Overview
The STM32L431KCU6 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) that supports all Arm® single-precision data-processing instructions and data types. It also includes a full set of DSP instructions and a Memory Protection Unit (MPU) to enhance application security.
The microcontroller is designed with high-speed memories, including up to 256 Kbytes of Flash memory and 64 Kbytes of SRAM. It also includes a Quad SPI flash memory interface and an extensive range of enhanced I/Os and peripherals connected to multiple buses.
The STM32L431KCU6 offers several power-saving modes, making it suitable for low-power applications. It operates within a temperature range of -40 to +85 °C (or up to +125 °C junction) and is powered by a 1.71 to 3.6 V supply.
Key Specifications
| Specification | Details |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU, up to 80 MHz |
| Memories | Up to 256 KB Flash, 64 KB SRAM, Quad SPI memory interface |
| Power Supply | 1.71 V to 3.6 V |
| Temperature Range | -40 °C to +85/105/125 °C |
| 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 |
| ADC | 1x 12-bit ADC, 5 Msps, up to 16-bit with hardware oversampling |
| DAC | 2x 12-bit DAC output channels, low-power sample and hold |
| Timers | 1x 32-bit, 5x 16-bit timers, 2x low-power 16-bit timers, 2x watchdogs, SysTick timer |
| Communication Interfaces | 1x SAI, 3x I2C, 4x USARTs, 1x LPUART, 3x SPIs, 1x Quad SPI, CAN (2.0B Active), SDMMC interface |
| Capacitive Sensing Channels | Up to 21 channels, support touchkey, linear and rotary touch sensors |
| Package | UFQFPN 32 5x5x0.55 mm |
Key Features
- Ultra-low-power with FlexPowerControl
- Arm® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™), frequency up to 80 MHz
- High-speed memories: up to 256 KB Flash, 64 KB SRAM, Quad SPI memory interface
- Rich analog peripherals: 12-bit ADC, 12-bit DAC, operational amplifier, ultra-low-power comparators
- Multiple communication interfaces: SAI, I2C, USARTs, LPUART, SPIs, Quad SPI, CAN, SDMMC
- Up to 21 capacitive sensing channels
- 11 timers: 1x 32-bit, 5x 16-bit, 2x low-power 16-bit timers, 2x watchdogs, SysTick timer
- RTC with HW calendar, alarms, and calibration
- True random number generator, CRC calculation unit, 96-bit unique ID
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
- All packages are ECOPACK2® compliant
Applications
The STM32L431KCU6 is suitable for a wide range of applications that require ultra-low power consumption and high performance. These include:
- Industrial automation and control systems
- Medical devices requiring low power and high precision
- Consumer electronics such as smart home devices and wearables
- Automotive systems, especially those needing low power modes
- IOT devices and sensor networks
- Energy harvesting and battery-powered devices
Q & A
- What is the core architecture of the STM32L431KCU6?
The STM32L431KCU6 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU).
- What is the maximum operating frequency of the STM32L431KCU6?
The maximum operating frequency is up to 80 MHz.
- What are the power supply requirements for the STM32L431KCU6?
The device operates from a 1.71 V to 3.6 V power supply.
- What are the key power-saving modes of the STM32L431KCU6?
The device features several power-saving modes including VBAT mode (200 nA), Shutdown mode (8 nA), Standby mode (28 nA), and Stop 2 mode (1.0 µA).
- What types of timers are available on the STM32L431KCU6?
The device includes 1x 32-bit timer, 5x 16-bit timers, 2x low-power 16-bit timers, 2x watchdogs, and a SysTick timer.
- What communication interfaces are supported by the STM32L431KCU6?
The device supports SAI, I2C, USARTs, LPUART, SPIs, Quad SPI, CAN (2.0B Active), and SDMMC interfaces.
- Does the STM32L431KCU6 support capacitive sensing?
Yes, it supports up to 21 capacitive sensing channels for touchkey, linear, and rotary touch sensors.
- What is the package type of the STM32L431KCU6?
The device is available in a UFQFPN 32 5x5x0.55 mm package.
- Is the STM32L431KCU6 environmentally friendly?
Yes, all packages are ECOPACK2® compliant.
- What development tools are supported by the STM32L431KCU6?
The device supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™.
- What is the temperature range for the STM32L431KCU6?
The device operates within a temperature range of -40 °C to +85/105/125 °C.
