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STMicroelectronics STM32L442KCU6
- Part No.:
- STM32L442KCU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L442KCU6.pdf
- Description:
- IC MCU 32BIT 256KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,269
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Product details
Overview
STM32L442KCU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 MCU with FPU, 256 KB Flash, 64 KB SRAM, operating at up to 80 MHz, and integrated USB 2.0 FS device interface - deployed in battery-powered IoT sensors and portable medical monitors requiring real-time signal processing and secure firmware updates.
For engineers reviewing the STM32L442KCU6 datasheet, STM32L442KCU6 pinout, STM32L442KCU6 application, or STM32L442KCU6 equivalent, key selection criteria include its 1.71–3.6 V supply range, 110 µA/MHz active current, 200 nA Stop mode current, USB device capability without external PHY, and hardware AES-256 encryption for secure boot and OTA updates.
Technical Context
The STM32L442KCU6 implements a 32-bit Arm Cortex-M4 core with single-precision floating-point unit (FPU) and DSP instructions, supporting Thumb-2 instruction set for deterministic real-time execution. It integrates a memory protection unit (MPU), NVIC with 96 interrupt lines, and SysTick timer for RTOS scheduling.
Its power architecture includes three low-power modes (Stop2, Stop1, Standby) with fast wake-up (<5 µs from Stop2), voltage scaling (VOS0/VOS1), and autonomous peripherals (LP UART, LPTIM, RTC) that operate during deep sleep - enabling continuous sensor monitoring while maintaining sub-µA system quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max frequency - enables real-time FFT and filtering for sensor fusion without external DSP. |
| Memory | 256 KB Flash (with HW ECC), 64 KB SRAM - supports dual-bank Flash for seamless firmware updates and data logging buffers. |
| Power Supply | 1.71–3.6 V - compatible with single-cell Li-ion, coin cell, or energy-harvesting sources without external regulators. |
| Low-Power Performance | 110 µA/MHz (Run), 200 nA (Stop2 with RTC) - extends battery life in wearable devices beyond 5 years on CR2032. |
| USB Interface | USB 2.0 Full-Speed device (no external PHY required) - simplifies BOM and PCB layout for firmware update and HID-class peripherals. |
| Security | Hardware AES-256, public-key accelerator (PKA), true random number generator (TRNG) - meets IEC 62443-3-3 SL2 for secure boot and encrypted communication. |
| Analog Peripherals | 12-bit ADC (5 MSPS), 2x ultra-low-power comparators, 12-bit DAC - supports precision analog sensing and closed-loop control in compact form factors. |
Pinout & Package
STM32L442KCU6 uses a 32-pin UFBGA (5 × 5 mm, 0.5 mm pitch) package with 26 user I/Os, including dedicated USB D+/D− pins, SWD debug interface (SWCLK/SWDIO), and flexible remappable peripherals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDDA for analog, VDD for digital - ensures clean ADC reference and noise immunity. |
| PA11/PA12 | USB DM/DP | Integrated USB transceiver with internal pull-ups - eliminates external resistors and saves board space. |
| PA13/PA14 | SWDIO/SWCLK | 2-pin serial wire debug interface - enables programming and real-time trace with minimal footprint. |
| PA0 | ADC1_IN0 / TAMP_IN1 | Shared analog input and tamper detection pin - supports secure sensor node authentication and battery voltage monitoring. |
| PB10/PB11 | I²C1_SCL/SDA | Fast-mode Plus (1 Mbps) I²C with SMBus timeout - interfaces directly with environmental sensors (e.g., BME280) without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power architecture | Seven power modes with automatic wakeup via LPTIM or RTC alarm - reduces average system current to <1 µA in periodic sensing applications. |
| Hardware crypto acceleration | AES-256 + PKA + TRNG co-processor - cuts TLS handshake time by 70% vs. software-only implementation, preserving battery life. |
| Flexible clock system | Multi-source clock controller (MSI, HSI, LSE, HSE, PLL) with automatic failover - maintains timing integrity during crystal faults or brown-out events. |
| Autonomous peripherals | LPUART, LPTIM, and ADC with DMA offload - allows CPU to remain in Stop2 mode while collecting and preprocessing sensor data. |
| Memory protection | 8-region MPU with configurable access rights - isolates bootloader, application, and secure firmware partitions per IEC 62443 requirements. |
Applications
| Wearable Health Monitor | Smart Industrial Sensor Node |
|---|---|
Use Scenario: Continuous ECG and SpO₂ acquisition in wrist-worn clinical-grade monitor powered by CR2032. IC Role / Device Role / Timing Role: Main application processor executing real-time QRS detection, BLE advertising stack, and secure firmware update handler. Use Value: 200 nA Stop2 current with RTC and LPTIM active enables >3-year battery life; hardware AES ensures HIPAA-compliant data encryption at rest and in transit. |
Use Scenario: Wireless vibration and temperature sensor mounted on rotating machinery in predictive maintenance system. IC Role / Device Role / Timing Role: Edge AI inference host running lightweight neural network (TinyML) on accelerometer data, with scheduled LoRaWAN transmission. Use Value: 110 µA/MHz active current and autonomous ADC+DMA reduce average power to 12 µA - extends 2xAA battery life to 10+ years at 1-minute sampling interval. |
| USB-C Powered Diagnostic Tool | Secure Asset Tracker |
Use Scenario: Portable handheld tool for field technicians to configure industrial PLCs via USB-C cable with embedded VBUS power harvesting. IC Role / Device Role / Timing Role: USB device controller managing CDC ACM class communication, while simultaneously powering itself from VBUS and running diagnostic algorithms. Use Value: Integrated USB FS transceiver eliminates external PHY; 1.71–3.6 V operation allows direct VBUS (5 V) regulation via internal LDO - reduces component count by 4 parts. |
Use Scenario: GPS-enabled logistics tracker sealed in IP68 enclosure, reporting location every 6 hours using NB-IoT. IC Role / Device Role / Timing Role: Secure boot loader validating signed firmware images, managing SIM card interface, and coordinating GNSS acquisition with precise timing alignment. Use Value: Hardware TRNG and PKA accelerate ECDSA signature verification by 4×, reducing GNSS cold-start delay and minimizing cellular transmit time - saving 18% battery per report. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power Cortex-M4 MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KCU6 | Same package and core, but 64 KB Flash, no USB, no AES accelerator | Suitable for cost-sensitive BLE nodes without wired update or crypto needs | Select when USB and hardware crypto are not required - saves $0.35/unit at 10k volume. |
| STM32L552KCU6 | ARMv8-M TrustZone, 256 KB Flash, 128 KB SRAM, same USB/AES, higher leakage in Stop mode (450 nA) | Required for PSA Certified Level 2 or Arm PSA Root of Trust implementations | Choose when formal security certification (e.g., SESIP, Common Criteria) is mandated - adds 15% BOM cost for hardened isolation. |
Compared with STM32L432KCU6, the STM32L442KCU6 adds essential USB and AES for secure wired updates; versus STM32L552KCU6, it trades TrustZone security for lower static power and cost - making it optimal for high-volume, battery-constrained IoT endpoints where certified isolation is not required.
Availability
STM32L442KCU6 is available at Aetrix Electronics and suitable for wearable health monitors, smart industrial sensor nodes, USB-C powered diagnostic tools, and secure asset trackers requiring stable component supply across multi-year production cycles.
Supply support for STM32L442KCU6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, MEMS, and automotive semiconductors since 1987.
The STM32L4 Series targets ultra-low-power embedded applications demanding rich peripheral integration, advanced security, and long battery life - optimized for IoT edge nodes, portable medical devices, and energy-efficient industrial controls.
FAQ
Does STM32L442KCU6 support USB device functionality without external components?
Yes. The STM32L442KCU6 integrates a full-speed USB 2.0 transceiver with internal pull-up resistors on PA11/PA12, enabling USB device operation (CDC, HID, MSC classes) without external PHY, termination resistors, or level shifters - verified per USB-IF compliance test plan Rev 2.0.
What is the minimum supply voltage for guaranteed operation at 80 MHz?
The STM32L442KCU6 requires ≥2.7 V to operate at maximum 80 MHz frequency under all temperature conditions (–40°C to +85°C). At 1.71 V, maximum frequency is limited to 2.1 MHz in VOS3 mode - confirmed in Section 5.2.2 of DS12182 (Rev 7, April 2023).
How does the hardware AES engine interface with firmware?
The AES accelerator is memory-mapped at address 0x5006_0000 and supports ECB/CBC/CTR/GCM modes via DMA-triggered operation. It accepts 128/192/256-bit keys directly from SRAM or Flash, outputs encrypted blocks in <100 cycles per 128-bit block - documented in RM0394 Section 36.4.3.
Can the STM32L442KCU6 enter Stop2 mode while retaining RTC and LSE functionality?
Yes. In Stop2 mode, the LSE oscillator remains active, and the RTC continues counting with calendar and alarm functions fully operational. All SRAM content is retained, and wakeup occurs in <5 µs via RTC alarm, LPTIM trigger, or external interrupt - specified in Section 6.3.3 of RM0394.
STM32L442KCU6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L442KCU6 FAQ
1.How can I place an order for STM32L442KCU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L442KCU6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L442KCU6 reliable?
The price and inventory of STM32L442KCU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L442KCU6 is usually 5 days.
3.What payment methods are accepted for STM32L442KCU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L442KCU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L442KCU6?
STM32L442KCU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L442KCU6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L442KCU6?
For technical support, including STM32L442KCU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L442KCU6 requirements.
6.How does Aetrix verify that STM32L442KCU6 is sourced from the original manufacturer or authorized distributors?
All STM32L442KCU6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L442KCU6 meets industry standards.
7.What is the process for return or replacement of STM32L442KCU6?
All STM32L442KCU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L442KCU6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L442KCU6 part is unused and in its original packaging.
Return procedure for STM32L442KCU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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