STMicroelectronics STM32L4 MCU User Manual

STM32L4 MCU series Ultra-low-power with performance

Key advantages of STM32L4 series

ULP leader and performance booster

ST thought the STM32L4 architecture to reach 100 MIPS based on its ARM Cortex-M4 core with FPU and ST ART Accelerator™ at 80 MHz while keeping best-in-class, ultra-low-power (ULP) figures.

Innovation

Innovative peripherals are embedded to optimize the BOM cost.

Integration and safety

1 MB of Flash and 320-Kbyte of SRAM with safety and security features, smart and numerous peripherals, advanced and low power analog circuits in packages as small as 2.58 x 3.07 mm.

Great Investment

Great Investment This new STM32 member benefits from the pin-to-pin compatibility of the STM32 family and the STM32 Ecosystem.

Ultra-low-power and flexibility

STM32L4 is optimized to reduce power consumption and increase flexibility

FlexPowerControl

External level shifter no longer needed

Separate V

28uA/MHz using external SMPS

Dedicated V

16 Kbytes of SRAM active in Standby mode

(Communication I/Fs, analog circuits, timers …)

to the core (down to 1.05 V)

supplies (down to 1.08 V)

Down to 200 nA keeping

Wake up MCU with any peripheral

I/O level kept in low-power modes

Optimization of system consumption

Down to 8 nA for I/O wake-up

with additional Shutdown mode

STM32L4

Internal oscillator from 100 kHz to 48 MHz

(±0.25% int. clock accuracy over voltage/temperature with LSE)

RTC available for all power modes

(from Active down to V

2 nA V

Automatic switch to maintain power for RTC and backup registers

USB crystal-less capable

(Dedicated crystal oscillator is no longer needed for USB functions)

mode with charging capability

BAT

)

Best power consumption numbers with full flexibility

Ultra-low-power modes

Wake-up time

250 µs

14 µs

5 µs

4 µs

6 cycles

BAT

Shutdown 8 nA / 200 nA*

Standby 34 nA / 280 nA*

Standby + 8-Kbyte RAM 200 nA / 440 nA*

Stop 2 (full retention) 720 nA / 950 nA*

Stop 1 (full retention) 3.2 µA / 3.4 µA*

Sleep 8 µA/MHz ** / 20 µA/MHz **

Run at 24 MHz 28 µA /MHz ** / 79 µA /MHz

Run at 80 MHz 35 µA/MHz ** / 90µA/MHz

2 nA / 200 nA*

Tamper detection: 2 I/Os, RTC

Wake-up sources: reset pin, 5 I/Os, RTC

Wake-up sources: + BOR, IWDG

Wake-up sources: + all I/Os, PVD, LCD, COMPs, I²C, LPUART, LPTIM

Wake-up sources: + all I²C, UART

Wake-up sources: any interrupt or event

Note : * without RTC / with RTC

** with external SMPS

STM32L4 takes off like a rocket

Dhrystone

100

MIPS

447 ULPMark-CP

167 ULPMark-PP

STM32L4

From 0 to 48 MHz in less than 5 µs

From 0 to 80 MHz in less than 20 µs

RUN

48 MHz

< 5 µs!

RUN

273

80 MHz

STOP mode

Providing more performance

No compromise on performance with STM32L4 MCUs

CoreMark

score

273

Execution performance

from Flash memory

Linear performance thanks to ST ART Accelerator

Competitors: impact of wait states

• Up to 80 MHz/ 100 DMIPS with

Chrom-ART Accelerator™

• Up to 273 CoreMark result

• Arm®Cortex®-M4 with FPU and DSP instructions

• 2x DMA (14 channels)

• SPI up to 40 Mbit/s, USART 10 Mbit/s

CPU frequency

80 MHz

Digital Filter for Sigma

Smart peripherals

metering

Delta Modulators

8 x parallel inputs

with up to 24-bit data output resolution

with RTC

BAT

for battery backup

200 nA in V

32 x 32-bit backup registers

mode

BAT

for RTC and

TRNG & AES

for Security

128-/256-bit AES

key encryption hardware accelerator

External memory interface

for static memories supporting SRAM,

PSRAM, NOR and NAND

FSMC

STM32L4

Electricity/Gas

/ Water

Smart Meter

LCD Display

SPI, Parallel or TFT Interface

Anti Tamper pin

3 x tamper pins for battery domain

SPI / UART/ SDIO

for Wireless

3x SPIs (4x SPIs with the Quad SPI) 6x USARTs (ISO 7816, LIN, IrDA, modem) 1 x SDIO

I/Os

Up to 114 fast I/Os for buttons & relays

+ 14 hidden pages