Overview
The STM32L431CBU6TR is a member of the STM32L431xx family of ultra-low-power microcontrollers from STMicroelectronics. These devices are based on the high-performance Arm® Cortex®-M4 32-bit RISC core, operating at frequencies 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.
The microcontroller is designed for low-power applications, offering various power-saving modes and a wide temperature range of -40 °C to 85/105/125 °C. It features high-speed memories, including up to 256 KB of Flash memory and 64 KB of SRAM, as well as a Quad SPI flash memory interface.
Key Specifications
| Specification | Details |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU, up to 80 MHz |
| Flash Memory | Up to 256 KB single bank Flash |
| SRAM | 64 KB, including 16 KB with hardware parity check |
| Power Supply | 1.71 V to 3.6 V |
| Temperature Range | -40 °C to 85/105/125 °C |
| Power Consumption | 200 nA in VBAT mode, 8 nA in Shutdown mode, 28 nA in Standby mode, 1.0 µA in Stop 2 mode |
| 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 | 11x timers: 1x 16-bit advanced motor-control, 1x 32-bit, 2x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers |
| Communication Interfaces | 3x I2C, 4x USART, 1x LPUART, 3x SPI, 1x Quad SPI, CAN 2.0B, SDMMC interface |
| Capacitive Sensing Channels | Up to 21 channels: support touchkey, linear and rotary touch sensors |
| Package | UFQFPN 48 7x7x0.55 mm |
Key Features
- Ultra-low-power with FlexPowerControl
- Arm® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait-state execution from Flash memory
- High-performance analog peripherals: 12-bit ADC, 12-bit DAC, operational amplifier with built-in PGA, ultra-low-power comparators
- Rich communication interfaces: I2C, USART, LPUART, SPI, Quad SPI, CAN 2.0B, SDMMC
- Up to 21 capacitive sensing channels supporting touchkey, linear, and rotary touch sensors
- RTC with HW calendar, alarms, and calibration
- Multiple power-saving modes: Shutdown, Standby, Stop 2, VBAT mode
- Internal clock sources: crystal oscillators, internal RC oscillators, PLLs for system clock, audio, and ADC
- True random number generator, CRC calculation unit, 96-bit unique ID
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
Applications
The STM32L431CBU6TR is suitable for a wide range of applications that require low power consumption and high performance. These include:
- Industrial automation and control systems
- Medical devices and healthcare equipment
- Consumer electronics and appliances
- Automotive systems, especially those requiring low power and high reliability
- IoT devices and smart home applications
- Energy metering and smart grid solutions
Q & A
- What is the core architecture of the STM32L431CBU6TR?
The STM32L431CBU6TR is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU).
- What is the operating temperature range of the STM32L431CBU6TR?
The operating temperature range is -40 °C to 85/105/125 °C.
- What are the power consumption modes available in the STM32L431CBU6TR?
The device supports various power-saving modes including Shutdown, Standby, Stop 2, and VBAT mode.
- What types of communication interfaces are available on the STM32L431CBU6TR?
The device features I2C, USART, LPUART, SPI, Quad SPI, CAN 2.0B, and SDMMC interfaces.
- Does the STM32L431CBU6TR support capacitive sensing?
Yes, it supports up to 21 capacitive sensing channels for touchkey, linear, and rotary touch sensors.
- What is the maximum frequency of the Cortex-M4 core in the STM32L431CBU6TR?
The Cortex-M4 core operates at frequencies up to 80 MHz.
- What types of timers are available on the STM32L431CBU6TR?
The device includes 11 timers: 1x 16-bit advanced motor-control, 1x 32-bit, 2x 16-bit general purpose, 2x 16-bit basic, and 2x low-power 16-bit timers.
- Does the STM32L431CBU6TR have any specific power management features?
Yes, it features independent power supplies for analog peripherals and a VBAT input for backing up the RTC and backup registers.
- What development tools are supported by the STM32L431CBU6TR?
The device supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™.
- Is the STM32L431CBU6TR RoHS compliant?
Yes, the device is RoHS compliant and meets the ECOPACK2 standards.
- What is the package type of the STM32L431CBU6TR?
The device is available in a UFQFPN 48 7x7x0.55 mm package.
