Overview
The STM32L431KBU3 is an ultra-low-power microcontroller from STMicroelectronics, based on the high-performance Arm® Cortex®-M4 32-bit RISC core. This device operates at a frequency of up to 80 MHz and features a Floating Point Unit (FPU) for single-precision data processing, as well as a full set of DSP instructions and a Memory Protection Unit (MPU) for enhanced application security. It is designed for low-power applications, offering various power-saving modes and a wide temperature range of -40 to 125°C.
Key Specifications
| Specification | Details |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU, up to 80 MHz |
| Memory | Up to 256 KB Flash, 64 KB SRAM |
| Power Supply | 1.71 V to 3.6 V |
| Temperature Range | -40 °C to 85/105/125 °C |
| Timers | 11 timers: 1x 32-bit, 5x 16-bit, 2x low-power 16-bit timers |
| ADC | 1x 12-bit ADC, up to 5 Msps |
| DAC | 2x 12-bit DAC output channels |
| Communication Interfaces | CAN, I2C, LPUART, SAI, SPI, USART |
| Capacitive Sensing Channels | Up to 21 channels |
| Package | UFQFPN 32 5x5x0.55 mm |
| I/Os | Up to 83 fast I/Os, most 5 V-tolerant |
Key Features
- Ultra-low-power with FlexPowerControl
- Batch acquisition mode (BAM) and 4 µs wakeup from Stop mode
- Brown out reset (BOR) and interconnect matrix
- Adaptive real-time accelerator (ART Accelerator™) for 0-wait-state execution from Flash memory
- Performance benchmark: 1.25 DMIPS/MHz (Drystone 2.1), 273.55 CoreMark®
- Energy benchmark: 176.7 ULPBench® score
- RTC with HW calendar, alarms, and calibration
- Operational amplifier with built-in PGA and ultra-low-power comparators
- Up to 21 capacitive sensing channels for touchkey, linear, and rotary touch sensors
- Comprehensive set of power-saving modes: Shutdown, Standby, Stop 2 mode, etc.
Applications
The STM32L431KBU3 is suitable for a variety of applications requiring low power consumption and high performance. These include:
- Industrial automation and control systems
- Personal electronics such as wearables and IoT devices
- Medical devices requiring low power and high precision
- Automotive systems, especially those needing robust temperature range support
- Smart home and building automation
Q & A
- What is the core architecture of the STM32L431KBU3?
The STM32L431KBU3 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU).
- What is the maximum operating frequency of the STM32L431KBU3?
The maximum operating frequency is up to 80 MHz.
- What are the power supply voltage ranges for the STM32L431KBU3?
The power supply voltage ranges from 1.71 V to 3.6 V.
- What are the key power-saving modes available on the STM32L431KBU3?
The device features Shutdown, Standby, Stop 2 mode, and other power-saving modes.
- What types of communication interfaces are available on the STM32L431KBU3?
The device includes CAN, I2C, LPUART, SAI, SPI, and USART interfaces.
- How many capacitive sensing channels does the STM32L431KBU3 support?
It supports up to 21 capacitive sensing channels.
- What is the temperature range for the STM32L431KBU3?
The temperature range is -40 °C to 85/105/125 °C.
- What type of package is the STM32L431KBU3 available in?
The device is available in a UFQFPN 32 5x5x0.55 mm package.
- Does the STM32L431KBU3 support any specific timers?
Yes, it supports 11 timers including 1x 32-bit, 5x 16-bit, and 2x low-power 16-bit timers.
- What is the performance benchmark of the STM32L431KBU3?
The performance benchmark is 1.25 DMIPS/MHz (Drystone 2.1) and 273.55 CoreMark®.
