STM32L471QGI6           Description

  The STM32L471xx device is an ultra-low power microcontroller based on a high-performance ARM Cortex - M4 32-bit RISC core that operates at up to 80 MHz. The Cortex-M4 kernel uses floating-point unit (FPU) single precision and supports all ARM single-precision data processing instructions and data types. It also implements a complete set of DSP instructions and memory protection unit (MPU) to enhance the security of the application. The STM32L471xx device embeds high-speed memory (flash memory up to 1 Mbyte, SRAM up to 128Kbyte), flexible external memory controller (FSMC) for static memory, four-way SPI flash interface (available in all packages), and various enhanced Icano and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix. STM32L471xx devices embed several protection mechanisms for embedded flash memory and SRAM: read protection, write protection, proprietary code read protection and firewall.

STM32L471QGI6                         Features

? Ultra-low-power with FlexPowerControl

– 1.71 V to 3.6 V power supply

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

– 300 nA in VBAT mode: supply for RTC and

32x32-bit backup registers

– 30 nA Shutdown mode (5 wakeup pins)

– 120 nA Standby mode (5 wakeup pins)

– 420 nA Standby mode with RTC

– 1.1 μA Stop 2 mode, 1.4 μA with RTC

– 100 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

– 294 ULPMark? CP score

– 106 ULPMark? PP 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)

– 3 PLLs for system clock, audio, ADC

? Up to 114 fast I/Os, most 5 V-tolerant, up to 14

I/Os with independent supply down to 1.08 V

STM32L471QGI6                 Applications

  The devices support four digital filters for external sigma delta modulators (DFSDM).