●The STM32L471xx 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 STM32L471xx devices embed high-speed memories (Flash memory up to 1 Mbyte, up to 128 Kbyte of SRAM), a flexible external memory controller (FSMC) for static memories (for devices with packages of 100 pins and more), 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 STM32L471xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall.
●The devices offer up to three fast 12-bit ADCs (5 Msps), two comparators, two operational amplifiers, two DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timer, two 16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power timers. The devices support four digital filters for external sigma delta modulators (DFSDM).
●In addition, up to 24 capacitive sensing channels are available.
●They also feature standard and advanced communication interfaces.
●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
● 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 Stop 2 with RTC
● 100 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
● 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
● RTC with HW calendar, alarms and calibration
● Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
● 16x timers: 2 x 16-bit advanced motor-control, 2 x 32-bit and 5 x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
● Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
● Memories
● Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
● Up to 128 KB of SRAM including 32 KB with hardware parity check
● External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
● Quad SPI memory interface
● 4x digital filters for sigma delta modulator
● Rich analog peripherals (independent supply)
● 3× 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 μA/Msps
● 2x 12-bit DAC, low-power sample and hold
● 2x operational amplifiers with built-in PGA
● 2x ultra-low-power comparators
● 17x communication interfaces
● 2x SAIs (serial audio interface)
● 3x I2C FM+(1 Mbit/s), SMBus/PMBus
● 6x 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
● 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™
