STM32L431RBT6

This is an ultra-low-power ARM Cortex-M4 32-bit MCU+FPU with 100DMIPS performance, up to 256KB Flash and 64KB SRAM, with integrated analog and audio features.

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 (Dhrystone 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)
• 1x 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