STM32

STM32 Family^[1]

STM32H7 series IC
General information
Launched	2007
Discontinued	Current
Designed by	STMicroelectronics
Performance
Max. CPU clock rate	24  to 800 MHz
Architecture and classification
Technology node	180 to 40 nm
Microarchitecture	ARM Cortex-M0,[2] ARM Cortex-M0+,[3] ARM Cortex-M3,[4] ARM Cortex-M4,[5] ARM Cortex-M7,[6] ARM Cortex-M33[7] ARM Cortex-M55[8] ARM Cortex-M85[9]

STM32 is a family of 32-bit microcontroller and microprocessor integrated circuits by STMicroelectronics. STM32 microcontrollers are grouped into related series that are based around the same 32-bit ARM processor core: Cortex-M0, Cortex-M0+, Cortex-M3, Cortex-M4, Cortex-M7, Cortex-M33, Cortex-M55, or Cortex-M85. Internally, each microcontroller consists of ARM processor core(s), flash memory, static RAM, a debugging interface, and various peripherals.^[1]

In addition to its microcontroller lines, STMicroelectronics has introduced microprocessor (MPU) offerings such as the MP1 and MP2 series into the STM32 family. These processors are based around single or dual ARM Cortex-A cores combined with an ARM Cortex-M core.^[10] Cortex-A application processors include a memory management unit (MMU),^[11] enabling them to run advanced operating systems such as Linux.

The STM32 family of the microcontroller ICs is based on various 32-bit RISC ARM Cortex-M cores.^[1] STMicroelectronics licenses the ARM Processor IP from ARM Holdings and integrates them with custom-designed peripherals to create complete microcontroller solutions. Each STM32 microcontroller is designed for specific performance, power efficiency, and feature requirements, making them suitable for a wide range of embedded applications. The following tables summarize the STM32 family of microcontrollers (MCUs) and microprocessors (MPUs).

STM32 microcontrollers (MCUs)

Series	ARM CPU core(s)	Target
C0	Cortex-M0+[12]	Low-cost
C5	Cortex-M33F[13]	Low-cost
F0	Cortex-M0[14]	Mainstream
F1	Cortex-M3[15]	Mainstream
F2	Cortex-M3[16]	High-performance
F3	Cortex-M4F[17]	Mixed-signal processing
F4	Cortex-M4F[18]	High-performance
F7	Cortex-M7F[19]	High-performance
G0	Cortex-M0+[20]	Mainstream, Low Cost
G4	Cortex-M4F[21]	Mixed-signal processing
H5	Cortex-M33F[22]	High-performance, security
H7	Cortex-M7F (single), or Cortex-M7F and Cortex-M4F[23]	High-performance
L0	Cortex-M0+[24]	Low-power
L1	Cortex-M3[25]	Low-power
L4	Cortex-M4F[26]	Low Power
L4+	Cortex-M4F[27]	Low-power
L5	Cortex-M33F[28]	Low-power, security
N6	Cortex-M55F[29] and NPU	High-performance (Machine learning inference)
U0	Cortex-M0+[30]	Low-power
U3	Cortex-M33F	Low-power, security
U5	Cortex-M33F[31]	Low-power, security
V8	Cortex-M85F[32]	High-performance, security
WB0	Cortex-M0+[33]	Wireless (Bluetooth LE)
WB	Cortex-M4F and Cortex-M0+[34]	Wireless (Bluetooth LE, IEEE 802.15.4)
WBA	Cortex-M33F[35]	Wireless (Bluetooth LE, IEEE 802.15.4), security
WL	Cortex-M4 and/or Cortex-M0+[36]	Wireless (LoRa, sub-GHz)

STM32 microprocessors (MPUs)

Series	ARM CPU core(s)	Target
MP1	Single or Dual Cortex-A7 and optionally Cortex-M4[37]	Embedded Linux, industrial, IoT
MP2	Dual Cortex-A35 Cores + Cortex-M33[38]	High-performance, machine learning, advanced HMI

The STM32 is the third ARM family by STMicroelectronics. It follows their earlier STR9 family based on the ARM9E core,^[39] and STR7 family based on the ARM7TDMI core.^[40] The following is the history of how the STM32 family has evolved.

Date	Announcement
October 2006	STMicroelectronics licensed the ARM Cortex-M3 core
June 2007	ST announced the STM32 F1-series based on the ARM Cortex-M3
October 2009	ST announced new ARM chips would be built using the 90 nm process
April 2010	ST announced the STM32 L1-series chips
November 2010	ST announced the STM32 F2-series chips based on the ARM Cortex-M3 core, and future development
March 2011	ST announced the expansion of their STM32 L1-series chips with flash densities of 256 KB and 384 KB
September 2011	ST announced the STM32 F4-series chips based on the ARM Cortex-M4F core
February 2012	ST announced the STM32 F0-series chips based on the ARM Cortex-M0 core
June 2012	ST announced the STM32 F3-series chips based on the ARM Cortex-M4F core
January 2013	ST announced full Java support for STM32 F2 and F4-series chips
February 2013	ST announced STM32 Embedded Coder support for MATLAB and Simulink
February 2013	ST announced the STM32 F4x9-series chips
April 2013	ST announced the STM32 F401-series chips
July 2013	ST announced the STM32 F030-series chips and availability in a TSSOP20 package
December 2013	ST announced that it is joining the mbed project
January 2014	ST announced the STM32 F0x2-series chips
February 2014	ST announced the STM32 L0-series chips based on the ARM Cortex-M0+ core
February 2014	ST announced multiple STM32 Nucleo boards with Arduino headers and mbed IDE
February 2014	ST announced the release of free STM32Cube software tool with graphical configurator and C code
September 2014	ST announced the STM32 F7 series, the first chips based on the Cortex-M7F core
October 2016	STM32H7 series announced, based on ARM Cortex-M7F core, produced using 40 nm technology, runs at 400 MHz
November 2017	STM32L4+ series announced, an upgrade to STM32L4 series Cortex-M4 MCUs
October 2018	STM32L5 series announced, ultra-low-power MCUs based on ARM Cortex-M33 core with various security features
February 2021	STM32U5 series announced, ultra-low-power MCUs based on ARM Cortex-M33 core with low power and hardware & software-based security measures targeting PSA Certified and SESIP assurance level 3 with physical attacker resistance
January 2023	STM32C0 series announced, based on ARM Cortex-M0+ core, targeting equipment like home appliances, industrial pumps, fans, smoke detectors, typically served by simpler 8-bit and 16-bit MCUs.
March 2023	STM32H5 series announced, based on ARM Cortex-M33 core, designed for smart, connected devices, which provide more intelligence “in the edge” and also strengthens defenses against attacks on IoT assets.
March 2024	STM32U0 series announced, based on ARM Cortex-M0+ core, targeting ultra-low power entry-level battery-powered applications in industrial, medical, smart metering, and consumer wellness markets.
March 2026	STM32C5 with Cortex-M33, increased performance with cost efficiency and enhanced end-device capabilities. Aiming at comsumer and professional devices.

The STM32 family consists of many series of microcontrollers.^[1] Each STM32 microcontroller series is based upon a specific ARM Cortex-M processor core.

STM32 C0 series^[41]

General information
Launched	2023[42]
Discontinued	current
Performance
Max. CPU clock rate	48
Architecture and classification
Microarchitecture	ARM Cortex-M0+[3]
Instruction set	Thumb-1 (most), Thumb-2 (some)

The STM32 C0-series is an entry-level low-cost STM32-series of microcontrollers:

• ARM Cortex-M0+ core at a maximum clock rate of 48 MHz.

STM32 F0 series^[43]

General information
Launched	2012
Discontinued	current
Performance
Max. CPU clock rate	48 MHz
Architecture and classification
Technology node	180 nm[44]
Microarchitecture	ARM Cortex-M0[2]
Instruction set	Thumb-1 (most), Thumb-2 (some)

The STM32 F0-series are the first group of ARM Cortex-M0 chips in the STM32 family. The summary for this series is:^{[45][46][47][43]}

• Core:
  • ARM Cortex-M0 core at a maximum clock rate of 48 MHz.
  • Cortex-M0 options include the SysTick Timer.
• Memory:
  • Static RAM consists of 4 / 6 / 8 / 16 / 32 KB general purpose with hardware parity checking.
  • Flash consists of 16 / 32 / 64 / 128 / 256 KB general purpose.
  • Each chip has a factory-programmed 96-bit unique device identifier number. (except STM32F030x4/6/8/C and STM32F070x6/B,^[48])
• Peripherals:
  • Each F0-series includes various peripherals that vary from line to line.
• Oscillators consists of internal (8 MHz, 40 kHz), optional external (1 to 32 MHz, 32.768 to 1000 kHz).
• IC packages: TSSOP20, UFQFPN32, LQFP/UFQFN48, LQFP64, LQFP/UFBGA100.
• Operating voltage range is 2.0 to 3.6 volt with the possibility to go down to 1.65 V.

STM32 F1 series^[49]

General information
Launched	2007
Discontinued	current
Performance
Max. CPU clock rate	24  to 72 MHz
Architecture and classification
Microarchitecture	ARM Cortex-M3[4]
Instruction set	Thumb-1, Thumb-2, Saturated (some)

The STM32 F1-series was the first group of STM32 microcontrollers based on the ARM Cortex-M3 core and considered their mainstream ARM microcontrollers. The F1-series has evolved over time by increasing CPU speed, size of internal memory, variety of peripherals. There are five F1 lines: Connectivity (STM32F105/107), Performance (STM32F103), USB Access (STM32F102), Access (STM32F101), Value (STM32F100). The summary for this series is:^[49][50][51]

• Core:
  • ARM Cortex-M3 core at a maximum clock rate of 24 / 36 / 48 / 72 MHz.
• Memory:
  • Static RAM consists of 4 / 6 / 8 / 10 / 16 / 20 / 24 / 32 / 48 / 64 / 80 / 96 KB.
  • Flash consists of 16 / 32 / 64 / 128 / 256 / 384 / 512 / 768 / 1024 KB.
• Peripherals:
  • Each F1-series includes various peripherals that vary from line to line.
• IC packages: VFQFPN36, VFQFPN48, LQFP48, WLCSP64, TFBGA64, LQFP64, LQFP100, LFBGA100, LQFP144, LFBGA144.

STM32 F2 series^[52]

General information
Launched	2010
Discontinued	current
Performance
Max. CPU clock rate	120 MHz
Architecture and classification
Technology node	90 nm
Microarchitecture	ARM Cortex-M3[4]
Instruction set	Thumb-1, Thumb-2, Saturated (some)

The STM32 F2-series of STM32 microcontrollers based on the ARM Cortex-M3 core. It is the most recent and fastest Cortex-M3 series. The F2 is pin-to-pin compatible with the STM32 F4-series. The summary for this series is:^[53][52][54]

• Core:
  • ARM Cortex-M3 core at a maximum clock rate of 120 MHz.
• Memory:
  • Static RAM consists of 64 / 96 / 128 KB general purpose, 4 KB battery-backed, 80 bytes battery-backed with tamper-detection erase.
  • Flash consists of 128 / 256 / 512 / 768 / 1024 KB general purpose, 30 KB system boot, 512 bytes one-time programmable (OTP), 16 option bytes.
  • Each chip has a factory-programmed 96-bit unique device identifier number.
• Peripherals:
  • Common peripherals included in all IC packages are USB 2.0 OTG HS, two CAN 2.0B, one SPI + two SPI or I²S, three I²C, four USART, two UART, SDIO/MMC, twelve 16-bit timers, two 32-bit timers, two watchdog timers, temperature sensor, 16 or 24 channels into three ADCs, two DACs, 51 to 140 GPIOs, sixteen DMA, real-time clock (RTC), cyclic redundancy check (CRC) engine, random number generator (RNG) engine. Larger IC packages add 8/16-bit external memory bus capabilities.
  • The STM32F2x7 models add Ethernet MAC, camera interface, USB 2.0 OTG FS.
  • The STM32F21x models add a cryptographic processor for DES / TDES / AES, and a hash processor for SHA-1 and MD5.
• Oscillators consists of internal (16 MHz, 32 kHz), optional external (4 to 26 MHz, 32.768 to 1000 kHz).
• IC packages: WLCSP64, LQFP64, LQFP100, LQFP144, LQFP176, UFBGA176.
• Operating voltage range is 1.8 to 3.6 volt.

STM32 F3 series^[55]

General information
Launched	2015
Discontinued	current
Performance
Max. CPU clock rate	72 MHz to 72 MHz
Architecture and classification
Microarchitecture	ARM Cortex-M4F[5]
Instruction set	Thumb-1, Thumb-2, Saturated, DSP, FPU (SP)

The STM32 F3-series is the second group of STM32 microcontrollers based on the ARM Cortex-M4F core. The F3 is almost pin-to-pin compatible with the STM32 F1-series. The summary for this series is:^[56][57][55]

• Core:
  • ARM Cortex-M4F core at a maximum clock rate of 72 MHz.
• Memory:
  • Static RAM consists of 16 / 24 / 32 / 40 KB general purpose with hardware parity check, 0 / 8 KB core coupled memory (CCM) with hardware parity check, 64 / 128 bytes battery-backed with tamper-detection erase.
  • Flash consists of 64 / 128 / 256 KB general purpose, 8 KB system boot, and option bytes.
  • Each chip has a factory-programmed 96-bit unique device identifier number.
• Peripherals:
  • Each F3-series includes various peripherals that vary from line to line.
• Oscillators consists of internal (8 MHz, 40 kHz), optional external (1 to 32 MHz, 32.768 to 1000 kHz).
• IC packages: LQFP48, LQFP64, LQFP100, UFBGA100.
• Operating voltage range is 2.0 to 3.6 volt.

The distinguishing feature for this series is presence of four fast, 12-bit, simultaneous sampling ADCs (multiplexer to over 30 channels), and four matched, 8 MHz bandwidth op-amps with all pins exposed and additionally internal PGA (Programmable Gain Array) network. The exposed pads allow for a range of analog signal conditioning circuits like band-pass filters, anti-alias filters, charge amplifiers, integrators/differentiators, 'instrumentation' high-gain differential inputs, and other. This eliminates need for external op-amps for many applications. The built-in two-channel DAC has arbitrary waveform as well as a hardware-generated waveform (sine, triangle, noise etc.) capability. All analog devices can be completely independent, or partially internally connected, meaning that one can have nearly everything that is needed for an advanced measurement and sensor interfacing system in a single chip.

The four ADCs can be simultaneously sampled making a wide range of precision analog control equipment possible. It is also possible to use a hardware scheduler for the multiplexer array, allowing good timing accuracy when sampling more than 4 channels, independent of the main processor thread. The sampling and multiplexing trigger can be controlled from a variety of sources including timers and built-in comparators, allowing for irregular sampling intervals where needed.

STM32F37/38xxx integrate a 14-effective number of bits delta-sigma ADC.^[58]

The op-amps inputs feature 2-to-1 analog multiplexer, allowing for a total of eight analog channels to be pre-processed using the op-amp; all the op-amp outputs can be internally connected to ADCs.

STM32 F4 Series^[59]

General information
Launched	2011
Discontinued	current
Performance
Max. CPU clock rate	84  to 180 MHz
Architecture and classification
Technology node	90 nm
Microarchitecture	ARM Cortex-M4F[5]
Instruction set	Thumb-1, Thumb-2, Saturated, DSP, FPU (SP)

The STM32 F4-series is the first group of STM32 microcontrollers based on the ARM Cortex-M4F core. The F4-series is also the first STM32 series to have DSP and floating-point instructions. The F4 is pin-to-pin compatible with the STM32 F2-series and adds higher clock speed, 64 KB CCM static RAM, full-duplex I²S, improved real-time clock, and faster ADCs. The summary for this series is:^{[60][61][62][59][63]}

• Core:
  • ARM Cortex-M4F core at a maximum clock rate of 84 / 100 / 168 / 180 MHz.
• Memory:
  • Static RAM consists of up to 192 KB general-purpose, 64 KB core-coupled memory (CCM), 4 KB battery-backed, 80 bytes battery-backed with tamper-detection erase.
  • Flash consists of 512 / 1024 / 2048 KB general-purpose, 30 KB system boot, 512 bytes one-time programmable (OTP), 16 option bytes.
  • Each chip has a factory-programmed 96-bit unique device identifier number.
• Peripherals:
  • Common peripherals included in all IC packages are USB 2.0 OTG HS and FS, two CAN 2.0B, one SPI + two SPI or full-duplex I²S, three I²C, four USART, two UART, SDIO for SD/MMC cards, twelve 16-bit timers, two 32-bit timers, two watchdog timers, temperature sensor, 16 or 24 channels into three ADCs, two DACs, 51 to 140 GPIOs, sixteen DMA, improved real-time clock (RTC), cyclic redundancy check (CRC) engine, random number generator (RNG) engine. Larger IC packages add 8/16-bit external memory bus capabilities.
    • Digital filter for sigma-delta modulators (DFSDM) interface in STM32F412 and STM32F413/423 lines^[64]
  • The STM32F4x7 models add Ethernet MAC and camera interface.
  • The STM32F41x/43x models add a cryptographic processor for DES / TDES / AES, and a hash processor for SHA-1 and MD5.
  • The STM32F4x9 models add a LCD-TFT controller.
• Oscillators consists of internal (16 MHz, 32 kHz), optional external (4 to 26 MHz, 32.768 to 1000 kHz).
• IC packages: WLCSP64, LQFP64, LQFP100, LQFP144, LQFP176, UFBGA176. STM32F429/439 also offers LQFP208 and UFBGA216.
• Operating voltage range is 1.8 to 3.6 volt.

STM32 F7 series^[65]

General information
Launched	2014
Discontinued	current
Performance
Max. CPU clock rate	216 MHz
Architecture and classification
Technology node	90nm
Microarchitecture	ARM Cortex-M7F
Instruction set	Thumb-1, Thumb-2, Saturated, DSP, FPU (SP & DP)

The STM32 F7-series is a group of STM32 microcontrollers based on the ARM Cortex-M7F core. Many of the F7 series are pin-to-pin compatible with the STM32 F4-series.

Core:

• ARM Cortex-M7F core at a maximum clock rate of 216 MHz.

Many of STM32F76xxx and STM32F77xxx models have a digital filter for sigma-delta modulators (DFSDM) interface.^[64]

STM32 G0 series^[66]

General information
Launched	2018
Discontinued	current
Performance
Max. CPU clock rate	64 MHz
Architecture and classification
Technology node	90 nm[44]
Microarchitecture	ARM Cortex-M0+[3]
Instruction set	Thumb-1 (most), Thumb-2 (some)

The STM32 G0-series is a next generation of Cortex-M0/M0+ microcontrollers for budget market segment, offering the golden mean in productivity and power efficiency, e.g. better power efficiency and performance compared to the older F0 series and higher performance compared to ultra low power L0 series^[44]

• Core:
  • ARM Cortex-M0+ core at a maximum clock rate of 64 MHz.
  • Debug interface is SWD with breakpoints and watchpoints. JTAG debugging isn't supported.
• Memory:
  • Static RAM sizes of 8 to 128 KB general purpose with hardware parity checking and up to 144 KB without hardware parity checking, 5x 32-bit battery-backed registers with tamper-detection erase.
  • Flash sizes of 16 to 512 KB.^[67]

STM32 G4 series^[68]

General information
Launched	2019
Discontinued	current
Performance
Max. CPU clock rate	170 MHz
Architecture and classification
Technology node	90 nm[44]
Microarchitecture	ARM Cortex-M4F[5]
Instruction set	Thumb-1, Thumb-2, Saturated, DSP, FPU (SP)

The STM32 G4-series is a next generation of Cortex-M4F microcontrollers aiming to replace F3 series, offering the golden mean in productivity and power efficiency, e.g. better power efficiency and performance compared to the older F3/F4 series and higher performance compared to ultra low power L4 series, integrated several hardware accelerators.

• Core:
  • ARM Cortex-M4F core at a maximum clock rate of 170 MHz with FPU and DSP instructions
• Mathematical accelerators:
  • CORDIC (trigonometric and hyperbolic functions)
  • FMAC (filtering functions)
• Memory:
  • Flash memory with error-correcting code (ECC) and sizes of 128 to 512 KB.
  • Static RAM sizes of 32 to 128 KB with hardware parity checking and CCM-SRAM routine booster, 32x 32-bit battery-backed registers with tamper-detection erase.
• Rich advanced analog peripherals (comparator, op-amps, DAC)
• ADC with hardware oversampling (16-bit resolution) up to 4 Msps
• High-resolution timer version 2
• USB Type-C interface with Power Delivery including physical layer (PHY)
• Securable memory area
• AES hardware encryption

STM32 H7 series^[69]

General information
Launched	2017
Performance
Max. CPU clock rate	480 MHz to 600
Architecture and classification
Technology node	40nm[70]
Microarchitecture	ARM Cortex-M7F + optional ARM Cortex-M4F
Instruction set	Thumb-1, Thumb-2, Saturated, DSP, FPU (SP & DP)

The STM32 H7-series is a group of high performance STM32 microcontrollers based on the ARM Cortex-M7F core with double-precision floating point unit and optional second Cortex-M4F core with single-precision floating point. Cortex-M7F core can reach working frequency up to 600 MHz, while Cortex-M4F - up to 240 MHz. Each of these cores can work independently or as master/slave core.

The STM32H7 Series is the first series of STM32 microcontrollers in 40 nm process technology and the first series of ARM Cortex-M7-based microcontrollers which is able to run up to 600 MHz, allowing a performance boost versus previous series of Cortex-M microcontrollers, reaching new performance records of 1284 DMIPS and 3174 CoreMark. ^[71]

STM32 L0 series^[72]

General information
Launched	2014
Discontinued	current
Performance
Max. CPU clock rate	32 MHz
Architecture and classification
Microarchitecture	ARM Cortex-M0+[3]
Instruction set	Thumb-1 (most), Thumb-2 (some)

The STM32 L0-series is the first group of STM32 microcontrollers based on the ARM Cortex-M0+ core. This series targets low power applications. The summary for this series is:^[73][72]

• Core:
  • ARM Cortex-M0+ core at a maximum clock rate of 32 MHz.
  • Debug interface is SWD with breakpoints and watchpoints. JTAG debugging isn't supported.
• Memory:
  • Static RAM sizes of 8 KB general purpose with hardware parity checking, 20 bytes battery-backed with tamper-detection erase.
  • Flash sizes of 32 or 64 KB general purpose (with ECC).
  • EEPROM sizes of 2 KB (with ECC).
  • ROM which contains a boot loader with optional reprogramming of the flash from USART1, USART2, SPI1, SPI2.
  • Each chip has a factory-programmed 96-bit unique device identifier number.
• Peripherals:
  • two USART, one low-power UART, two I²C, two SPI or one I²S, one full-speed USB (only L0x2 and L0x3 chips).
  • one 12-bit ADC with multiplexer, one 12-bit DAC, two analog comparators, temperature sensor.
  • timers, low-power timers, watchdog timers, 5 V-tolerant GPIOs, real-time clock, DMA controller, CRC engine.
  • capacitive touch sense and 32-bit random number generator (only L0x2 and L0x3 chips), LCD controller (only L0x3 chips), 128-bit AES engine (only L06x chips).
• Oscillators consists of optional external 1 to 24 MHz crystal or oscillator, optional external 32.768 kHz crystal or ceramic resonator, multiple internal oscillators, and one PLL.
• IC packages are LQFP48, LQFP64, TFBGA64.
• Operating voltage range is 1.8 to 3.6 volt, including a programmable brownout detector.

STM32 L1 series^[74]

General information
Launched	2010
Discontinued	current
Performance
Max. CPU clock rate	32 MHz
Architecture and classification
Technology node	130 nm
Microarchitecture	ARM Cortex-M3[4]
Instruction set	Thumb-1, Thumb-2, Saturated (some)

The STM32 L1-series was the first group of STM32 microcontrollers with a primary goal of ultra-low power usage for battery-powered applications. The summary for this series is:^{[75][76][74][77]}

• Core:
  • ARM Cortex-M3 core at a maximum clock rate of 32 MHz.
• Memory:
  • Static RAM consists of 10 / 16 / 32 / 48 / 80 KB general purpose, 80 bytes with tamper-detection erase.
  • Flash consists of 32 / 64 / 128 / 256 / 384 / 512 KB general purpose with ECC, 4 / 8 KB system boot, 32 option bytes, EEPROM consists of 4 / 8 / 12 / 16 KB data storage with ECC.
  • Each chip has a factory-programmed 96-bit unique device identifier number.
• Peripherals:
  • Common peripherals included in all IC packages are USB 2.0 FS, two SPI, two I²C, three USART, eight 16-bit timers, two watchdog timers, temperature sensor, 16 to 24 channels into one ADC, two DACs, 37 to 83 GPIOs, seven DMA, real-time clock (RTC), cyclic redundancy check (CRC) engine. The STM32FL152 line adds a LCD controller.
• Oscillators consists of internal (16 MHz, 38 kHz, variable 64 kHz to 4 MHz), optional external (1 to 26 MHz, 32.768 to 1000 kHz).
• IC packages: UFQFPN48, LQFP48, LQFP64, TFBGA64, LQFP100, UFBGA100.
• Operating voltage range is 1.65 to 3.6 volt.

STM32 L4 series

General information
Launched	2015
Discontinued	current
Performance
Max. CPU clock rate	80 MHz
Architecture and classification
Technology node	90 nm[44]
Microarchitecture	ARM Cortex-M4F[5]
Instruction set	Thumb-1, Thumb-2, Saturated, DSP, FPU (SP)

The STM32 L4-series is an evolution of STM32L1-series of ultra-low power microcontrollers. An example of L4 MCU is STM32L432KC in UFQFPN32 package, that has:

• ARM 32-bit Cortex-M4 core
• 80 MHz max CPU frequency
• VDD from 1.65 V to 3.6 V
• 256 KB Flash, 64 KB SRAM
• General purpose timers (4), SPI/I2S (2), I2C (2), USART (2), 12-bit ADC with 10 channels (1), GPIO (20) with external interrupt capability, RTC
• Random number generator (TRNG for HW entropy).
• Digital filter for sigma-delta modulators (DFSDM) interface^[64]

STM32 L4+ series^[78]

General information
Launched	2016
Discontinued	current
Max. CPU clock rate	to 120 MHz
Architecture and classification
Technology node	90 nm[44]
Microarchitecture	ARM Cortex-M4F[5]
Instruction set	Thumb-1, Thumb-2, Saturated, DSP, FPU (SP)

The STM32 L4+-series is expansion of STM32L4-series of ultra-low power microcontrollers, providing more performance, more embedded memory and richer graphics and connectivity features while keeping ultra-low-power capability.

Main features:

• ARM 32-bit Cortex-M4 core
• 120 MHz max CPU frequency
• VDD from 1.71 V to 3.6 V
• Ultra low power consumption: down to 41 μA/MHz, 20 nA power consumption in power-down mode.
• Up to 2048 KB Flash, up to 640 KB SRAM
• Advanced peripherals, including TFT-LCD controller, Chrom-ART Accelerator, Camera interface etc.
• Digital filter for sigma-delta modulators (DFSDM) interface^[64]

STM32 L5 series^[79]

General information
Launched	2018
Discontinued	current
Performance
Max. CPU clock rate	110 MHz
Architecture and classification
Technology node	90 nm[80]
Microarchitecture	ARM Cortex-M33F

The STM32 L5-series is an evolution of STM32L-series of ultra-low power microcontrollers:

• ARM Cortex-M33 32-bit core
• 110 MHz max CPU frequency

STM32 U0 series^[81]

General information
Launched	2024
Discontinued	current
Performance
Max. CPU clock rate	56
Architecture and classification
Technology node	90 nm[82]
Microarchitecture	ARM Cortex-M0+[3]
Instruction set	Thumb-1 (most), Thumb-2 (some)

The STM32 U0-series is an entry-level addition to the STM32-series of ultra-low power microcontrollers:

• ARM Cortex-M0+ core at a maximum clock rate of 56 MHz.
• Static consumption of 160 nA in standby mode with RTC (Real-Time Clock) and 16 nA in shutdown.
• Up to 256KB of Flash, package options up to 81 pins.
• Integrated LCD segment display controller.
• Targets SESIP Level 3, PSA-Certified Level 1, and NIST certifications.

STM32 U3 series^[83]

General information
Launched	2025[84]
Discontinued	current
Performance
Max. CPU clock rate	96
Architecture and classification
Technology node	40 nm
Microarchitecture	ARM Cortex-M33

The STM32 U3-series is a near-threshold design of ultra-low power microcontrollers that shares similarities with the U5:

• ARM Cortex-M33 32-bit core with 96 MHz max CPU frequency
• 40-nm process node with down to 16 μA/MHz in active mode, 110 nA in low power mode
• Up to 1 MB of flash memory.
• Up to 256 KB of SRAM.
• TrustZone

STM32 U5 series^[85]

General information
Launched	2021
Discontinued	current
Performance
Max. CPU clock rate	160
Architecture and classification
Technology node	40 nm[80]
Microarchitecture	ARM Cortex-M33F

The STM32 U5-series is an evolution of STM32L-series of ultra-low power microcontrollers:

• ARM Cortex-M33 32-bit core with 160 MHz max CPU frequency
• 40-nm process node with down to 16 μA/MHz in active mode, 110 nA in low power mode
• Up to 4 MB of flash memory.
• Up to 3 MB of SRAM.
• Advanced Vector Graphic GPU (NeoChromVG).

The following boards have Arduino Nano pin-compatible male pin headers with 0.6-inch row-to-row DIP-30 footprint, but these boards have 3.3 volt logic I/O, instead of 5 volt logic I/O for an Arduino Nano "R3" and Nano R4.

• Blue Pill board has a STM32F103C8T6 microcontroller.^[86][87][88] Unfortunately, most blue pill boards now contain a fake STM32 from China.^[89]
• Black Pill board has a STM32F401CCU6 or STM32F411CEU6 microcontroller.^[90][91][92]
• ST Nucleo-32 boards have Arduino Nano pin-compatible male pin headers too.^[93] (see Nucleo section below)

The following boards have Arduino Uno R3 pin-compatible female pin headers for Arduino shields, but these boards have 3.3 volt logic I/O, instead of 5 volt logic I/O for an Arduino Uno.

• Maple board by Leaflabs has a STM32F103RB microcontroller. A C/C++ library called libmaple is available to make it easier to migrate from Arduino.
• OLIMEXINO-STM32 board by Olimex has a STM32F103RBT6 microcontroller and similar to the Maple board.
• Netduino with support for .NET Micro Framework.
• ST Nucleo-64 and Nucleo-144 boards have female pin headers for Arduino shields too. (see Nucleo section below)

There are three Nucleo board types, each supporting a different STM32 IC package footprint.^[94] As of fall 2025, there were over eighty Nucleo board variations: 9 of Nucleo-32, 39 of Nucleo-64, 28 of Nucleo-144; 1 obsolete Nucleo-32, 5 obsolete Nucleo-144.

All Nucleo boards by STMicroelectronics have an additional onboard ST-LINK host adapter chip which supplies SWD debugging, virtual COM port, and mass storage over USB.^[94] The debugger embedded on Nucleo boards can be converted to the SEGGER J-Link debugger protocol.^[95] Though some STM32 microcontrollers have a real-time clock (RTC) peripheral and/or battery-back SRAM, none of the Nucleo boards have a battery holder.

Nucleo-32

Nucleo-32 boards^[94][96] have 32-pin STM32 ICs and Arduino Nano pin-compatible male pin headers with 0.6-inch row-to-row DIP-30 footprint.^[97] The unlisted Nucleo-F301K8 is obsolete.

Nucleo-64

Nucleo-64 boards^[94][98] have 64-pin STM32 ICs (except Nucleo-C031C6 and Nucleo-C051C8 have 48-pin ICs), Arduino Uno R3 female headers for shields, ST Morpho male pin headers (two 19x2), some board have a second USB connector, one board (NUCLEO-C092RC) has a CAN-FD bus connector.^[99]

Nucleo-144

Nucleo-144 boards^[94][100] have 144-pin STM32 ICs (except Nucleo-H7S3L8 has 225-pin IC and Nucleo-N657X0-Q has 264-pin IC), Arduino Uno R3 female headers for shields, ST Zio female headers, ST Morpho male pin headers (two 19x2), some have a second USB connector, some have a RJ45 Ethernet connector.^[99] The unlisted Nucleo-F429ZI, Nucleo-F746ZG, Nucleo-H743ZI, Nucleo-H743ZI2, Nucleo-H745ZI-Q are obsolete.

Table

The following table compares various features of official Nucleo boards from STMicroelectronics.^[94] The left half of the table contains details about each board, the right half of the table contains details about the microcontroller (MCU) on each board. Table columns can be sorted by clicking on the arrows in the top row.

Various terms have been shortened or simplified to reduce the column widths: mini means miniUSB, micro means microUSB, conn means connector, dev means device. The suffixes MHz and KB have been moved to the top row. The Nucleo board types have been reduced to numeric values. See "Table notes" (under table) for additional explainations.

Nucleo Board Name[94]	Nucleo Board Type[94]	Nucleo Host USB Conn	Nucleo Dev USB Conn	Nucleo Other Conn	Nucleo Debug Conn	MCU Part Number	MCU Clock (MHz)	MCU ARM Cortex	MCU Cache (KB)	MCU Flash (KB)	MCU EEPROM, OTP (KB)	MCU SRAM (KB)
Nucleo-F031K6	32	micro-AB FS				STM32F031K6T6	48	M0		32		4
Nucleo-F042K6	32	micro-AB FS				STM32F042K6T6	48	M0		32		6
Nucleo-F303K8	32	micro-AB FS				STM32F303K8T6	72	M4F		64		16
Nucleo-G031K8	32	micro-B FS				STM32G031K8T6	64	M0+		64(ECC)		8
Nucleo-G431KB	32	micro-B HS				STM32G431KBT6	170	M4F		128(ECC)		32
Nucleo-L011K4	32	micro-AB FS				STM32L011K4T6	32	M0+		16(ECC)	0.5(ECC) EEPROM	2
Nucleo-L031K6	32	micro-AB FS				STM32L031K6T6	32	M0+		32(ECC)	1(ECC) EEPROM	8
Nucleo-L412KB	32	micro-AB FS				STM32L412KBU6	80	M4F		128(ECC)		40
Nucleo-L432KC	32	micro-AB FS				STM32L432KCU6	80	M4F		256(ECC)		64
Nucleo-C031C6	64	micro-B FS			6x1 2.54mm	STM32C031C6T6	48	M0+		32		12
Nucleo-C051C8	64	micro-B FS			6x1 2.54mm	STM32C051C8T6	48	M0+		64		12
Nucleo-C071RB	64	USB-C FS	USB-C FS		5x2 1.27mm	STM32C071RBT6	48	M0+		128		24
Nucleo-C092RC	64	USB-C FS		CAN-FD	5x2 1.27mm	STM32C092RCT6	48	M0+		256		30
Nucleo-C542RC	64	USB-C HS	USB-C FS	CAN-FD	5x2 1.27mm	STM32C542RC	144	M33F	8I	256(ECC)	64(ECC) Data Flash, 4.5(ECC) OTP	64
Nucleo-C562RE	64	USB-C HS	USB-C FS	CAN-FD	5x2 1.27mm	STM32C562RE	144	M33F	8I	512(ECC)	64(ECC) Data Flash, 4.5(ECC) OTP	128
Nucleo-F030R8	64	mini-B FS			6x1 2.54mm	STM32F030R8T6	48	M0		64		8
Nucleo-F070RB	64	mini-B FS			6x1 2.54mm	STM32F070RBT6	48	M0		128		16
Nucleo-F072RB	64	mini-B FS			6x1 2.54mm	STM32F072RBT6	48	M0		128		16
Nucleo-F091RC	64	mini-B FS			6x1 2.54mm	STM32F091RCT6	48	M0		256		32
Nucleo-F103RB	64	mini-B FS			6x1 2.54mm	STM32F103RBT6	72	M3		128		20
Nucleo-F302R8	64	mini-B FS			6x1 2.54mm	STM32F302R8T6	72	M4F		64		16
Nucleo-F303RE	64	mini-B FS			6x1 2.54mm	STM32F303RET6	72	M4F		512		80
Nucleo-F334R8	64	mini-B FS			6x1 2.54mm	STM32F334R8T6	72	M4F		64		16
Nucleo-F401RE	64	mini-B FS			6x1 2.54mm	STM32F401RET6	84	M4F		512	0.5 OTP	96
Nucleo-F410RB	64	mini-B FS			6x1 2.54mm	STM32F410RBT6	100	M4F		128	0.5 OTP	32
Nucleo-F411RE	64	mini-B FS			6x1 2.54mm	STM32F411RET6	100	M4F		512	0.5 OTP	128
Nucleo-F446RE	64	mini-B FS			6x1 2.54mm	STM32F446RET6	180	M4F		512		132
Nucleo-G070RB	64	micro-B FS			6x1 2.54mm	STM32G070RBT6	64	M0+		128(ECC)		32
Nucleo-G071RB	64	micro-B FS			6x1 2.54mm	STM32G071RBT6	64	M0+		128(ECC)		32
Nucleo-G0B1RE	64	micro-B FS			6x1 2.54mm	STM32G0B1RET6	64	M0+		512(ECC)		128
Nucleo-G431RB	64	micro-B HS			5x2 1.27mm	STM32G431RBT6	170	M4F		128(ECC)		32
Nucleo-G474RE	64	micro-B HS			5x2 1.27mm	STM32G474RET6	170	M4F		512(ECC)		132
Nucleo-G491RE	64	micro-B HS			5x2 1.27mm	STM32G491RET6	170	M4F		512(ECC)		112
Nucleo-H503RB	64	USB-C HS	USB-C FS		5x2 1.27mm	STM32H503RBT6	250	M33F	8I	128(ECC)	2(ECC) OTP	34
Nucleo-H533RE	64	USB-C HS	USB-C FS		5x2 1.27mm	STM32H533RET6	250	M33F	8I, 4Dx	512(ECC)	2(ECC) OTP	274
Nucleo-L010RB	64	mini-B FS			6x1 2.54mm	STM32L010RBT6	32	M0+		128	0.5 EEPROM	20
Nucleo-L053R8	64	mini-B FS			6x1 2.54mm	STM32L053R8T6	32	M0+		64(ECC)	2(ECC) EEPROM	8
Nucleo-L073RZ	64	mini-B FS			6x1 2.54mm	STM32L073RZT6	32	M0+		192(ECC)	6(ECC) EEPROM	20
Nucleo-L152RE	64	mini-B FS			6x1 2.54mm	STM32L152RET6	32	M3		512(ECC)	16(ECC) EEPROM	80
Nucleo-L412RB-P	64	micro-B FS			6x1 2.54mm	STM32L412RBT6P	80	M4F		128(ECC)		40
Nucleo-L433RC-P	64	micro-B FS			6x1 2.54mm	STM32L433RCT6P	80	M4F		256(ECC)		64
Nucleo-L452RE	64	mini-B FS			6x1 2.54mm	STM32L452RET6	80	M4F		512(ECC)		160
Nucleo-L452RE-P	64	micro-B FS			6x1 2.54mm	STM32L452RET6P	80	M4F		512(ECC)		160
Nucleo-L476RG	64	mini-B FS			6x1 2.54mm	STM32L476RGT6	80	M4F		1024(ECC)		128
Nucleo-U031R8	64	micro-B FS			5x2 1.27mm	STM32U031R8T6	56	M0+		64		12
Nucleo-U083RC	64	micro-B FS			5x2 1.27mm	STM32U083RCT6	56	M0+		256		40
Nucleo-U385RG-Q	64	USB-C HS	USB-C FS		5x2 1.27mm	STM32U385RGT6Q	96	M33F	8I	1024(ECC)		256
Nucleo-U545RE-Q	64	USB-C HS	USB-C FS		5x2 1.27mm	STM32U545RET6Q	160	M33F	8I, 4Dx	512(ECC)		274
Nucleo-C5A3ZG	144	USB-C HS	USB-C FS	Ethernet RJ45 100M	10x2 1.27mm	STM32C5A3ZG	144	M33F	8I	1024(ECC)	64(ECC) Data Flash, 4.5(ECC) OTP	256
Nucleo-F207ZG	144	micro-B FS	micro-AB FS	Ethernet RJ45 100M	6x1 2.54mm	STM32F207ZGT6	120	M3		1024(ECC)		132
Nucleo-F303ZE	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32F303ZET6	72	M4F		512(ECC)		80
Nucleo-F412ZG	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32F412ZGT6	100	M4F		1024	0.5 OTP	256
Nucleo-F413ZH	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32F413ZHT6	100	M4F		1536	0.5 OTP	320
Nucleo-F439ZI	144	micro-B FS	micro-AB FS	Ethernet RJ45 100M	6x1 2.54mm	STM32F439ZIT6	180	M4F		2048		256
Nucleo-F446ZE	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32F446ZET6	180	M4F		512		132
Nucleo-F722ZE	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32F722ZET6	216	M7F	8I, 8D	512	0.5 OTP	276
Nucleo-F756ZG	144	micro-B FS	micro-AB FS	Ethernet RJ45 100M	6x1 2.54mm	STM32F756ZGT6	216	M7F	4I, 4D	1024	1 OTP	340
Nucleo-F767ZI	144	micro-B FS	micro-AB FS	Ethernet RJ45 100M	6x1 2.54mm	STM32F767ZIT6	216	M7FDP	16I, 16D	2048		532
Nucleo-H563ZI	144	USB-C HS	USB-C FS	Ethernet RJ45 100M	10x2 1.27mm	STM32H563ZIT6	250	M33F	8I, 4Dx	2048(ECC)	2(ECC) OTP	644
Nucleo-H5E5ZJ	144	USB-C HS	USB-C HS	Ethernet RJ45 100M	10x2 1.27mm	STM32H5E5ZJT6	250	M33F	16I, 8Dx	4096(ECC)	192(ECC) Data Flash, 2(ECC) OTP	1476
Nucleo-H723ZG	144	micro-B HS	micro-AB FS	Ethernet RJ45 100M	5x2 1.27mm	STM32H723ZGT6	550	M7FDP	32I, 32D	1024(ECC)		564
Nucleo-H753ZI	144	micro-B HS	micro-AB FS	Ethernet RJ45 100M	5x2 1.27mm	STM32H753ZIT6	480	M7FDP	16I, 16D	2048(ECC)		1060
Nucleo-H755ZI-Q	144	micro-B HS	micro-AB FS	Ethernet RJ45 100M	5x2 1.27mm	STM32H755ZIT6	480, 240	M7FDP & M4F	16I, 16D	2048(ECC)		1060
Nucleo-H7A3ZI-Q	144	micro-B HS	micro-AB FS		5x2 1.27mm	STM32H7A3ZIT6Q	280	M7FDP	16I, 16D	2048(ECC)	1(ECC) OTP	1480
Nucleo-H7S3L8	144	USB-C HS	USB-C HS	Ethernet RJ45 100M	10x2 1.27mm	STM32H7S3L8H6	600	M7FDP	32I, 32D	64(ECC)	1(ECC) OTP	548
Nucleo-L496ZG	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32L496ZGT6	80	M4F		1024(ECC)	1(ECC) OTP	320
Nucleo-L496ZG-P	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32L496ZGT6P	80	M4F		1024(ECC)	1(ECC) OTP	320
Nucleo-L4A6ZG	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32L4A6ZGT6	80	M4F		1024(ECC)	1(ECC) OTP	320
Nucleo-L4P5ZG	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32L4P5ZGT6	120	M4F		1024(ECC)	1(ECC) OTP	320
Nucleo-L4R5ZI	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32L4R5ZIT6	120	M4F		2048(ECC)	1(ECC) OTP	640
Nucleo-L4R5ZI-P	144	micro-B FS	micro-AB FS		6x1 2.54mm	STM32L4R5ZIT6P	120	M4F		2048(ECC)	1(ECC) OTP	640
Nucleo-L552ZE-Q	144	micro-B FS	USB-C FS		6x1 2.54mm	STM32L552ZET6Q	110	M33F	8I	512(ECC)	0.5(ECC) OTP	256
Nucleo-N657X0-Q	144	USB-C HS	USB-C HS	Ethernet RJ45 1G, Camera CSI 22-pin	10x2 1.27mm	STM32N657X0H3Q	800, 1000	M55FDP & NPU	32I, 32D	0	1.5 OTP	4424
Nucleo-U3C5ZI-Q	144	micro-B HS	USB-C FS	CAN-FD	10x2 1.27mm	STM32U3C5ZIT6Q	96	M33F	8I	2048(ECC)	0.5(ECC) OTP	640
Nucleo-U575ZI-Q	144	micro-B HS	USB-C FS		5x2 1.27mm	STM32U575ZIT6Q	160	M33F	8I, 4Dx	2048(ECC)	0.5(ECC) OTP	722
Nucleo-U5A5ZJ-Q	144	micro-B HS	USB-C HS		5x2 1.27mm	STM32U5A5ZJT6Q	160	M33F	32I, 16Dx	4096(ECC)	0.5(ECC) OTP	2450

Table notes

• Nucleo Board Name column - STMicroelectronics Nucleo board name and part number.^[94]
• Nucleo Board Type column - Nucleo board type. 32 means Nucleo-32, 64 means Nucleo-64, 144 means Nucleo-144.^[94]
• Nucleo Host USB Conn column - USB host connector type (and speed) on each Nucleo board. "FS" means Full Speed (12 Mbps max), "HS" means High Speed (480 Mbps max).
• Nucleo Dev USB Conn column - USB device connector type (and speed) on each Nucleo board. Mini means miniUSB, Micro means microUSB.
• Nucleo Other Conn column - Other connectors on each Nucleo board, such as CAN-FD, Ethernet, Camera. Ethernet includes its connector (RJ45) and maximum bit rate speed.
• Nucleo Debug Conn column - Debug connector (pin header) on each Nucleo board, including pin count and pitch (distance between center of pins in millimeters.
• MCU Part Number column - STMicroelectronics microcontroller part number of the IC on each Nucleo board. All MCU information in this table was sourced from official datasheets in this column.
• MCU Clock (MHz) column - Maximum clock rate (MHz) of the processor core inside the microcontroller. MHz means 10⁶ Hertz, also known as megahertz.
• MCU ARM Cortex column - ARM Cortex-M processor core family inside the microcontroller. The shortened "M0+" in the table means "ARM Cortex M0+". An appended "F" means the processor core contains a FPU (floating-point unit) with single-precision, appended "DP" means the FPU also supports double precision.
• MCU Cache (KB) column - Processor cache memory size (KB) and type inside the microcontroller. "I" means instruction cache, "D" means data cache, "Dx" means data cache for external memory.
• MCU Flash (KB) column - Total Flash memory size (KB) inside the microcontroller.
• MCU EEPROM, OTP (KB) column - Total EEPROM or One-Time Programmable (OTP) memory size (KB) inside the microcontroller.
• MCU SRAM (KB) column - Total Static RAM memory size (KB) inside the microcontroller. Total size assumes ECC and parity memory are enabled. Total size includes battery-backed SRAM. Total size doesn't include cache memory or peripheral buffer memory.
• For memories, ECC means memory has error correction code checking, Parity means memory has parity checking.

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The following Discovery evaluation boards are sold by STMicroelectronics to provide a quick and easy way for engineers to evaluate their microcontroller chips. These kits are available from various distributors for less than US$20. The STMicroelectronics evaluation product licence agreement forbids their use in any production system or any product that is offered for sale.^[101]

Each board includes an on-board ST-LINK for programming and debugging via a Mini-B USB connector. The power for each board is provided by a choice of the 5 V via the USB cable, or an external 5 V power supply. They can be used as output power supplies of 3 V or 5 V (current must be less than 100 mA). All Discovery boards also include a voltage regulator, reset button, user button, multiple LEDs, SWD header on top of each board, and rows of header pins on the bottom.^[102]

An open-source project was created to allow Linux to communicate with the ST-LINK debugger.^[103]

ChibiOS/RT, a free RTOS, has been ported to run on some of the Discovery boards.^{[104][105][106]}

STM32L476GDISCOVERY

• A discovery board for STM32L476VGT6 microcontroller with 80 MHz ARM Cortex-M4F core, 1024 KB flash, 128 KB RAM in LQFP100 package

STM32F429IDISCOVERY

• A discovery board for STM32F429ZIT6 microcontroller with 180 MHz ARM Cortex-M4F core, 2048 KB flash, 256 KB RAM, 4 KB battery-backed RAM in LQFP144 package.^[107]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, 8 MB SDRAM (IS42S16400J), 2.4-inch 320x200 TFT LCD color display (SF-TC240T), touchscreen controller (STMPE811), gyroscope (L3GD20), 2 user LEDs, user button, reset button, Full-Speed USB OTG to second Micro-AB USB connector, and two 32x2 male pin headers.

STM32F4DISCOVERY

• A discovery board for STM32F407VGT6 microcontroller with 168 MHz ARM Cortex-M4F core, 1024 KB flash, 192 KB RAM, 4 KB battery-backed RAM in LQFP100 package.^[60]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, accelerometer (LIS302DL), microphone (MP45DT02), audio codec (CS43L22), 3.5 mm audio jack, 4 user LEDs, user button, reset button, Full-Speed USB OTG to second Micro-AB USB connector, and two 25x2 male pin headers.
• A separate STM32F4DIS-BB baseboard is available.

STM32F401CDISCOVERY

• A discovery board for STM32F401VCT6 microcontroller with 84 MHz ARM Cortex-M4F core, 256 KB flash, 64 KB RAM in LQFP100 package.^[107]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, accelerometer/compass (LSM303DLHC), gyroscope (L3GD20), microphone (MP45DT02), audio codec (CS43L22), 3.5 mm audio jack, 4 user LEDs, user button, reset button, Full-Speed USB OTG to second Micro-AB USB connector, and two 25x2 male pin headers.

STM32F3DISCOVERY

• A discovery board for STM32F303VCT6 microcontroller with 72 MHz ARM Cortex-M4F core, 256 KB flash, 48 KB RAM (24K with parity) in LQFP100 package.^[57]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, accelerometer/compass (LSM303DLHC), gyroscope (L3GD20), 8 user LEDs, user button, reset button, Full-Speed USB to second Mini-B USB connector, and two 25x2 male pin headers.

STM32VLDISCOVERY

• A discovery board for STM32F100RBT6 microcontroller with 24 MHz ARM Cortex-M3 core, 128 KB flash, 8 KB RAM in LQFP64 package.^[108][109]
• This board includes an integrated ST-LINK debugger via Mini-B USB connector, 2 user LEDs, user button, reset button, and two 28x1 male pin headers.

STM32L-DISCOVERY

• A discovery board for STM32L152RBT6 microcontroller with 32 MHz ARM Cortex-M3 core, 128 KB flash (with ECC), 16 KB RAM, 4 KB EEPROM (with ECC) in LQFP64 package.^[109]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, 24-segment LCD, touch sensors, 2 user LEDs, user button, reset button, and two 28x1 male pin headers.
• This board is currently End-Of-Life and replaced by the 32L152CDISCOVERY board.

STM32L152CDISCOVERY

• A discovery board for STM32L152RCT6 microcontroller with 32 MHz ARM Cortex-M3 core, 256 KB flash (with ECC), 32 KB RAM, 8 KB EEPROM (with ECC) in LQFP64 package.
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, 24-segment LCD, touch sensors, 2 user LEDs, user button, reset button, and two 28x1 male pin headers.

STM32L100CDISCOVERY

• A discovery board for STM32L100RCT6 microcontroller with 32 MHz ARM Cortex-M3 core, 256 KB flash (with ECC), 16 KB RAM, 4 KB EEPROM (with ECC) in LQFP64 package.
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, 2 user LEDs, user button, reset button, and two 33x1 male pin headers.

STM32F072BDISCOVERY

• A discovery board for STM32F072RBT6 microcontroller with 48 MHz ARM Cortex-M0 core, 128 KB flash, 16 KB RAM (with parity) in LQFP64 package.^[47]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, gyroscope (L3GD20), 4 user LEDs, user button, reset button, linear touch keys, Full-Speed USB to second Mini-B USB connector, and two 33x1 male pin headers.

STM32F0DISCOVERY

• A discovery board for STM32F051R8T6 microcontroller with 48 MHz ARM Cortex-M0 core, 64 KB flash, 8 KB RAM (with parity) in LQFP64 package.^[110]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, 2 user LEDs, user button, reset button, and two 33x1 male pin headers.
• A prototyping perfboard with 0.1-inch (2.54 mm) grid of holes is included.

STM32F0308DISCOVERY

• A discovery board for STM32F030R8T6 microcontroller with 48 MHz ARM Cortex-M0 core, 64 KB flash, 8 KB RAM (with parity) in LQFP64 package.^[111]
• This board includes an integrated ST-LINK/V2 debugger via Mini-B USB connector, 2 user LEDs, user button, reset button, and two 33x1 male pin headers.
• A prototyping perfboard with 0.1-inch (2.54 mm) grid of holes is included.

The following evaluation kits are sold by STMicroelectronics.^[112]

STM32W-RFCKIT

• An RF evaluation board for STM32 W-series.
• It contains two boards, each with a STM32W108 SoC microcontroller in VFQFPN40 and VFQFPN48 packages.
• The evaluation board has a built-in 2.4 GHz IEEE 802.15.4 transceiver and Lower MAC (so supports 802.15.4, ZigBee RF4CE, ZigBee Pro, 6LoWPAN (Contiki) wireless protocols). The SoC contains 128-Kbyte flash and 8-Kbyte RAM memory. Flash memory is upgradable too via USB. It has an ARM Serial Wire Debug (SWD) interface (Remote board) and is designed to be powered by USB or with 2 AAA batteries (Remote board). There are two user-defined LEDs (green and yellow) and five push buttons to create easy-to-use remote functions (remote board).

STM3220G-JAVA

A ready-to-use Java development kits for its STM32 microcontrollers. The STM3220G-JAVA Starter Kit combines an evaluation version of IS2T's MicroEJ Software Development Kit (SDK) and the STM32F2 series microcontroller evaluation board providing everything engineers need to start their projects. MicroEJ provides extended features to create, simulate, test and deploy Java applications in embedded systems. Support for Graphical User Interface (GUI) development includes a widget library, design tools including storyboarding, and tools for customizing fonts.^[113] STM32 microcontrollers that embed Java have a Part Number that ends with J like STM32F205VGT6J.

Design utilities

• Simulink, by MathWorks provides model-based design solutions to design embedded systems. The Embedded Coder Support Package for STMicroelectronics Discovery Boards and the Simulink Coder Support Package for STMicroelectronics Nucleo Boards provide parameter tuning, signal monitoring and one-click deployment of Simulink algorithms to STM32 boards with access to peripherals like ADC, PWM, GPIOs, I²C, SPI, SCI, TCP/IP, UDP, etc.

Flash programming via USART

All STM32 microcontrollers have a ROM'ed bootloader that supports loading a binary image into its flash memory using one or more peripherals (varies by STM32 family). Since all STM32 bootloaders support loading from the USART peripheral and most boards connect the USART to RS-232 or a USB-to-UART adapter IC, thus it's a universal method to program the STM32 microcontroller. This method requires the target to have a way to enable/disable booting from the ROM'ed bootloader (i.e. jumper / switch / button).

STM32 C/C++ software libraries

• HAL (Hardware Abstraction Layer) Drivers
• LL (Low Layer) Drivers
• Human machine interface (HMI) Framework
• Standard peripheral library (deprecated)
• embOS, FreeRTOS, CMSIS-RTOS, ThreadX
• USB device library
• DSP library
• Encryption library
• Motor control library
• MP3 / WMA / Speex codecs and audio engine
• Self-test routines

The amount of documentation for all ARM chips can be daunting, especially for newcomers. As microprocessors have increased in capability and complexity, the documentation has grown. The total documentation for all ARM chips consists of documents from the IC manufacturer (STMicroelectronics) and documents from CPU core vendor (ARM Holdings).

A typical top-down documentation tree is: manufacturer website, manufacturer marketing slides, manufacturer datasheet for the exact physical chip, manufacturer detailed reference manual that describes common peripherals and aspects of a physical chip family, ARM core generic user guide, ARM core technical reference manual, ARM architecture reference manual that describes the instruction set(s).

STM32 documentation tree (top to bottom)

1. STM32 website.
2. STM32 marketing slides.
3. STM32 datasheet.
4. STM32 reference manual.
5. ARM core website.
6. ARM core generic user guide.
7. ARM core technical reference manual.
8. ARM architecture reference manual.

STMicroelectronics has additional documents, such as: evaluation board user manuals, application notes, getting started guides, software library documents, errata, and more. See External Links section for links to official STM32 and ARM documents.

Example:

STM32F407VG

• splits into STM32 F4 07 V G
• means: F4 series, 07 subtype, 100 pin, 1024 KB flash

Decoding:

STM32 xx ww y z

• xx – Series family
• ww – Subtype, differs by each series family
• y – Package pin count
• z – Flash memory size

• ARM architecture, List of ARM microprocessor cores, ARM Cortex-M
• Microcontroller, List of common microcontrollers
• Embedded system, Single-board microcontroller
• Interrupt, Interrupt handler, Comparison of real-time operating systems

• The Insider's Guide To The STM32 ARM Based Microcontroller; 2nd Edition (v1.8); Trevor Martin; Hitex; 96 pages; 2009; ISBN 0-9549988-8-X. (Download) (Other Guides)
• μC/OS-III: The Real-Time Kernel for the STMicroelecronics STM32F107; 1st Edition; Jean Labrosse; Micrium; 820 pages; 2009; ISBN 978-0-9823375-3-0.
• μC/TCP-IP: The Embedded Protocol Stack for the STMicroelectronics STM32F107; 1st Edition; Christian Légaré; Micrium; 824 pages; 2010; ISBN 978-0-9823375-0-9.

STM32 Official Documents

• STM32 official website

ARM Official Documents

Other

• STMicroelectronics GitHub: GitHub
• STM32 USART bus: Article 1, Article 2, Article 3
• STM32 SPI bus: Article 1
• STM32 ADC: Article 1
• STM32 Bit Band Memory: Article 1