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STMicroelectronics STM32L422KBU6
- Part No.:
- STM32L422KBU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L422KBU6.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,932
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Product details
Overview
STM32L422KBU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 128 KB flash, 40 KB SRAM, hardware AES encryption, and integrated analog peripherals including dual 12-bit ADCs (5 Msps) and one operational amplifier. It targets battery-powered IoT sensors and portable medical devices requiring sub-µA standby operation and secure firmware execution.
For engineers reviewing the STM32L422KBU6 datasheet, STM32L422KBU6 pinout, STM32L422KBU6 application, or STM32L422KBU6 equivalent, key selection criteria include its 245 nA Standby+RTC current, LPUART wake-up capability in Stop 2 mode, 32-pin UFQFPN package with 5 V-tolerant I/Os, and support for batch acquisition mode (BAM) in low-power sensing systems.
Technical Context
The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, coupled with a memory protection unit (MPU) and proprietary code readout protection. Its FlexPowerControl architecture supports seven low-power modes-including Shutdown (16 nA), Standby with RTC (245 nA), and Stop 2 (0.7 µA)-with 4 µs wakeup latency.
On-chip analog resources include two independent 12-bit ADCs (5 Msps, hardware oversampling up to 16-bit), one ultra-low-power comparator, and one op-amp with programmable gain amplifier (PGA), all supplied from a dedicated analog rail. The USB 2.0 full-speed interface operates without external crystal via internal 48 MHz HSI48 oscillator with clock recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and DSP instructions; enables real-time signal processing in sensor fusion and motor control. |
| Max Clock Frequency | 80 MHz; delivers 100 DMIPS performance with ART Accelerator enabling zero-wait-state flash execution. |
| Flash / SRAM | 128 KB single-bank flash with readout protection; 40 KB SRAM (8 KB with hardware parity) for robust data integrity. |
| Low-Power Modes | Shutdown: 16 nA; Standby+RTC: 245 nA; Stop 2: 0.7 µA; enables multi-year battery life in intermittent-sensing applications. |
| Analog Peripherals | Dual 12-bit ADCs (5 Msps, 200 µA/Msps); 1 op-amp with PGA; 1 ultra-low-power comparator - supports precision analog front-end design. |
| Security & Crypto | Hardware AES-128/256 accelerator + TRNG + 96-bit unique ID; enables secure boot, firmware encryption, and device authentication. |
| Communication | USB 2.0 FS (crystal-less), 3× I²C FM+, 3× USART, 1× LPUART, 2× SPI, Quad-SPI, IRTIM - supports mixed wired/wireless edge node connectivity. |
Pinout & Package
STM32L422KBU6 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5 mm × 5 mm with 0.5 mm pitch, suitable for space-constrained portable designs. The package is ECOPACK2-compliant and features 26 general-purpose I/Os, most 5 V-tolerant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Core power supply and ground | 1.71–3.6 V main supply; decoupling required per datasheet layout guidelines for stable low-noise operation. |
| VDDA, VSSA | Analog power and ground | Dedicated 1.71–3.6 V analog rail; isolation from digital noise critical for ADC/OPAMP accuracy. |
| PA0–PA15, PB0–PB12 | General-purpose I/Os | Up to 26 GPIOs; majority 5 V-tolerant - simplifies level-shifting in mixed-voltage systems. |
| PA2/PA3 | USART2 TX/RX | Support LIN, IrDA, modem protocols; usable in automotive body electronics and industrial diagnostics. |
| PA4–PA7 | ADC1_IN1–ADC1_IN4 | Four dedicated analog inputs for first ADC; enable simultaneous sampling of multiple sensor signals. |
| PA13/PA14 | SWDIO/SWCLK | Serial Wire Debug interface - minimal 2-pin debug access for field firmware updates and validation. |
| PC13 | RTC_OUT/LSE | 32.768 kHz low-speed external oscillator output or RTC alarm pulse - enables precise timekeeping and periodic wake-up. |
| PD0/PD1 | OSC_IN/OSC_OUT | 4–48 MHz high-speed crystal oscillator connection - used for system clock accuracy or USB timing reference. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Seven configurable low-power modes with sub-µA currents and <4 µs wakeup - extends battery life while maintaining responsiveness. |
| ART Accelerator™ | Zero-wait-state execution from flash at 80 MHz - eliminates external RAM dependency for deterministic real-time code execution. |
| Dual 12-bit ADCs with oversampling | 5 Msps sampling rate, hardware 16-bit oversampling, 200 µA/Msps efficiency - enables high-resolution sensor data capture with low power overhead. |
| Crystal-less USB 2.0 FS | Internal 48 MHz HSI48 oscillator with clock recovery - removes external crystal, reducing BOM cost and PCB area in portable endpoints. |
| Capacitive touch sensing (TSC) | 12-channel controller supporting touchkey, linear, and rotary sensors - enables intuitive HMI in wearables and medical handhelds without external ICs. |
| Batch Acquisition Mode (BAM) | Automated ADC/DMA sequence triggered by timer or event - reduces CPU load and power during periodic sensor polling cycles. |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition with motion artifact compensation and local anomaly detection. IC Role / Device Role / Timing Role: Main controller executing sensor fusion algorithms, managing BLE radio sleep/wake cycles, and securing biometric data with AES. Use Value: 245 nA Standby+RTC enables multi-week operation on coin-cell; dual ADCs sample analog front-end at 5 Msps with hardware oversampling for noise reduction. | Use Scenario: Battery-powered gas/water meter with hourly pressure/flow readings, tamper detection, and RF transmission. IC Role / Device Role / Timing Role: System-on-chip handling metrology ADC, LPUART wake-up for burst telemetry, and secure firmware updates over LPWAN. Use Value: 0.7 µA Stop 2 mode with LPUART wake-up ensures >10-year battery life; AES engine encrypts usage logs before transmission. |
| Portable Diagnostic Tool | Industrial Wireless Sensor Node |
Use Scenario: Handheld ultrasound probe with analog beamforming, real-time image buffering, and USB-C host interface. IC Role / Device Role / Timing Role: Real-time signal processor running FIR filters and envelope detection; USB 2.0 FS transfers compressed frames to tablet. Use Value: ART Accelerator enables 80 MHz deterministic execution from flash; op-amp + comparator support analog front-end conditioning without external components. | Use Scenario: Vibration monitoring node on rotating machinery, sampling accelerometer data every 5 seconds and transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Low-power data logger using BAM to trigger ADC/DMA bursts, then entering Stop 2 until next interval. Use Value: 4 µs wakeup from Stop 2 minimizes latency in event-driven sampling; Quad-SPI interface supports external FRAM for non-volatile logging. |
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 |
|---|---|---|---|
| STM32L432KCU6 | Same 32-pin UFQFPN package; adds USB DFU bootloader and higher-temp grade (–40 °C to 105 °C); no Quad-SPI interface. | Better suited for USB-reliant field-upgradable devices where external memory expansion is unnecessary. | Select when USB-based firmware updates are mandatory and external flash is not required. |
| STM32L552KET6 | ARMv8-M TrustZone security, 256 KB flash, 128 KB SRAM, 110 µA/MHz run mode; larger 32-pin LQFP package (7×7 mm). | Required for applications needing certified secure boot, cryptographic key isolation, and extended memory for OTA stacks. | Select when PSA Certified Level 2 or NIST SP 800-193 compliance is mandated for endpoint security. |
Compared with STM32L422KBU6, STM32L432KCU6 trades Quad-SPI for enhanced USB boot flexibility, while STM32L552KET6 introduces hardware-enforced security domains at higher power and footprint cost-making the L422 optimal for cost-sensitive, analog-rich, battery-constrained edge nodes.
Availability
STM32L422KBU6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, portable diagnostic tools, and industrial wireless sensor nodes requiring stable component supply across long-lifecycle deployments.
Supply support for STM32L422KBU6 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 management ICs, sensors, and analog products for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, integrated analog, and hardware security-optimized for battery-operated IoT endpoints and portable medical equipment.
FAQ
What is the maximum operating temperature range for STM32L422KBU6?
The STM32L422KBU6 is rated for operation from –40 °C to +85 °C ambient temperature. This industrial-grade range is validated per ST's DS12470 Rev 6 specification and applies to all low-power modes, including Standby with RTC and Stop 2. Thermal derating is not required within this envelope.
Does STM32L422KBU6 support hardware encryption for firmware updates?
Yes. The device integrates a dedicated AES-128/256 hardware accelerator and True Random Number Generator (TRNG), enabling authenticated encryption of firmware images and secure key derivation. These blocks operate independently of the CPU and are accessible via the STM32 HAL Cryptographic library.
Can the internal op-amp be used to drive ADC inputs directly?
Yes. The integrated operational amplifier supports unity-gain buffer and programmable gain configurations (1x–40x), with output directly routable to ADC input channels (e.g., PA4–PA7). Its rail-to-rail output and low input bias current (1 pA typical) make it suitable for driving SAR ADCs without external signal conditioning.
Is there a built-in temperature sensor, and what is its accuracy?
Yes. The device includes a calibrated on-die temperature sensor with ±1.5 °C accuracy over the full –40 °C to +85 °C range, referenced to VDDA. Calibration values are stored in system memory and accessible via HAL_Temperature_GetValue() in STM32CubeMX-generated code.
STM32L422KBU6 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:
- I2C, Infrared, IrDA, LINbus, Quad SPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 40K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L422KBU6 FAQ
1.How can I place an order for STM32L422KBU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L422KBU6 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 STM32L422KBU6 reliable?
The price and inventory of STM32L422KBU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L422KBU6 is usually 5 days.
3.What payment methods are accepted for STM32L422KBU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L422KBU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L422KBU6?
STM32L422KBU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L422KBU6 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 STM32L422KBU6?
For technical support, including STM32L422KBU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L422KBU6 requirements.
6.How does Aetrix verify that STM32L422KBU6 is sourced from the original manufacturer or authorized distributors?
All STM32L422KBU6 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 STM32L422KBU6 meets industry standards.
7.What is the process for return or replacement of STM32L422KBU6?
All STM32L422KBU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L422KBU6, 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 STM32L422KBU6 part is unused and in its original packaging.
Return procedure for STM32L422KBU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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