意法半導體 STM32L4 32 位 MCU+FPU 是超低功耗微控制器，基于高性能的 ARM®Cortex®-M4 32 位 RISC 內核，工作頻率高達 80MHz。Cortex-M4 內核具有單浮點單元（SFPU）精度，支持所有 ARM 單精度數據處理指令與數據類型。同時執行全套 DSP 指令和存儲保護單元（MPU），增強應用安全性。
The STM32L4 microcontroller is based on a new ultralow-power platform featuring FlexPowerControl. It extends flexibility to reach optimized power consumptions. The STM32L4 outperforms the market in the ultra-low-power domain with an EEMBC ULPBench score of 150 ULPBench™-CP.
It offers up to 2Mbyte of Flash (dual bank) and up to 640Kbytes of SRAM. It delivers 100 DMIPS/273 CoreMark thanks to the ST ART Accelerator™ at 80MHz. The entire system performance is optimized using a multi-AHB bus matrix and DMA controllers.
The STM32L4 microcontroller can be used to replace a current design using the STM32F4 to get low power functionality. It has pin-to-pin compatibility and can replace the STM32F4 without having to change the board layout.
特性
Ultralow-power with FlexPowerControl
1.71V to 3.6V power supply
-40°C to 85/105/125°C temperature range
200nA in VBAT mode: supply for RTC and 32x32-bit backup registers
8nA Shutdown mode (5 wakeup pins)
28nA Standby mode (5 wakeup pins)
280nA Standby mode with RTC
1.0μA Stop 2 mode, 1.28μA Stop 2 with RTC
84μA/MHz run mode
Batch acquisition mode (BAM)
4μs 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 80MHz, MPU, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1), and DSP instructions
Clock Sources
4 to 48MHz crystal oscillator
32kHz crystal oscillator for RTC (LSE)
Internal 16MHz factory-trimmed RC (±1%)
Internal low-power 32kHz RC (±5%)
Internal multispeed 100kHz to 48MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
Internal 48MHz with clock recovery
2 PLLs for system clock, USB, audio, ADC
Performance Benchmark
1.25 DMIPS/MHz (Drystone 2.1)
273.55 Coremark® (3.42 Coremark/MHz @ 80MHz)
Energy Benchmark
176.7 ULPBench® score
Memories
Up to 256KB single bank Flash, proprietary code readout protection
64KB of SRAM including 16KB with hardware parity check
Quad SPI memory interface
Rich analog peripherals (independent supply)
1x12-bit ADC 5Msps, up to 16-bit with hardware oversampling, 200μA/Msps
2x12-bit DAC, low-power sample and hold
1x operational amplifier with built-in PGA
2x ultralow-power comparators
14-channel DMA controller
True random number generator
CRC calculation unit, 96-bit unique ID
AES: 128/256-bit key encryption hardware accelerator
Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
RTC with HW calendar, alarms and calibration
LCD 8×40 or 4×44 with step-up converter
Up to 21 capacitive sensing channels: support touchkey, linear and rotary touch sensors
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
Up to 83 fast I/Os, most 5V-tolerant
STM32L4x5, STM32L4x6, STM32L4x7, STML4x9
Ultra-low-power with FlexPowerControl
1.71V to 3.6V power supply
-40°C to 85/105/125°C temperature range
300nA in VBAT mode: supply for RTC and 32x32-bit backup registers (4nA without RTC)
30nA Shutdown mode (5 wakeup pins)
120nA Standby mode (5 wakeup pins)
420nA Standby mode with RTC
1.1μA Stop 2 mode, 1.4μA Stop 2 with RTC
100μA/MHz run mode
Batch acquisition mode (BAM)
4μs wakeup from Stop 1 mode, 5μs from Stop 2 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 80MHz, MPU, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1), and DSP instructions
Clock Sources
4 to 48MHz crystal oscillator
32kHz crystal oscillator for RTC (LSE)
Internal 16MHz factory-trimmed RC (±1%)
Internal low-power 32kHz RC (±5%)
Internal multispeed 100kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
3 PLLs for system clock, USB, audio, ADC
IoT and Handheld Measurement Uses
RTC with HW calendar, alarms and calibration
LCD 8×40 or 4×44 with step-up converter
16x timers: 2x16-bit advanced motor-control, 2x32-bit and 5x16-bit general purpose, 2x16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
Up to 114 fast I/Os, most 5V-tolerant, up to 14 I/Os with independent supply down to 1.08V
Memories
Up to 2MB Flash, 2 banks read-while-write, proprietary code readout protection
Up to 640KB of SRAM including 32KB with hardware parity check
External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
Quad SPI memory interface
Sensor Polling
4x digital filters for sigma delta modulator
Rich analog peripherals (independent supply)
3×12-bit ADC 5Msps, up to 16-bit with hardware oversampling, 200μA/Msps
2x12-bit DAC, low-power sample and hold
2x operational amplifiers with built-in PGA
2x ultralow-power comparators
Industrial Controls
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™
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