STM32L451RET6TR Description
The STM32L451RET6TR device is an ultra-low-power microcontroller built around the powerful 32-bit RISC Arm? Cortex?-M4 core that can operate at up to 80 MHz. A floating point unit (FPU) single precision is a characteristic of the Cortex-M4 core that supports all Arm? single-precision data-processing instructions and data formats. Additionally, it incorporates a memory protection unit (MPU) that improves program security together with the whole range of DSP instructions.
The STM32L451RET6TR device integrates fast memories (Flash memory up to 512 Kbyte, 160 Kbyte of SRAM), a Quad SPI flash memories interface (available on all packages), and a wide array of upgraded I/Os and peripherals connected to two APB buses, two AHB buses, and a 32-bit multi-AHB bus matrix.
The STM32L451RET6TR device includes a number of readout protection, write protection, proprietary code readout protection, and firewall protection techniques for embedded Flash memory and SRAM.
One 16-bit PWM timer specifically designed for motor control, four general-purpose 16-bit timers, two 16-bit low-power timers, a fast 12-bit ADC (5 Msps), two comparators, one operational amplifier, one DAC channel, an internal voltage reference buffer, a low-power RTC, and one general-purpose 32-bit timer are all included in the devices.
Furthermore, there are up to 21 capacitive sensing channels available.
They also have both conventional and cutting-edge communication interfaces.
STM32L451RET6TR 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
– 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
– 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)
– 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)
– 174.5 ULPBench? score
– 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
STM32L451RET6TR Applications
Light sensing & controlling devices
Temperature sensing and controlling devices
Fire detection & safety devices
Industrial instrumentation devices
Process control devices
