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STM32L431RC：Ultra-low-power with FPU ARM Cortex-M4 MCU 80 MHz with 256 Kbytes Flash

The STM32L431xx devices are the ultra-low-power microcontrollers based on the high-performance ARM® Cortex®-M4 32-bit RISC core operating at a frequency of up to 80 MHz. The Cortex-M4 core features a Floating point unit (FPU) single precision which supports all ARM single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application security.

The STM32L431xx devices embed high-speed memories (Flash memory up to 256 Kbyte, 64 Kbyte of SRAM), a Quad SPI flash memories interface (available on all packages) and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.

The STM32L431xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall.

The devices offer a fast 12-bit ADC (5 Msps), two comparators, one operational amplifier, two DAC channels, an internal voltage reference buffer, a low-power RTC, one general-purpose 32-bit timer, one 16-bit PWM timer dedicated to motor control, four general-purpose 16-bit timers, and two 16-bit low-power timers.

In addition, up to 21 capacitive sensing channels are available.

They also feature standard and advanced communication interfaces.

Key Features

• Ultra-low-power with FlexPowerControl
  • 1.71 V to 3.6 V power supply
  • -40 °C to 85/105/125 °C temperature range
  • 200 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
  • 8 nA Shutdown mode (5 wakeup pins)
  • 28 nA Standby mode (5 wakeup pins)
  • 280 nA Standby mode with RTC
  • 1.0 μA Stop 2 mode, 1.28 μA Stop 2 with RTC
  • 84 μA/MHz run mode
  • Batch acquisition mode (BAM)
  • 4 μs wakeup from Stop mode
  • Brown out reset (BOR) in all modes except shutdown
  • Interconnect matrix
• Core: ARM® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait-state execution from Flash memory, frequency up to 80 MHz, MPU, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1), and DSP instructions
• Performance Benchmark
  • 1.25 DMIPS/MHz (Drystone 2.1)
  • 273.55 Coremark® (3.42 Coremark/MHz @ 80 MHz)
• Energy Benchmark
  • 176.7 ULPBench® score
• Clock Sources
  • 4 to 48 MHz crystal oscillator
  • 32 kHz crystal oscillator for RTC (LSE)
  • Internal 16 MHz factory-trimmed RC (±1%)
  • Internal low-power 32 kHz RC (±5%)
  • Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
  • Internal 48 MHz with clock recovery
  • 2 PLLs for system clock, audio, ADC
• RTC with HW calendar, alarms and calibration
• Up to 21 capacitive sensing channels: support touchkey, linear and rotary touch sensors
• 11x timers: 1x 16-bit advanced motor-control, 1x 32-bit and 2x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
• Up to 83 fast I/Os, most 5 V-tolerant
• Memories
  • Up to 256 KB single bank Flash, proprietary code readout protection
  • 64 KB of SRAM including 16 KB with hardware parity check
  • Quad SPI memory interface
• Rich analog peripherals (independent supply)
  • 1× 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 μA/Msps
  • 2x 12-bit DAC, low-power sample and hold
  • 1x operational amplifier with built-in PGA
  • 2x ultra-low-power comparators
• 15x communication interfaces
  • 1x SAI (serial audio interface)
  • 3x I2C FM+(1 Mbit/s), SMBus/PMBus
  • 4x USARTs (ISO 7816, LIN, IrDA, modem)
  • 3x SPIs (4x SPIs with the Quad SPI)
  • CAN (2.0B Active) and SDMMC interface
  • SWPMI single wire protocol master I/F
  • IRTIM (Infrared interface)
• 14-channel DMA controller
• True random number generator
• CRC calculation unit, 96-bit unique ID
• Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™

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