Affordable and flexible platform to ease prototyping using a STM32L073RZT6 microcontroller.


The STM32 Nucleo 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.

The Arduino™ connectivity support and ST Morpho headers make it easy to expand the functionality of the STM32 Nucleo open development platform with a wide choice of specialized shields.

The STM32 Nucleo board does not require any separate probe as it integrates the ST-LINK/V2-1 debugger/programmer.

Microcontroller features

  • STM32L073RZT6 in LQFP64 package
  • ARM®32-bit Cortex®-M0+ CPU
  • 32 MHz max CPU frequency
  • VDD from 1.65 V to 3.6 V
  • 192 KB Flash
  • 20 KB SRAM
  • GPIO (51) with external interrupt capability
  • General purpose Timers (4)
  • Basic Timers (2)
  • Low-power Timer
  • SPI (2)
  • I2S
  • I2C (3)
  • USART (4)
  • Low-power UART
  • USB 2.0 full-speed
  • 12-bit ADC with 16 channels
  • 12-bit DAC (2) with 1 channel each
  • LCD
  • Comparators (2)
  • RTC
  • Capacitive sensing channels (24)
  • Random Generator (TRNG for HW entropy)

Nucleo features

  • Two types of extension resources
    • Arduino Uno Revision 3 connectivity
    • STMicroelectronics Morpho extension pin headers for full access to all STM32 I/Os
  • On-board ST-LINK/V2-1 debugger/programmer with SWD connector
    • Selection-mode switch to use the kit as a standalone ST-LINK/V2-1
  • Flexible board power supply
    • USB VBUS or external source (3.3 V, 5 V, 7 - 12 V)
    • Power management access point
  • User LED (LD2)
  • Two push buttons: USER and RESET
  • USB re-enumeration capability: three different interfaces supported on USB
    • Virtual Com port
    • Mass storage (USB Disk drive) for drag'n'drop programming
    • Debug port

Board pinout

Pins Legend


You can find more details on the available pins and labels in the PeripheralPins.c and PinNames.h files.

These files can be found in:

  • ARMmbed/mbed-os repository on GitHub (up-to-date version, used with mbed CLI commands)

  • mbed-dev library in (source files of the mbed library used on mbed compiler IDE)

Arduino-compatible headers

/media/uploads/bcostm/nucleo_l073rz_2017_9_22_ard_left.png /media/uploads/bcostm/nucleo_l073rz_2017_9_22_ard_right.png

Morpho headers

These headers give access to all STM32 pins. /media/uploads/bcostm/nucleo_l073rz_2017_9_22_mor_left.png /media/uploads/bcostm/nucleo_l073rz_2017_9_22_mor_right.png

Supported shields

ST X-NUCLEO boards

See Matrix of tested boards.

Other Non-ST boards

See here.

Getting started

Nucleo ST-LINK/V2 driver installation and firmware upgrade

  • Install the ST-LINK/V2 driver before connecting the Nucleo board to your PC the first time. Follow this LINK for all details.
  • For optimum performances, ensure that the Nucleo ST-LINK/V2 firmware is upgraded to the latest version. Follow this LINK for all details.

Technical references

For more information, please refer to:

Known limitations

The following section describes known limitations of the platform. Note that general issues are tracked into the mbed repository available on GitHub.

  • On Nucleo 64-pins boards, the D0 and D1 pins are not available per default as they are used by the STLink Virtual Comm Port. More information HERE

Tips and Tricks

Find more information in ST WIKI pages.

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