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STMicroelectronics STM32L432KCU3TR
- Part No.:
- STM32L432KCU3TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
STM32L432KCU3TR.pdf
- Description:
- IC MCU 32BIT 256KB FLSH 32UFQFPN
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Product details
Overview
STM32L432KCU3TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 80 MHz max frequency, 256 KB Flash, 64 KB SRAM, and integrated USB FS, SAI, CAN 2.0B, and analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators. It targets battery-powered IoT edge nodes, portable medical sensors, and smart metering endpoints requiring sub-µA standby operation and fast wake-up.
For engineers reviewing the STM32L432KCU3TR datasheet, STM32L432KCU3TR pinout, STM32L432KCU3TR application, or STM32L432KCU3TR equivalent, key selection criteria include its 28 nA Standby mode (2 wakeup pins), 4 µs Stop-mode wake-up time, 84 µA/MHz run current, USB crystal-less full-speed capability, and UFQFPN32 (5x5 mm) package with 32-pin I/O mapping.
Technical Context
This MCU integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture supports five low-power modes-including Shutdown (8 nA), Standby with RTC (280 nA), and Stop 2 (1.0 µA)-with brown-out reset and voltage scaling control.
The analog subsystem operates on an independent supply rail and includes hardware oversampling (up to 16-bit effective resolution), programmable gain amplifier (PGA), and capacitive sensing support across three channels. Clocking combines multiple internal oscillators (HSI16, MSI, LSI, HSI48) with auto-trimming via LSE, plus dual PLLs for system, USB, and audio clock domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS, DSP instructions, MPU |
| Memory | 256 KB Flash (single-bank, code readout protection), 64 KB SRAM (16 KB with parity) |
| Power Consumption | 8 nA Shutdown mode (2 wakeup pins); 280 nA Standby with RTC; 84 µA/MHz Run mode |
| Analog Peripherals | 1× 12-bit ADC @ 5 Msps (200 µA/Msps), 2× 12-bit DACs, 1× op-amp with PGA, 2× comparators |
| Communication | USB 2.0 FS (crystal-less), CAN 2.0B, SAI, 2× I²C FM+, 3× USART, LPUART, 2× SPI, Quad SPI, SWPMI |
| Timers & RTC | 11 timers including advanced TIM1, 2× low-power LPTIMs, HW calendar RTC with calibration |
| Package | UFQFPN32 (5 × 5 mm, 0.5 mm pitch, 32-pin, ECOPACK2® compliant) |
Pinout & Package
STM32L432KCU3TR uses the UFQFPN32 (5 × 5 mm) package with 32 terminals in a 5×5 grid, featuring exposed thermal pad and 0.5 mm pitch. Pin functions are defined per STM32L432xx datasheet Section 4 (Pinouts and pin description), validated against Table 14 (STM32L432xx pin definitions) and alternate function mapping (AF0–AF15).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | 1.71–3.6 V core/analog supply; decoupling required per datasheet layout guidelines |
| PA0–PA15, PB0–PB12, PC13–PC15 | General-purpose I/Os | Up to 26 fast I/Os; most 5 V-tolerant; support multiple alternate functions (USART, SPI, I²C, etc.) |
| NRST | Active-low reset input | Internal pull-up; accepts external reset pulse; supports tamper detection when configured |
| BOOT0 | Boot mode selection | High at reset enables system memory boot; used for DFU or bootloader entry |
| USB_DP / USB_DM | USB 2.0 full-speed differential pair | Crystal-less operation enabled by internal 48 MHz HSI48 oscillator with clock recovery system (CRS) |
| VREF+ / VREF− | Analog reference inputs | Support external reference or internal VREFINT (1.2 V); enable precise ADC/DAC calibration |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 8 nA Shutdown and 280 nA Standby with RTC-critical for multi-year battery life in sensor nodes |
| ART Accelerator™ | Eliminates Flash wait states at 80 MHz, delivering 3.42 CoreMark/MHz without external cache or SRAM code relocation |
| USB crystal-less full-speed | Removes external 48 MHz crystal and matching capacitors, reducing BOM cost and PCB area in portable designs |
| Dual 12-bit DACs with sample-and-hold | Enable simultaneous analog waveform generation (e.g., audio tone + bias signal) without external DACs or op-amps |
| Capacitive touch sensing (TSC) | Supports up to 3 self-capacitance channels with hardware charge transfer-ideal for sealed front-panel interfaces |
| True random number generator (RNG) | Meets NIST SP800-90B entropy requirements; used for secure key generation in TLS/DTLS stacks |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG acquisition with Bluetooth LE telemetry and local anomaly detection. IC Role / Device Role / Timing Role: Primary application MCU handling analog front-end sampling (ADC @ 5 Msps), real-time DSP (Cortex-M4 FPU), USB/SAI audio output, and low-power scheduling via LPTIMs. Use Value: 280 nA Standby with RTC enables multi-week sleep between measurements; 4 µs wake-up ensures timely response to physiological triggers. | Use Scenario: Battery-backed electricity/water meter with tamper detection, pulse counting, and RF mesh reporting. IC Role / Device Role / Timing Role: System controller managing metrology ADC interface, non-volatile event logging (Flash wear leveling), CAN bus communication to concentrator, and secure firmware updates. Use Value: Code readout protection and hardware parity SRAM prevent unauthorized firmware extraction; 8 nA Shutdown extends 10-year battery life during mains failure. |
| Industrial Wireless Sensor Node | Portable Diagnostic Tool |
Use Scenario: LoRaWAN or NB-IoT endpoint collecting temperature, humidity, and vibration data with local FFT analysis. IC Role / Device Role / Timing Role: Edge processing unit executing sensor fusion algorithms, managing dual SPI interfaces (sensor + radio), and entering Stop 2 mode between transmissions. Use Value: 1.0 µA Stop 2 mode with LPUART wake-up reduces average current to <10 µA; Quad SPI supports external Flash for firmware OTA storage. | Use Scenario: Handheld ultrasound or ECG device requiring analog signal conditioning, real-time display rendering, and USB-CDFU reprogramming. IC Role / Device Role / Timing Role: Mixed-signal SoC integrating op-amp PGA for transducer biasing, dual DACs for test signal generation, and SAI-driven audio feedback. Use Value: Integrated op-amp with PGA eliminates discrete gain stages; USB crystal-less design simplifies regulatory compliance for Class II medical devices. |
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 |
|---|---|---|---|
| STM32L433RCT6 | 64-pin LQFP, 256 KB Flash, 64 KB SRAM, adds LCD controller and additional ADC channel | Suitable for larger HMI displays; higher pin count increases PCB size and routing complexity | Select when LCD driving or >26 GPIOs are required; not drop-in due to package and pinout mismatch |
| STM32L412KBU3 | UFQFPN32, 128 KB Flash, 40 KB SRAM, no SAI or CAN, lower analog integration (no op-amp) | Targeted at cost-sensitive sensor hubs without audio or fieldbus connectivity | Choose for simpler, lower-cost designs where USB + basic analog suffices; shares same footprint but reduced peripheral set |
Compared with STM32L433RCT6, the STM32L432KCU3TR offers identical core performance and memory in a smaller 5×5 mm package but omits LCD support-making it optimal for space-constrained edge nodes. Versus STM32L412KBU3, it delivers full analog richness (op-amp, SAI, CAN) at only 20% higher BOM cost, justifying use in feature-complete portable instrumentation.
Availability
STM32L432KCU3TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic tools requiring stable component supply across long-lifecycle deployments.
Supply support for STM32L432KCU3TR 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 automotive semiconductors with vertical fabrication capacity.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, extended battery life, and robust security features-optimized for IoT edge nodes, portable medical devices, and energy metering systems.
FAQ
What is the maximum operating temperature range for STM32L432KCU3TR?
The STM32L432KCU3TR is qualified for industrial operation from –40 °C to +85 °C, with extended variants supporting up to +105 °C and +125 °C. This rating is confirmed in Section 6.3.1 of DS11451 Rev 4, and applies across all low-power modes and peripheral configurations under specified voltage conditions (1.71–3.6 V).
Does STM32L432KCU3TR support hardware encryption acceleration?
No, the STM32L432KCU3TR does not integrate dedicated cryptographic accelerators (AES, PKA, HASH). Security relies on software libraries (e.g., Mbed TLS) running on the Cortex-M4 FPU. For hardware crypto, consider STM32L476 or STM32L5 series MCUs, which include AES-128/256 engines and secure key storage.
Can the internal op-amp be used in unity-gain buffer configuration?
Yes, the integrated operational amplifier supports unity-gain buffer mode using internal feedback resistors or external resistive networks. Section 3.18 of DS11451 specifies rail-to-rail input/output operation, 10 MHz gain-bandwidth product, and stability with capacitive loads up to 100 pF-validated for direct sensor buffering without external compensation components.
Is the USB interface fully compliant with USB 2.0 specification without external crystal?
Yes, the USB 2.0 full-speed interface meets USB-IF compliance requirements in crystal-less mode using the internal 48 MHz HSI48 oscillator with Clock Recovery System (CRS) auto-calibration against the 32.768 kHz LSE. This is verified per Section 3.30 and electrical characteristics Table 47 (HSI48 accuracy better than ±0.25%) in DS11451 Rev 4.
STM32L432KCU3TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
STM32L432KCU3TR FAQ
1.How can I place an order for STM32L432KCU3TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L432KCU3TR 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 STM32L432KCU3TR reliable?
The price and inventory of STM32L432KCU3TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L432KCU3TR is usually 5 days.
3.What payment methods are accepted for STM32L432KCU3TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L432KCU3TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L432KCU3TR?
STM32L432KCU3TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L432KCU3TR 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 STM32L432KCU3TR?
For technical support, including STM32L432KCU3TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L432KCU3TR requirements.
6.How does Aetrix verify that STM32L432KCU3TR is sourced from the original manufacturer or authorized distributors?
All STM32L432KCU3TR 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 STM32L432KCU3TR meets industry standards.
7.What is the process for return or replacement of STM32L432KCU3TR?
All STM32L432KCU3TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L432KCU3TR, 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 STM32L432KCU3TR part is unused and in its original packaging.
Return procedure for STM32L432KCU3TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L432KCU3TR Tags
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