STM32 L1 series of ultra-low-power MCUs

ST’s ARM® Cortex®-M3-based STM32 L1 series uses ST’s proprietary ultra-low-leakage process technology with an innovative autonomous dynamic voltage scaling and 5 low-power modes offering unprecedented platform flexibility to fit any application. The STM32 L1 series extends the ultra-low-power concept with no compromise on performance.

As for the STM32 L0 and STM8 L, the STM32 L1 offers dynamic voltage scaling, an ultra-low-power clock oscillator, LCD interface, comparator, DAC and hardware encryption.

More than just ultra-low-power MCUs, the STM32 L1 series offers a wide portfolio of features, memory sizes and package pin counts. Combining ultra-low power and performance, the portfolio covers from 32 to 512 Kbytes of Flash memory (with up to
80 Kbytes of SDRAM and 16 Kbytes of true embedded EEPROM) and from 48 to 144 pins.

This innovative architecture (voltage scaling, ultra-low-power MSI oscillator) gives your design more performance for a very low power budget. The large number of embedded peripherals, such as USB, LCD interface, op amp, comparators, ADC with fast on/off mode, DAC, capacitive touch and AES, makes the STM32 L1 series an expandable platform to fit all your requirements.

The series is available in 4 different lines: STM32L100 Value line, STM32L151, STM32L152 (LCD), STM32L162 (LCD and AES-128).

To simplify migration and give you all the flexibility you need, the STM32 L1 is pin-to-pin compatible with the different STM32 F series and opens the door to the full STM32 ecosystem.

  • Ultra-low-power mode: 280 nA with backup registers (3 wakeup pins)
  • Ultra-low-power mode + RTC: 900 nA with backup registers (3 wakeup pins)
  • Low-power run mode: down to 9 μA
  • Dynamic run mode: down to 177 μA/MHz

Explore ST's complete ecosystem to start developing with STM32L1

Explore ST's complete ecosystem to start developing with STM32L1

Hardware tools

The Nucleo-L152RE board provides an affordable and flexible way for users to try out new ideas and build prototypes with any STM32 microcontroller line, choosing from the various combinations of performance, power consumption and features. 32L100DISCOVERY and 32L152CDISCOVERY discovery kits offer everything required for beginners and experienced users to get started quickly and develop applications easily. The STM32L1  evaluation board offers a complete demonstration and development platform for the STM32L1 series.

Embedded software

STM32CubeL1 is complimentary embedded software including the Hardware Abstraction Layer (HAL) for facilitating migration from any STM32 and a set of middleware components such as FreeRTOS and USB library.

Software tools

STM32CubeMX is a complimentary generator of initialization C-code for STM32 MCUs based on a graphical user interface with in particular the ability to estimate power consumption.


From among all the STM32 toolchains, STM32L1 users can now choose several provided at no charge from leading vendors, such as CooCox CoIDE or Ac6 System Workbench for STM32.


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