STMicroelectronics STM32L011K3U6

Overview

STM32L011K3U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN20 (3×3 mm) package, featuring 16 KB Flash, 2 KB SRAM, 512 B EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.95 DMIPS/MHz performance and supports 0.23 µA Standby mode with 2 wakeup pins - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L011K3U6 datasheet, STM32L011K3U6 pinout, STM32L011K3U6 application, or STM32L011K3U6 equivalent, key selection criteria include ultra-low active/standby current, integrated EEPROM retention, 5V-tolerant I/Os (23 of 28), RTC + backup registers, and SWD debug support in compact 20-pin QFN.

Technical Context

The STM32L011K3U6 implements a single-core Arm Cortex-M0+ running at up to 32 MHz, with dynamic voltage scaling enabling three power modes (Run, Low-power Run, Sleep) and four low-power states (Stop, Stop+RTC, Standby, Shutdown). Its clock system integrates factory-trimmed 16 MHz HSI (±1%), 37 kHz LSI, 65 kHz–4.2 MHz MSI, 32 kHz LSE for RTC, and PLL for CPU clock multiplication.

Peripheral interconnect uses a centralized AHB/APB matrix supporting concurrent DMA transfers across ADC, USART, SPI, I²C, and timers. The device includes two ultra-low-power comparators (operable down to 1.65 V), temperature sensor, VREFINT, CRC unit, and 96-bit unique ID - all optimized for deterministic real-time response under sub-100 µA average system current.

Key Specifications

Pinout & Package

STM32L011K3U6 is housed in a 20-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN20) package, 3×3 mm body, 0.5 mm pitch, with exposed thermal pad. This RoHS-compliant ECOPACK®2 package supports automated optical inspection and offers superior thermal performance for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L031K3U6, the STM32L011K3U6 reduces BOM cost by omitting DAC while retaining identical ultra-low-power performance and EEPROM - making it optimal for cost-sensitive, data-logging sensor endpoints. Versus EFM32ZG108F16, it provides critical 5V-tolerant I/Os and on-chip EEPROM without external components, simplifying design validation and long-term field reliability.

Availability

STM32L011K3U6 is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical devices, and industrial predictive maintenance requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L011K3U6 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 STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated peripherals, and robustness in extended-temperature and battery-operated environments - with STM32L011K3U6 optimized for minimal footprint and maximum runtime per joule.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L011K3U6 operates up to 32 MHz with 0.95 DMIPS/MHz performance. At 32 MHz and 3.3 V, typical Run-mode current is 76 µA/MHz (2.43 mA total), measured with code executing from Flash and peripherals idle. Current scales linearly with frequency and voltage, dropping to ~38 µA/MHz at 1.8 V per datasheet Section 6.3.4.

Does STM32L011K3U6 support hardware encryption or secure boot?

No - the STM32L011K3U6 does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based encryption libraries and external secure elements for advanced security. Its TRNG is also absent; true random number generation requires external IC or analog-noise-based software methods.

Can the internal 16 MHz RC oscillator be used as the system clock without calibration?

Yes - the 16 MHz HSI oscillator is factory-trimmed to ±1% accuracy across voltage and temperature, enabling immediate use as the system clock without external crystal or runtime calibration. For higher precision (e.g., USB or precise timing), an external crystal or LSE-backed RTC calibration is recommended.

How many I/O pins support 5V tolerance, and which ones are they?

23 of the 28 GPIOs are 5V tolerant: PA0–PA7 and PA10–PA15. Pins PA8, PA9, PA12, PB0, and PB1 are not 5V tolerant and must remain within VDD (≤3.6 V). This configuration allows direct interfacing with 5 V logic peripherals (e.g., legacy sensors, displays, or level translators) while preserving signal integrity on sensitive analog inputs.