arm® Cortex®-M4 CPU with FPU and DSP instructions
- Adaptive real-time accelerator (ART Accelerator™) for 0-wait-state execution from flash memory
- Memory protection unit (MPU) for enhanced security
- Quad SPI flash memory interface with XIP capability
- Rich analog peripherals: 2x 12-bit ADC, 1x operational amplifier, 1x ultra-low-power comparator
- Extensive range of communication interfaces: USB, I2C, SPI, USARTs, LPUART
- Up to 12 capacitive sensing channels for touchkey, linear, and rotary touch sensors
- True random number generator, CRC calculation unit, and 96-bit unique ID
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
Applications
- Low-power IoT devices and smart sensors
- Industrial automation and control systems
- Medical devices requiring low power consumption
- Consumer electronics such as wearables and smart home devices
- Automotive systems, especially those requiring low power and high performance
Q & A
- What is the core architecture of the STM32L412KBU3?
The STM32L412KBU3 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU) and supports DSP instructions.
- What are the power supply ranges for the STM32L412KBU3?
The device operates from a 1.71 V to 3.6 V power supply using the internal LDO regulator, and from 1.00 to 1.32 V using an external SMPS supply.
- What are the key power-saving modes of the STM32L412KBU3?
The device features VBAT mode, Shutdown mode, Standby mode, and Stop 2 mode, among others, to minimize power consumption.
- What types of timers are available on the STM32L412KBU3?
The device includes 1x 32-bit timer, 4x 16-bit general-purpose timers, 2x low-power 16-bit timers, and 1x 16-bit advanced motor-control timer.
- What analog peripherals are included in the STM32L412KBU3?
The device features 2x 12-bit ADCs, 1x operational amplifier, and 1x ultra-low-power comparator.
- What communication interfaces are available on the STM32L412KBU3?
The device supports USB 2.0 full-speed, 3x I2C, 2x SPI, 3x USARTs, and 1x LPUART.
- What is the package type of the STM32L412KBU3?
The device is available in a UFQFPN 32 5x5x0.55 mm package.
- Does the STM32L412KBU3 support capacitive sensing?
Yes, the device supports up to 12 capacitive sensing channels for touchkey, linear, and rotary touch sensors.
- What development tools are supported for the STM32L412KBU3?
The device supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™ for development.
- Is the STM32L412KBU3 RoHS compliant?
Yes, the device is RoHS compliant and comes in ECOPACK2 packages.
- What are some typical applications for the STM32L412KBU3?
The device is suitable for low-power IoT devices, industrial automation, medical devices, consumer electronics, and automotive systems.
