STM32L431RBT6TR

ARM Cortex-M4 80MHz 闪存：128K@x8bit RAM：64KB

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.

The STM32L431xx operates in the -40 to +85 °C +105 °C junction, -40 to +105 °C +125 °C junction and -40 to +125 °C +130 °C junction temperature ranges from a 1.71 to 3.6 V power supply. A comprehensive set of power-saving modes allows the design of low-power applications.

Some independent power supplies are supported: analog independent supply input for ADC, DAC, OPAMP and comparators. A VBAT input allows to backup the RTC and backup registers.

The STM32L431xx family offers nine packages from 32 to 100-pin packages.

**Key Features**

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Ultra-low-power with FlexPowerControl

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1.71 V to 3.6 V power supply

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-40 °C to 85/105/125 °C temperature range

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200 nA in VBAT mode: supply for RTC and 32x32-bit backup registers

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8 nA Shutdown mode 5 wakeup pins

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28 nA Standby mode 5 wakeup pins

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280 nA Standby mode with RTC

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1.0 μA Stop 2 mode, 1.28 μA with RTC

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84 μA/MHz run mode

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Batch acquisition mode BAM

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4 μs wakeup from Stop mode

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Brown out reset BOR

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Interconnect matrix

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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 and DSP instructions

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Performance benchmark

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1.25 DMIPS/MHz Drystone 2.1

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273.55 CoreMark® 3.42 CoreMark/MHz @ 80 MHz

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Energy benchmark

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176.7 ULPBench® score

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Clock Sources

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4 to 48 MHz crystal oscillator

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32 kHz crystal oscillator for RTC LSE

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Internal 16 MHz factory-trimmed RC ±1%

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Internal low-power 32 kHz RC ±5%

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Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE better than ±0.25 % accuracy

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Internal 48 MHz with clock recovery

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2 PLLs for system clock, audio, ADC

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Up to 83 fast I/Os, most 5 V-tolerant

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RTC with HW calendar, alarms and calibration

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Up to 21 capacitive sensing channels: support touchkey, linear and rotary touch sensors

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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

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Memories

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Up to 256 KB single bank Flash, proprietary code readout protection

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64 KB of SRAM including 16 KB with hardware parity check

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Quad SPI memory interface

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Rich analog peripherals independent supply

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1× 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 μA/Msps

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2x 12-bit DAC, low-power sample and hold

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1x operational amplifier with built-in PGA

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2x ultra-low-power comparators

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16x communication interfaces

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1x SAI serial audio interface

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3x I2C FM+1 Mbit/s, SMBus/PMBus

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4x USARTs ISO 7816, LIN, IrDA, modem

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1x LPUART Stop 2 wake-up

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3x SPIs 4x SPIs with the Quad SPI

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CAN 2.0B Active and SDMMC interface

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SWPMI single wire protocol master I/F

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IRTIM Infrared interface

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14-channel DMA controller

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True random number generator

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CRC calculation unit, 96-bit unique ID

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Development support: serial wire debug SWD, JTAG, Embedded Trace Macrocell™