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STMicroelectronics STM32L051K6U6
- Part No.:
- STM32L051K6U6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L051K6U6.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,666
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Product details
Overview
STM32L051K6U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 32 MHz max CPU frequency, 32 KB Flash, 8 KB SRAM, and 2 KB EEPROM with ECC. It integrates a 12-bit ADC (1.14 Msps), two ultra-low-power comparators, seven timers including RTC and LPTIM, and communication interfaces including 2× USART, 2× I2C, and up to 4× SPI - deployed in battery-powered sensor nodes and smart metering endpoints.
For engineers reviewing the STM32L051K6U6 datasheet, STM32L051K6U6 pinout, STM32L051K6U6 application, or STM32L051K6U6 equivalent, key selection criteria include standby current (0.27 µA), wakeup time from RAM (3.5 µs), 5V-tolerant I/O count (45), EEPROM endurance (100k cycles), and support for serial wire debug (SW-DP) in space-constrained industrial IoT designs.
Technical Context
The STM32L051K6U6 implements dynamic voltage scaling and multiple low-power modes (Run, Sleep, Stop, Standby) with hardware-assisted wake-up via 16 lines or 2 dedicated pins. Its Cortex-M0+ core includes a memory protection unit (MPU) and executes at 0.95 DMIPS/MHz, supporting deterministic real-time response in energy-harvesting systems.
On-chip clock architecture combines five sources: HSE (1–25 MHz), LSE (32 kHz), HSI16 (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), with PLL enabling precise CPU clock derivation. Analog subsystem operates down to 1.65 V supply, enabling direct interfacing with low-voltage sensors without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M0+ with MPU, 32 MHz max - enables deterministic real-time control with memory isolation for firmware partitioning. |
| Memory | 32 KB Flash (ECC-protected), 8 KB SRAM, 2 KB EEPROM (ECC, 100k write/erase cycles) - supports robust firmware storage and nonvolatile parameter retention across power cycles. |
| Power Consumption | 0.27 µA Standby (2 wakeup pins), 0.8 µA Stop + RTC + 8 KB RAM retention - extends coin-cell battery life to >10 years in periodic-sensing applications. |
| Analog Peripherals | 12-bit ADC (1.14 Msps, 16 channels, min 1.65 V operation), 2x comparators (window mode, wake-up capable) - enables direct high-resolution sensor acquisition without external signal conditioning. |
| I/O & Interfaces | Up to 27 GPIOs (45 I/Os total across variants; 45 are 5V-tolerant), 2× USART (ISO 7816/IrDA), 2× I2C (SMBus/PMBus), up to 4× SPI - supports mixed-voltage peripheral connectivity and secure smart-card protocols. |
| Timers & Debug | 9 timers including RTC, LPTIM, SysTick, 2× watchdogs (IWDG/WWDG); Serial Wire Debug (SW-DP) - provides precise timekeeping, ultra-low-power timing, and production-grade firmware validation. |
Pinout & Package
STM32L051K6U6 is housed in a 32-pin UFQFPN (5×5 mm, 0.5 mm pitch) package compliant with ECOPACK2 environmental standards. The package supports reflow soldering and offers compact footprint for wearables and portable medical devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O power supply | 1.65–3.6 V input; powers digital logic and 5V-tolerant I/Os - requires local 100 nF decoupling per VDD pin. |
| VSS | Ground reference | Digital ground return; separate analog ground (VSSA) available - must be connected to minimize noise coupling into ADC/comparators. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.65–3.6 V logic - enables external reset button or supervisor IC integration. |
| PA0–PA15 | General-purpose I/O bank A | Up to 16 configurable pins; many support alternate functions (USART2_TX, TIM2_CH1, ADC_IN0, etc.) - enables flexible peripheral mapping in layout-constrained designs. |
| PB0–PB11 | General-purpose I/O bank B | Up to 12 pins; includes I2C1_SCL/SDA, USART1_TX/RX, LPTIM1_IN1 - supports dual-interface communication on shared pins via remapping. |
| BOOT0 | Boot mode selection | High at reset enters system memory bootloader (USART/SPI); low boots from main Flash - enables field firmware updates without debugger. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby mode | 0.27 µA with 2 wakeup pins active - reduces average current in intermittently active sensor nodes by >99% vs standard MCUs. |
| Embedded EEPROM with ECC | 2 KB data EEPROM with error correction - eliminates need for external serial EEPROM in tamper-resistant metering applications. |
| ADC with hardware oversampling | 12-bit resolution at 1.14 Msps, extendable to 16-bit via oversampling - replaces external precision ADC in cost-sensitive industrial transmitters. |
| Low-power timer (LPTIM) | 16-bit counter running from LSE/LSI/ULPCLK - enables sub-second timing accuracy during Stop mode for duty-cycled wireless transmission. |
| 5V-tolerant I/Os | 45 pins tolerant to 5.5 V - simplifies interface to legacy 5V peripherals (e.g., RS-232 transceivers, optocouplers) without level shifters. |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
Use Scenario: Gas/water meter with pulse counting, temperature compensation, and LoRaWAN backhaul. IC Role / Device Role / Timing Role: Main controller managing metrology ADC sampling, RTC-based billing intervals, and low-power radio sleep/wake coordination. Use Value: 0.8 µA Stop+RTC mode enables >5-year battery life; 2 KB EEPROM stores calibration coefficients and tamper logs with ECC integrity. |
Use Scenario: Battery-powered environmental monitor (temp/humidity/pressure) transmitting hourly via BLE or NB-IoT. IC Role / Device Role / Timing Role: System-on-chip handling sensor readout, data preprocessing, and ultra-low-power radio control using LPTIM-triggered wakeups. Use Value: 3.5 µs wakeup from RAM allows rapid sensor sampling bursts; 45 5V-tolerant I/Os interface directly to analog front-end ICs without level shifters. |
| Portable Medical Device | Industrial Control Edge Node |
Use Scenario: Handheld blood glucose meter with LCD, button interface, and USB charging. IC Role / Device Role / Timing Role: Primary MCU executing FDA-compliant algorithm, managing touch-button debouncing, and controlling segmented LCD driver. Use Value: 12-bit ADC with internal reference measures biosensor current with <±2 LSB INL; 8 KB SRAM retains full session history during deep sleep. |
Use Scenario: DIN-rail mounted PLC I/O module monitoring 8-channel 4–20 mA loops with local diagnostics. IC Role / Device Role / Timing Role: Isolated analog front-end controller performing loop-powered ADC conversion, CRC-checked data framing, and watchdog-monitored UART comms to master. Use Value: Dual comparators enable fast overcurrent detection (<1 µs response); 32 KB Flash accommodates dual-bank firmware for safe field updates. |
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 |
|---|---|---|---|
| STM32L071K8U6 | 64 KB Flash, 20 KB SRAM, same package/peripherals - adds USB 2.0 FS device, more timers, larger memory. | Required for USB-connected diagnostic tools or firmware update via USB mass storage. | Select when USB connectivity or >32 KB code space is mandatory; otherwise STM32L051K6U6 offers lower cost and identical low-power profile. |
| EFM32PG12B500F1024GL125 | ARM Cortex-M4, 1024 KB Flash, 256 KB RAM, 1.42 µA deep sleep - higher performance but larger footprint (QFN64). | Suitable for complex edge AI inference or multi-protocol gateways needing >100 DMIPS. | Choose only if computational throughput exceeds Cortex-M0+ limits; STM32L051K6U6 remains optimal for sub-10 µA always-on sensing. |
Compared with STM32L071K8U6, the STM32L051K6U6 trades Flash/SRAM capacity for lower BOM cost and identical ultra-low-power behavior; versus EFM32PG12B500, it delivers better power efficiency below 1 MHz and fits in half the PCB area - making it superior for size- and battery-limited embedded endpoints.
Availability
STM32L051K6U6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and industrial control edge nodes requiring stable component supply across multi-year production cycles.
Supply support for STM32L051K6U6 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 automotive semiconductors since 1987.
The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, robust security features, and seamless integration of analog/mixed-signal peripherals - optimized for metering, wearables, and industrial IoT endpoints.
FAQ
What is the maximum operating temperature range for STM32L051K6U6?
The STM32L051K6U6 is rated for industrial operation from –40 °C to +125 °C ambient temperature. This specification is validated per JEDEC JESD22-A104 and applies across all supply voltages (1.65–3.6 V) and functional modes, including full-speed 32 MHz operation with all peripherals enabled.
Does STM32L051K6U6 support hardware encryption or secure boot?
No - the STM32L051K6U6 does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-implemented algorithms and optional external secure elements. For certified secure boot, ST recommends STM32L5 or STM32U5 series MCUs with TrustZone and embedded root-of-trust.
Can the 2 KB EEPROM be used for storing calibration data across power cycles?
Yes - the 2 KB data EEPROM supports 100,000 write/erase cycles and 20-year data retention at 55 °C. It includes built-in ECC for single-bit error correction and double-bit error detection, making it suitable for storing sensor calibration coefficients, device serial numbers, and usage counters in field-deployed equipment.
Is SWD debugging supported in all low-power modes?
Serial Wire Debug (SW-DP) remains accessible in Run, Sleep, and Stop modes, but is disabled in Standby mode. Debug connection can be re-established after wakeup without reset, enabling real-time trace and register inspection during low-power operation - verified per RM0377 reference manual section 42.4.3.
STM32L051K6U6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L0
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 32MHz
- Connectivity:
- I2C, IrDA, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 27
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 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:
STM32L051K6U6 FAQ
1.How can I place an order for STM32L051K6U6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051K6U6 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 STM32L051K6U6 reliable?
The price and inventory of STM32L051K6U6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051K6U6 is usually 5 days.
3.What payment methods are accepted for STM32L051K6U6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051K6U6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051K6U6?
STM32L051K6U6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051K6U6 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 STM32L051K6U6?
For technical support, including STM32L051K6U6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051K6U6 requirements.
6.How does Aetrix verify that STM32L051K6U6 is sourced from the original manufacturer or authorized distributors?
All STM32L051K6U6 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 STM32L051K6U6 meets industry standards.
7.What is the process for return or replacement of STM32L051K6U6?
All STM32L051K6U6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051K6U6, 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 STM32L051K6U6 part is unused and in its original packaging.
Return procedure for STM32L051K6U6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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