Overview
The STM32L431KBU6 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 and DSP instructions. It also includes a Memory Protection Unit (MPU) to enhance application security.
The microcontroller is equipped with high-speed memories, including up to 256 Kbytes of Flash memory and 64 Kbytes of SRAM. It also features a Quad SPI flash memory interface and an extensive range of enhanced I/Os and peripherals connected to multiple buses.
The STM32L431KBU6 supports a wide temperature range from -40 °C to +85 °C, +105 °C, or +125 °C, and operates from a 1.71 to 3.6 V power supply. It includes various power-saving modes, making it suitable for low-power applications.
Key Specifications
| Parameter | Value |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU |
| Maximum Clock Frequency | 80 MHz |
| Flash Memory | Up to 256 KB |
| SRAM | 64 KB |
| ADC Resolution | 12-bit, up to 16-bit with hardware oversampling |
| DAC Channels | 2 x 12-bit |
| Operational Amplifier | 1 with built-in PGA |
| Comparators | 2 ultra-low-power comparators |
| Timers | 1 x 32-bit, 5 x 16-bit, 2 x low-power 16-bit timers |
| Communication Interfaces | I2C, USART, SPI, CAN (2.0B Active), SDMMC, SAI, LPUART, SWPMI, IRTIM |
| Power Supply | 1.71 V to 3.6 V |
| Temperature Range | -40 °C to +85 °C, +105 °C, or +125 °C |
| Package | UFQFPN 32 5x5x0.55 mm |
Key Features
- Ultra-low-power with FlexPowerControl
- 1.71 V to 3.6 V power supply
- -40 °C to +85 °C, +105 °C, or +125 °C temperature range
- Low-power modes: 200 nA in VBAT mode, 8 nA Shutdown mode, 28 nA Standby mode, 280 nA Standby mode with RTC, 1.0 μA Stop 2 mode, 1.28 μA with RTC
- Fast 12-bit ADC (5 Msps), up to 16-bit with hardware oversampling
- Two 12-bit DAC output channels
- One operational amplifier with built-in PGA
- Two ultra-low-power comparators
- Up to 21 capacitive sensing channels
- Multiple communication interfaces: I2C, USART, SPI, CAN (2.0B Active), SDMMC, SAI, LPUART, SWPMI, IRTIM
- Internal voltage reference buffer, low-power RTC, and general-purpose timers
- True random number generator and CRC calculation unit
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
Applications
The STM32L431KBU6 is suitable for a wide range of applications due to its ultra-low-power consumption and rich set of peripherals. Some of the key application areas include:
- Industrial automation and control systems
- Personal electronics and wearable devices
- Medical devices requiring low power consumption
- IoT devices and smart home applications
- Automotive systems, especially those requiring low power and high performance
Q & A
- What is the core architecture of the STM32L431KBU6?
The STM32L431KBU6 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU).
- What is the maximum clock frequency of the STM32L431KBU6?
The maximum clock frequency is 80 MHz.
- How much Flash and SRAM memory does the STM32L431KBU6 have?
The device has up to 256 KB of Flash memory and 64 KB of SRAM.
- What is the ADC resolution of the STM32L431KBU6?
The ADC resolution is 12-bit, with the option for up to 16-bit with hardware oversampling.
- What are the power-saving modes available on the STM32L431KBU6?
The device supports several low-power modes, including VBAT mode, Shutdown mode, Standby mode, and Stop 2 mode.
- What communication interfaces are available on the STM32L431KBU6?
The device features I2C, USART, SPI, CAN (2.0B Active), SDMMC, SAI, LPUART, SWPMI, and IRTIM interfaces.
- What is the operating temperature range of the STM32L431KBU6?
The operating temperature range is -40 °C to +85 °C, +105 °C, or +125 °C.
- What package options are available for the STM32L431KBU6?
The device is available in a UFQFPN 32 5x5x0.55 mm package.
- Does the STM32L431KBU6 support capacitive sensing?
Yes, it supports up to 21 capacitive sensing channels.
- What development tools are supported by the STM32L431KBU6?
The device supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™.
