Overview
The STM32L431RBT6 is an ultra-low-power microcontroller from STMicroelectronics, based on the high-performance Arm® Cortex®-M4 32-bit RISC core. This microcontroller 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 device 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 STM32L431RBT6 is designed for low-power applications, offering various power-saving modes and independent power supplies for analog components.
Key Specifications
| Parameter | Specification |
|---|---|
| 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 °C / +105 °C / +125 °C |
| ADC | 1x 12-bit ADC, 5 Msps |
| DAC | 2x 12-bit DAC output channels |
| Timers | 1x 32-bit, 5x 16-bit timers |
| Communication Interfaces | 3x SPI, 4x USART, 1x LPUART, 3x I2C, CAN 2.0B |
| Package | LQFP 64 (10x10x1.4 mm) |
| I/Os | Up to 83 fast I/Os, most 5 V-tolerant |
| Capacitive Sensing Channels | Up to 21 channels |
Key Features
- Ultra-low-power with FlexPowerControl
- 1.71 V to 3.6 V power supply
- -40 °C to +85 °C / +105 °C / +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
- Fast 12-bit ADC (5 Msps), two comparators, one operational amplifier
- Up to 21 capacitive sensing channels
- Rich communication interfaces including SPI, USART, I2C, and CAN 2.0B
- Internal voltage reference buffer, low-power RTC, and multiple timers
- True random number generator, CRC calculation unit, and 96-bit unique ID
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
Applications
The STM32L431RBT6 is suitable for a wide range of low-power applications, including:
- IoT devices and smart home appliances
- Industrial automation and control systems
- Medical devices and healthcare equipment
- Automotive systems and telematics
- Consumer electronics and wearables
Q & A
- What is the core architecture of the STM32L431RBT6?
The STM32L431RBT6 is based on the Arm® Cortex®-M4 32-bit RISC core with a Floating Point Unit (FPU).
- What is the maximum operating frequency of the STM32L431RBT6?
The maximum operating frequency is up to 80 MHz.
- What are the power supply requirements for the STM32L431RBT6?
The device operates from a 1.71 V to 3.6 V power supply.
- What are the low-power modes available on the STM32L431RBT6?
The device features several low-power modes including VBAT mode, Shutdown mode, Standby mode, and Stop 2 mode.
- What analog peripherals are available on the STM32L431RBT6?
The device includes a 12-bit ADC, two 12-bit DAC channels, an operational amplifier, and two ultra-low-power comparators.
- What communication interfaces does the STM32L431RBT6 support?
The device supports multiple communication interfaces such as SPI, USART, I2C, and CAN 2.0B.
- What is the package type of the STM32L431RBT6?
The device is available in an LQFP 64 (10x10x1.4 mm) package.
- Does the STM32L431RBT6 support capacitive sensing?
Yes, it supports up to 21 capacitive sensing channels.
- What development tools are available for the STM32L431RBT6?
The device supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™ for development.
- Is the STM32L431RBT6 RoHS compliant?
Yes, the STM32L431RBT6 is RoHS compliant and ECOPACK2 certified.
