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STM32L432KCU6

STM32L432KCU6

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Product Overview

The STM32L432KCU6 from STMicroelectronics is an ultra-low-power 32-bit microcontroller based on the Arm Cortex-M4 core with a single-precision floating-point unit (FPU), DSP instructions and Memory Protection Unit (MPU). It operates at up to 80MHz and integrates 256KB of Flash memory and 64KB of SRAM.

The device combines high processing performance with advanced low-power technologies and provides a rich set of analog and digital peripherals, including a 12-bit 5Msps ADC, two 12-bit DAC channels, operational amplifier, ultra-low-power comparators, USB 2.0 Full-Speed, CAN 2.0B, USART, I²C, SPI, SAI and Quad-SPI interfaces.

The STM32L432KCU6 is housed in a compact 32-pin UFQFPN package and is suitable for battery-powered equipment, industrial control, sensors, IoT devices, portable electronics and other energy-sensitive embedded applications.

Key Features

  • Arm 32-bit Cortex-M4 CPU with FPU

  • Up to 80MHz CPU frequency

  • DSP instructions

  • Memory Protection Unit

  • 256KB single-bank Flash memory

  • 64KB SRAM

  • 16KB SRAM with hardware parity checking

  • Quad-SPI Flash memory interface

  • 12-bit 5Msps ADC

  • Hardware ADC oversampling up to 16-bit resolution

  • Two 12-bit DAC channels

  • One operational amplifier with integrated PGA

  • Two ultra-low-power comparators

  • 14-channel DMA controller

  • Up to 26 fast I/Os

  • Most I/Os 5V tolerant

  • USB 2.0 Full-Speed interface

  • CAN 2.0B Active

  • Three USART interfaces

  • Two I²C interfaces

  • Two SPI interfaces plus Quad-SPI

  • SAI audio interface

  • LPUART

  • Advanced motor-control timer

  • Low-power timers

  • RTC with calendar, alarms and calibration

  • True random number generator

  • CRC calculation unit

  • 96-bit unique ID

  • SWD, JTAG and Embedded Trace Macrocell support

  • 1.71V to 3.6V supply

  • Ultra-low-power operating modes

  • ECOPACK2 compliant

Technical Specifications

Parameter Specification
Manufacturer STMicroelectronics
Part Number STM32L432KCU6
MCU Family STM32L432KC
Series STM32L4
Core Architecture 32-bit Arm Cortex-M4
FPU Single-precision FPU
Maximum Frequency 80MHz
Flash Memory 256KB
SRAM 64KB
ADC 12-bit SAR ADC
ADC Speed Up to 5Msps
ADC Resolution with Oversampling Up to 16-bit
DAC 2 × 12-bit
Operational Amplifier 1
Comparators 2
DMA 14 channels
GPIO Up to 26
USART 3
LPUART 1
I²C 2
SPI 2
Quad-SPI 1
SAI 1
USB USB 2.0 Full-Speed
CAN CAN 2.0B Active
Timers Up to 11
RTC Yes
TRNG Yes
Supply Voltage 1.71V to 3.6V
Operating Temperature -40°C to +85°C
Package 32-pin UFQFPN
Package Size 5mm × 5mm × 0.55mm
Package Code UFQFPN32
Product Status Active

ST lists STM32L432KCU6 as an Active product in volume production using the 32-pin UFQFPN 5 × 5 × 0.55mmpackage. The device is specified for the industrial -40°C to +85°C temperature range.

Processor & Architecture

The STM32L432KCU6 integrates a high-performance Arm Cortex-M4 32-bit RISC core operating at up to 80MHz.

The Cortex-M4 core provides:

  • Single-precision floating-point unit

  • DSP instruction set

  • Memory Protection Unit

  • Up to 100DMIPS performance

  • 1.25 DMIPS/MHz Dhrystone performance

  • ART Accelerator for Flash execution

ST specifies a CoreMark performance of approximately 273.55 CoreMark, or 3.42 CoreMark/MHz at 80MHz.

Memory & Storage

The STM32L432KCU6 provides:

  • 256KB single-bank embedded Flash

  • 64KB SRAM

  • 16KB SRAM with hardware parity checking

  • Quad-SPI memory interface

  • Flash readout protection

  • Proprietary code readout protection

  • 96-bit unique device identifier

The 256KB Flash capacity provides space for embedded firmware, communication stacks and application software, while 64KB SRAM supports runtime data processing and buffering.

Analog Peripherals

The STM32L432KCU6 provides a rich analog subsystem including:

12-bit ADC

  • 12-bit resolution

  • Up to 5Msps conversion rate

  • Up to 16-bit resolution with hardware oversampling

  • Up to 16 external channels depending on configuration

  • Independent analog supply

  • Approximately 200µA/Msps typical ADC consumption

DAC

  • Two 12-bit DAC output channels

  • Low-power sample-and-hold capability

Operational Amplifier

  • One integrated operational amplifier

  • Built-in programmable-gain functionality

Comparators

  • Two ultra-low-power comparators

  • Suitable for threshold detection and analog monitoring

These analog resources make the STM32L432KCU6 suitable for sensor acquisition, power monitoring, industrial measurement and mixed-signal control applications.

Timer & PWM Resources

The STM32L432KCU6 integrates up to 11 timer resources, including:

  • One 16-bit advanced motor-control timer

  • One 32-bit general-purpose timer

  • Two 16-bit general-purpose timers

  • Two 16-bit basic timers

  • Two low-power 16-bit timers

  • Two watchdog timers

  • SysTick timer

The advanced-control timer provides PWM functionality suitable for motor control, power conversion and embedded control applications. Low-power timers can continue operating in Stop modes for energy-efficient timing and wake-up functions.

Communication & Connectivity

The STM32L432KCU6 integrates a broad selection of communication interfaces.

USART

Three USART interfaces support functions including:

  • Asynchronous serial communication

  • Synchronous communication

  • LIN

  • IrDA

  • ISO 7816

  • Modem control

LPUART

The low-power UART supports wake-up from Stop 2 mode and is designed for low-energy serial communication.

I²C

Two I²C interfaces support:

  • Fast-mode Plus up to 1Mbit/s

  • SMBus

  • PMBus

  • Low-power communication

  • Wake-up functionality

SPI / Quad-SPI

Two SPI interfaces support high-speed serial communication, while the Quad-SPI interface provides connectivity to external Quad-SPI Flash memory.

USB

The integrated USB 2.0 Full-Speed interface provides:

  • Full-Speed USB communication

  • Crystal-less USB operation

  • Link Power Management

  • Battery Charging Detection

CAN

The STM32L432KCU6 supports CAN 2.0B Active, making it suitable for automotive-related and industrial networking applications.

SAI

The Serial Audio Interface supports digital audio connectivity for compatible audio applications.

Clock & Power Management

The STM32L432KCU6 includes a flexible clock system with:

  • 32kHz crystal oscillator for RTC

  • Internal 16MHz factory-trimmed RC oscillator

  • Internal low-power 32kHz RC oscillator

  • Internal multispeed oscillator from 100kHz to 48MHz

  • Internal 48MHz oscillator with clock recovery

  • Two PLLs for system clock, USB, audio and ADC applications

  • RTC clock support

The internal 16MHz oscillator is factory trimmed to approximately ±1%, while the multispeed oscillator can be automatically trimmed using the LSE reference.

Low-Power Operation

The STM32L432KCU6 is designed for ultra-low-power applications and supports several operating modes.

Typical ST specifications include:

  • Run mode: approximately 84µA/MHz

  • Stop 2 mode: approximately 1.0µA

  • Stop 2 with RTC: approximately 1.28µA

  • Standby mode: approximately 28nA

  • Standby with RTC: approximately 280nA

  • Shutdown mode: approximately 8nA

  • Wake-up from Stop mode: approximately 4µs

  • Batch Acquisition Mode for low-power data processing

These features make the STM32L432KCU6 particularly suitable for battery-powered and energy-harvesting applications.

Power Management

The STM32L432KCU6 supports:

  • 1.71V to 3.6V operating voltage

  • FlexPowerControl

  • Dynamic power management

  • Multiple low-power modes

  • Brownout reset

  • Power-on reset

  • Power-down reset

  • RTC backup supply

  • Independent analog supply

  • Low-power peripheral operation

The flexible power architecture enables designers to optimize energy consumption while maintaining the required processing and peripheral functionality.

Security & Data Integrity

The STM32L432KCU6 provides several hardware security and data-integrity mechanisms:

  • Memory Protection Unit

  • Proprietary code readout protection

  • Flash memory protection

  • Hardware SRAM parity checking

  • True random number generator

  • CRC calculation unit

  • 96-bit unique device identifier

  • Brownout and voltage monitoring

These functions help improve firmware protection, system reliability and data integrity in embedded applications.

Development & Debugging

The STM32L432KCU6 supports:

  • Serial Wire Debug (SWD)

  • JTAG

  • Embedded Trace Macrocell

  • STM32CubeMX

  • STM32CubeIDE

  • STM32CubeL4 software ecosystem

  • In-system Flash programming

  • ST-LINK development tools

  • STM32 Nucleo development platforms

The NUCLEO-L432KC development board is based on the STM32L432KC family and provides an ST-LINK debugger/programmer, USB connectivity and Arduino Nano V3-compatible expansion.

Applications

The STM32L432KCU6 is suitable for:

  • Battery-powered equipment

  • Industrial automation

  • Sensor systems

  • IoT devices

  • Smart home products

  • Portable measurement equipment

  • Data acquisition

  • Industrial instrumentation

  • Power management

  • Motor control

  • Consumer electronics

  • USB devices

  • Audio equipment

  • CAN-connected systems

  • Energy monitoring

  • Low-power embedded controllers

Its combination of Cortex-M4 processing performance, large memory capacity, advanced analog peripherals and ultra-low-power modes makes it suitable for sophisticated embedded designs where energy efficiency is important.

Benefits

  • 80MHz Arm Cortex-M4 performance

  • Integrated single-precision FPU

  • DSP instruction support

  • 256KB Flash memory

  • 64KB SRAM

  • 12-bit 5Msps ADC

  • Hardware ADC oversampling up to 16-bit

  • Two 12-bit DAC channels

  • Integrated operational amplifier

  • Two ultra-low-power comparators

  • USB 2.0 Full-Speed

  • CAN 2.0B Active

  • Multiple USART, I²C and SPI interfaces

  • Quad-SPI memory interface

  • 14-channel DMA

  • True random number generator

  • Extremely low shutdown and standby current

  • Compact 32-pin UFQFPN package

Packaging & Ordering Information

  • Part Number: STM32L432KCU6

  • Manufacturer: STMicroelectronics

  • Device Family: STM32L432KC

  • Series: STM32L4

  • Package: 32-pin UFQFPN

  • Package Size: 5mm × 5mm × 0.55mm

  • Package Code: UFQFPN32

  • Packing Type: Tray

  • Supply Voltage: 1.71V to 3.6V

  • Operating Temperature: -40°C to +85°C

  • Product Status: Active

  • RoHS Compliance: ECOPACK2

ST's official product page lists STM32L432KCU6 as an Active product in volume production and specifies the UFQFPN 32, 5 × 5 × 0.55mm package. The exact KCU6 variant is the industrial -40°C to +85°C version; KCU6TR is the tape-and-reel ordering variant.

Datasheet

For complete electrical characteristics, pin configuration, memory architecture, ADC and DAC specifications, timer configuration, communication interfaces, USB/CAN specifications, absolute maximum ratings, and application information, please refer to the official STMicroelectronics documentation.

Datasheet: Official STM32L432KCU6 Datasheet

Frequently Asked Questions

Q: What is the STM32L432KCU6?
A: The STM32L432KCU6 is an STMicroelectronics ultra-low-power 32-bit Arm Cortex-M4 microcontroller operating at up to 80MHz with FPU and DSP capabilities.

Q: How much Flash memory does the STM32L432KCU6 have?
A: It provides 256KB of embedded Flash memory.

Q: How much RAM does the STM32L432KCU6 have?
A: The device integrates 64KB of SRAM, including 16KB with hardware parity checking.

Q: What package does the STM32L432KCU6 use?
A: It uses a 32-pin UFQFPN package measuring 5mm × 5mm × 0.55mm.

Q: What is the operating voltage?
A: The operating supply voltage is 1.71V to 3.6V.

Q: What is the maximum CPU frequency?
A: The Arm Cortex-M4 CPU operates at up to 80MHz.

Q: Does the STM32L432KCU6 have an ADC?
A: Yes. It integrates a 12-bit ADC with up to 5Msps performance and hardware oversampling that can provide up to 16-bit resolution.

Q: Does the STM32L432KCU6 have DAC outputs?
A: Yes. It provides two 12-bit DAC output channels.

Q: Does the STM32L432KCU6 support USB?
A: Yes. It includes a USB 2.0 Full-Speed interface with crystal-less operation, Link Power Management and Battery Charging Detection.

Q: Does the STM32L432KCU6 support CAN?
A: Yes. The device supports CAN 2.0B Active.

Q: Is the STM32L432KCU6 an active product?
A: Yes. STMicroelectronics currently lists STM32L432KCU6 as an Active product in volume production.

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