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STMicroelectronics STM32L432KCU6
- Part No.:
- STM32L432KCU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L432KCU6.pdf
- Description:
- IC MCU 32BIT 256KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:11,882
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Product details
Overview
STM32L432KCU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 256 KB Flash, 64 KB SRAM, USB FS, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators - deployed in battery-powered IoT sensor nodes requiring sub-µA standby operation and fast wake-up.
For engineers reviewing the STM32L432KCU6 datasheet, STM32L432KCU6 pinout, STM32L432KCU6 application, or STM32L432KCU6 equivalent, key selection considerations include its 8 nA shutdown current, 4 µs wake-up from Stop mode, USB crystal-less full-speed capability, LPUART wake-up support, and UFQFPN32 (5×5 mm) package for space-constrained portable designs.
Technical Context
The STM32L432KCU6 integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from Flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral access. Its FlexPowerControl architecture supports seven low-power modes, including Shutdown (8 nA), Standby with RTC (280 nA), and Stop 2 (1.0 µA), all with configurable wakeup sources.
Clock management includes dual PLLs (system/USB/audio), four internal oscillators (HSI16, MSI, LSI, HSI48), and LSE-based auto-trimming - delivering ±0.25% accuracy for USB clock recovery without external crystal. Analog subsystem operates on independent supply rails, supporting simultaneous high-precision sensing and low-noise signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP and control algorithms in resource-constrained edge devices. |
| Memory | 256 KB Flash (single-bank, code readout protection), 64 KB SRAM (16 KB with hardware parity) - supports secure firmware storage and robust data handling. |
| Low-Power Performance | 8 nA Shutdown, 280 nA Standby with RTC, 1.0 µA Stop 2 mode - extends battery life to years in intermittent-sensing applications. |
| Analog Peripherals | 1× 12-bit ADC (5 Msps, 16-bit oversampling), 2× 12-bit DACs, 1× op-amp with PGA, 2× comparators - enables closed-loop analog signal chain without external components. |
| Connectivity | USB 2.0 FS crystal-less, CAN 2.0B, SAI, 3× USART, LPUART, 2× I²C, 2× SPI, QuadSPI - supports mixed wired/wireless edge node communication and audio streaming. |
| Package | UFQFPN32 (5 × 5 mm, 0.5 mm pitch) - surface-mount footprint optimized for compact PCB layouts in wearables and smart sensors. |
| Operating Range | 1.71–3.6 V supply, –40 °C to +105 °C ambient - suitable for industrial and automotive-adjacent environments without external voltage regulation. |
Pinout & Package
UFQFPN32 (5 × 5 mm, 32-pin, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant and ECOPACK2® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers digital core and I/Os; separate VDDA/VSSA required for analog peripherals to ensure noise isolation. |
| PA0–PA15, PB0–PB11 | General-purpose I/O | 26 total fast I/Os; most 5 V-tolerant - simplifies level-shifting in mixed-voltage systems and supports direct connection to legacy peripherals. |
| PA2/PA3 | USART2_TX/USART2_RX | Dedicated UART interface with LIN/IRDA/ISO7816 support - enables firmware updates and sensor telemetry over single-wire bus. |
| PA11/PA12 | USB_DM/USB_DP | Crysal-less USB Full-Speed interface - eliminates external 48 MHz crystal, reducing BOM cost and board area. |
| PA4–PA7 | ADC1_IN1–ADC1_IN4 | Analog input channels with hardware oversampling - achieves effective 16-bit resolution at reduced sampling rates for precision sensor interfacing. |
| PA4/PB0 | DAC1_OUT1/DAC2_OUT1 | Independent 12-bit voltage outputs with sample-and-hold - drives analog actuators or reference voltages without external buffering. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl low-power modes | 8 nA Shutdown and 4 µs wake-up from Stop enable rapid duty-cycled operation in energy-harvesting systems. |
| ART Accelerator™ | Zero-wait-state Flash execution at 80 MHz - eliminates performance penalty of embedded Flash, matching SRAM-like throughput. |
| USB crystal-less full-speed | Integrated 48 MHz HSI48 oscillator with LSE-trimmed clock recovery - removes external crystal and associated capacitors, lowering system cost. |
| Integrated analog front-end | Single-chip solution with ADC, dual DACs, op-amp+PGA, and comparators - replaces discrete signal-chain components in sensor nodes and portable medical devices. |
| LPUART wake-up | Asynchronous serial interface active in Stop 2 mode - allows remote command-triggered wake-up without continuous power draw. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity node transmitting data via BLE gateway every 5 minutes. IC Role / Device Role / Timing Role: Main controller executing sensor acquisition, data preprocessing, USB/LPUART communication, and ultra-low-power state management. Use Value: 8 nA Shutdown and 4 µs wake-up minimize idle current, extending CR2032 battery life beyond 5 years while maintaining responsive command handling. |
Use Scenario: Handheld ECG patch recording analog biopotentials and streaming processed waveforms via USB. IC Role / Device Role / Timing Role: Analog signal conditioner (ADC + op-amp + DAC), real-time DSP engine, and USB FS endpoint controller. Use Value: Integrated 12-bit ADC (5 Msps) and op-amp with PGA enable direct electrode interfacing; crystal-less USB reduces size and EMI risk near sensitive analog paths. |
| Smart Building Controller | Industrial Predictive Maintenance Edge Node |
Use Scenario: Wall-mounted HVAC controller monitoring CO₂, occupancy, and ambient light while coordinating fan speed and valve position. IC Role / Device Role / Timing Role: Multi-peripheral hub managing I²C gas sensors, PWM fan drivers, capacitive touch inputs, and CAN bus diagnostics. Use Value: 26 5 V-tolerant I/Os and CAN 2.0B interface allow direct integration with legacy building automation infrastructure without level shifters or transceivers. |
Use Scenario: Vibration sensor node attached to motor housing, performing FFT analysis and triggering alerts via CAN when bearing faults exceed thresholds. IC Role / Device Role / Timing Role: Real-time vibration data acquisition (ADC), DSP acceleration (Cortex-M4+FPU), and CAN 2.0B alarm reporting. Use Value: 100 DMIPS + hardware-accelerated math instructions enable on-device FFT and envelope detection - eliminating cloud dependency for latency-critical fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L433RCT6 | 64 KB RAM (vs. 64 KB), 256 KB Flash, adds LCD controller and additional ADC channel - larger LQFP64 package (10×10 mm). | Required for segment LCD display integration or higher-channel analog acquisition; not drop-in due to pin count and package mismatch. | Select when display interface or extra analog inputs are mandatory; avoid if space or pin count constraints apply. |
| STM32L072KBU6 | Cortex-M0+, 32 KB Flash, 20 KB RAM, lower performance (37 DMIPS), no USB FS or SAI - same UFQFPN32 package. | Suitable for simpler sensor polling or basic control where USB/audio are unnecessary and cost is critical. | Choose for cost-sensitive, non-USB applications needing identical footprint and lowest active current (190 nA Standby). |
Compared with STM32L432KCU6, STM32L433RCT6 offers expanded peripherals at the cost of size and complexity, while STM32L072KBU6 trades performance and connectivity for minimal BOM cost and ultra-low static current - making the KCU6 optimal for balanced USB-enabled, analog-rich edge nodes in tight form factors.
Availability
STM32L432KCU6 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart building controllers, and industrial predictive maintenance edge nodes requiring stable component supply across multi-year production cycles.
Supply support for STM32L432KCU6 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, sensors, and analog products for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance per µA, combining Cortex-M4 efficiency with advanced power gating and integrated analog - specifically engineered for battery-operated IoT endpoints and portable medical devices.
FAQ
What is the minimum supply voltage for STM32L432KCU6 operation?
The STM32L432KCU6 operates down to 1.71 V across its full temperature range (–40 °C to +105 °C). Below this threshold, brown-out reset (BOR) activates to prevent unreliable behavior. The device supports dynamic voltage scaling (VOS) to optimize power vs. performance, with VOS 1 enabling full 80 MHz operation at ≥2.2 V and VOS 3 permitting 26 MHz operation at 1.71 V.
Does STM32L432KCU6 support USB without an external crystal?
Yes - it integrates a 48 MHz HSI48 oscillator with automatic trimming using the 32.768 kHz LSE crystal, achieving better than ±0.25% accuracy for USB Full-Speed compliance. This eliminates the need for an external 48 MHz crystal and associated load capacitors, reducing bill-of-materials cost and PCB area.
How many analog-to-digital converter channels does STM32L432KCU6 provide?
The device features one 12-bit ADC with up to 16 external input channels (e.g., PA0–PA7, PB0–PB1, etc.), supporting hardware oversampling to achieve up to 16-bit effective resolution. It also includes a built-in temperature sensor and VREFINT reference, both accessible via dedicated ADC channels for system calibration and monitoring.
Is STM32L432KCU6 pin-compatible with other STM32L4 variants?
No - the STM32L432KCU6 in UFQFPN32 has a unique 32-pin pinout optimized for its peripheral set. While other L4-series MCUs like STM32L433 or STM32L476 use different packages (e.g., LQFP64, UFBGA100), no 32-pin L4 variant shares identical pin mapping. Migration requires PCB redesign and firmware adaptation due to differing peripheral assignments and power domain routing.
STM32L432KCU6 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:
STM32L432KCU6 FAQ
1.How can I place an order for STM32L432KCU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L432KCU6 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 STM32L432KCU6 reliable?
The price and inventory of STM32L432KCU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L432KCU6 is usually 5 days.
3.What payment methods are accepted for STM32L432KCU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L432KCU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L432KCU6?
STM32L432KCU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L432KCU6 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 STM32L432KCU6?
For technical support, including STM32L432KCU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L432KCU6 requirements.
6.How does Aetrix verify that STM32L432KCU6 is sourced from the original manufacturer or authorized distributors?
All STM32L432KCU6 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 STM32L432KCU6 meets industry standards.
7.What is the process for return or replacement of STM32L432KCU6?
All STM32L432KCU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L432KCU6, 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 STM32L432KCU6 part is unused and in its original packaging.
Return procedure for STM32L432KCU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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