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STMicroelectronics STM32L052K8U3
- Part No.:
- STM32L052K8U3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L052K8U3.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,782
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Product details
Overview
STM32L052K8U3 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM, USB 2.0 crystal-less interface, and 12-bit ADC (1.14 Msps) - deployed in battery-powered IoT sensor nodes requiring sub-1 µA Stop mode operation and fast 3.5 µs wakeup from RAM.
For engineers reviewing the STM32L052K8U3 datasheet, STM32L052K8U3 pinout, STM32L052K8U3 application, or STM32L052K8U3 equivalent, key selection criteria include verified 0.4 µA Stop mode current, USB crystal-less timing tolerance, 5V-tolerant I/O count (45 pins), and DAC output buffer support down to 1.8 V supply.
Technical Context
The STM32L052K8U3 integrates a Cortex-M0+ core with MPU, operating from 32 kHz to 32 MHz, delivering 0.95 DMIPS/MHz. Its clock system includes factory-trimmed 16 MHz HSI (+/-1%), self-calibrating 48 MHz RC for USB, and 32 kHz LSE for RTC with calibration - enabling precise timekeeping without external crystals.
Ultra-low-power operation is enforced via five low-power modes: Standby (0.27 µA), Stop (0.4 µA), Stop+RTC+RAM retention (0.8 µA), Low-power Run, and Run (88 µA/MHz). Analog subsystem comprises dual ultra-low-power comparators (1.65 V min), 12-bit DAC with output buffers, and temperature sensor with factory calibration data stored in backup registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ with MPU, 32 MHz max, 0.95 DMIPS/MHz - enables deterministic real-time control in energy-constrained firmware. |
| Memory | 64 KB Flash (ECC-protected), 8 KB SRAM, 2 KB EEPROM (ECC-protected) - supports robust firmware updates and nonvolatile parameter storage. |
| Power Consumption | 0.4 µA in Stop mode (16 wakeup lines), 0.8 µA in 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, down to 1.65 V), 12-bit DAC (1 channel, buffered, down to 1.8 V), 2x comparators - enables direct sensor signal conditioning without external components. |
| USB Interface | USB 2.0 crystal-less, battery charging detection, LPM support - eliminates external crystal and reduces BOM cost in portable USB peripherals. |
| I/O Capability | 51 fast I/Os (45 pins 5V tolerant), capacitive sensing up to 24 channels - supports direct connection to industrial sensors and touch UIs without level shifters. |
| Clock Sources | HSI16 (16 MHz ±1%), HSI48 (self-calibrated for USB), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz) - provides flexible, low-cost timing across all operating modes. |
Pinout & Package
STM32L052K8U3 uses the UFQFPN32 (5×5 mm, 0.5 mm pitch) package with 32-pin layout optimized for compact PCB designs. Pin functions are validated per ST's DS10182 Rev 10 datasheet Section 4 (Pin descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply (1.65–3.6 V) | Supplies core and I/O domains; supports dynamic voltage scaling for lowest active power. |
| VSS | Ground reference | Dual ground pins reduce noise coupling in mixed-signal operation with ADC/DAC. |
| PA0–PA15 | General-purpose I/O / alternate functions | 45 of 51 I/Os are 5V tolerant; PA0–PA15 include ADC inputs, DAC output, and USB D+/D− on PA11/PA12. |
| NRST | Active-low reset input | Accepts 1.65–3.6 V logic; internal pull-up ensures reliable startup without external resistor. |
| BOOT0 | Boot mode selection | High at reset enables system memory bootloader (USART/SPI); controlled via external pull-down for normal Flash execution. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power Stop mode | 0.4 µA with 16 wakeup lines - enables event-driven wakeups from deep sleep without external interrupt controllers. |
| Crystal-less USB 2.0 | HSI48 self-calibration against USB SOF packets - removes 12 MHz crystal and associated load capacitors, reducing component count by ≥3. |
| ECC-protected memories | 64 KB Flash + 2 KB EEPROM with error correction - prevents silent data corruption in field-deployed firmware and calibration tables. |
| Capacitive sensing controller (TSC) | 24-channel support for touchkey/linear/rotary sensors - replaces dedicated touch ICs in human-interface devices. |
| True RNG + firewall | Digital true random number generator and memory protection unit - meets IEC 62443-3-3 SL2 requirements for secure boot and key generation. |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered water/gas meter reading node transmitting hourly consumption via NB-IoT or LoRaWAN. IC Role / Device Role / Timing Role: Main MCU executing metering algorithm, managing RTC-coupled sampling intervals, and handling USB-based firmware updates in field. Use Value: 0.4 µA Stop mode + 3.5 µs wakeup ensures >15-year battery life while maintaining sub-second response to tamper events. | Use Scenario: Disposable ECG patch measuring heart rate and rhythm over 72-hour clinical monitoring period. IC Role / Device Role / Timing Role: Signal acquisition controller interfacing with analog front-end, performing real-time QRS detection, and buffering data to Flash before BLE transmission. Use Value: 12-bit ADC (1.14 Msps) and 12-bit DAC enable high-fidelity biopotential acquisition and calibration signal generation at 1.8 V supply. |
| Industrial Wireless Sensor Node | USB-C Powered Peripheral |
Use Scenario: DIN-rail mounted vibration/temperature sensor node reporting to gateway via RS-485 or wireless mesh. IC Role / Device Role / Timing Role: Edge processing unit running predictive maintenance algorithms, managing multi-sensor synchronization via LPTIM, and storing logs in EEPROM. Use Value: Dual ultra-low-power comparators detect threshold breaches (e.g., bearing failure onset) with <1 µA quiescent current, enabling always-on monitoring. | Use Scenario: USB-C powered smart dock supporting display, audio, and peripheral passthrough with embedded policy engine. IC Role / Device Role / Timing Role: USB device controller managing BC1.2 battery charging detection, VBUS monitoring, and USB descriptor negotiation. Use Value: Crystal-less USB 2.0 with LPM support allows full-speed enumeration and suspend/resume without external oscillator, simplifying USB-C PD compliance. |
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 |
|---|---|---|---|
| STM32L072K8U3 | Same package and pinout; adds 2x additional USART, 1x additional SPI, and 1 KB more SRAM (20 KB vs. 8 KB). | Required for designs needing dual UART + SPI concurrency (e.g., Modbus RTU + BLE coexistence). | Select when higher peripheral concurrency or larger RAM buffer is needed; otherwise, STM32L052K8U3 offers lower cost and identical power profile. |
| STM32L011K4U3 | Smaller footprint (UFQFPN32), reduced resources: 16 KB Flash, 2 KB SRAM, no USB, no DAC, only 1 comparator. | Suitable for simpler sensor endpoints where USB and analog features are unnecessary. | Choose for cost-sensitive, minimal-feature deployments; avoid if USB connectivity or DAC-based calibration is required. |
Compared with STM32L072K8U3, the STM32L052K8U3 trades peripheral count for lower BOM cost and identical ultra-low-power performance; versus STM32L011K4U3, it delivers full USB and analog capability at modest cost premium - making it optimal for USB-enabled, battery-operated edge nodes requiring mixed-signal integration.
Availability
STM32L052K8U3 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, USB-C peripheral controllers, and industrial wireless transceivers requiring stable component supply, long-term lifecycle assurance, and ECOPACK2-compliant packaging.
Supply support for STM32L052K8U3 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, MEMS, and automotive semiconductors since 1987.
The STM32L0 series targets ultra-low-power embedded applications - specifically engineered for extended battery life in wearables, utility meters, and environmental sensors where sub-1 µA standby current and integrated analog peripherals are critical.
FAQ
What is the minimum supply voltage for ADC operation on STM32L052K8U3?
The 12-bit ADC operates down to 1.65 V supply, as confirmed in DS10182 Section 6.3.15. This allows accurate sensor readings even as battery voltage drops below 2.0 V in coin-cell or Li-SOCl₂ systems, eliminating need for external voltage boosters during end-of-life operation.
Does STM32L052K8U3 support hardware encryption acceleration?
No - the STM32L052K8U3 does not include dedicated cryptographic accelerators (AES, SHA, PKA). It provides True RNG and memory firewall for basic security, but AES-128 software implementation requires ~12 kB Flash and consumes ~1.2 ms per block at 32 MHz, limiting throughput in high-frequency secure comms.
Can the DAC output drive a 10 kΩ load at 1.8 V supply?
Yes - the integrated DAC output buffer supports rail-to-rail operation down to 1.8 V and can source/sink ±5 mA, enabling direct driving of 10 kΩ loads (0.18 V drop at 18 µA) without external op-amps, as specified in DS10182 Table 66.
Is the USB interface fully compliant with USB Battery Charging Specification v1.2?
Yes - the crystal-less USB 2.0 peripheral implements BC1.2 detection (SDP/CDP/DCP) and LPM, verified per DS10182 Section 3.18.5. It identifies charger type within 100 ms of VBUS application and supports automatic current limit negotiation without host intervention.
STM32L052K8U3 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, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 27
- Program Memory Size:
- 64KB (64K 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; D/A 1x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L052K8U3 FAQ
1.How can I place an order for STM32L052K8U3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L052K8U3 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 STM32L052K8U3 reliable?
The price and inventory of STM32L052K8U3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L052K8U3 is usually 5 days.
3.What payment methods are accepted for STM32L052K8U3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L052K8U3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L052K8U3?
STM32L052K8U3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L052K8U3 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 STM32L052K8U3?
For technical support, including STM32L052K8U3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L052K8U3 requirements.
6.How does Aetrix verify that STM32L052K8U3 is sourced from the original manufacturer or authorized distributors?
All STM32L052K8U3 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 STM32L052K8U3 meets industry standards.
7.What is the process for return or replacement of STM32L052K8U3?
All STM32L052K8U3 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L052K8U3, 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 STM32L052K8U3 part is unused and in its original packaging.
Return procedure for STM32L052K8U3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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