ST STM32L451RET6TR

ARM® Cortex®-M480MHz512KB（512K x 8）

Overview

The STM32L451xx 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 STM32L451xx devices embed high-speed memories (Flash memory up to 512 Kbyte, 160 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 STM32L451xx 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, one DAC channel, 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 STM32L451xx operates in the -40 to +85 °C (+105 °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 STM32L451xx family offers six packages from 48 to 100-pin packages.

Features

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

• RTC with HW calendar, alarms and calibration

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

• 12x timers: 1x 16-bit advanced motor-control, 1x 32-bit and 3x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer

• Memories

– Up to 512 KB single bank Flash, proprietary code readout protection

– 160 KB of SRAM including 32 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

– 1x 12-bit DAC output channels, low-power sample and hold

– 1x operational amplifier with built-in PGA

– 2x ultra-low-power comparators

– Accurate 2.5 V or 2.048 V reference voltage buffered output

• 16x communication interfaces

– 1x SAI (serial audio interface)

– 4x I2C FM+(1 Mbit/s), SMBus/PMBus

– 3x USARTs (ISO 7816, LIN, IrDA, modem)

– 1x UART (LIN, IrDA, modem)

– 1x LPUART (Stop 2 wake-up)

– 3x SPIs (and 1x Quad SPI)

– CAN (2.0B Active) and SDMMC interface

– IRTIM (Infrared interface)

• 14-channel DMA controller

• Ultra-low-power with FlexPowerControl

– 1.71 V to 3.6 V power supply

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

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

– 22 nA Shutdown mode (5 wakeup pins)

– 106 nA Standby mode (5 wakeup pins)

– 375 nA Standby mode with RTC

– 2.05 μA Stop 2 mode, 2.40 μA with RTC

– 84 μA/MHz run mode

– Batch acquisition mode (BAM)

– 4 μs wakeup from Stop mode

– Brown out reset (BOR)

– 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 and DSP instructions

• Performance benchmark

– 1.25 DMIPS/MHz (Drystone 2.1)

– 273.55 CoreMark? (3.42 CoreMark/MHz @ 80 MHz)

• Energy benchmark

– 174.5 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

Applications

• Light sensing & controlling devices

• Temperature sensing and controlling devices

• Fire detection & safety devices

• Industrial instrumentation devices

• Process control devices