STMicroelectronics STM32L011K4T6

Overview

STM32L011K4T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 32-pin LQFP package, featuring 16 KB Flash, 2 KB SRAM, 512 B EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and targets battery-powered IoT sensors and smart metering endpoints requiring sub-1 µA standby current and fast 5 µs wake-up from Flash.

For engineers reviewing the STM32L011K4T6 datasheet, STM32L011K4T6 pinout, STM32L011K4T6 application, or STM32L011K4T6 equivalent, key selection considerations include its 0.23 µA Standby mode (2 wakeup pins), 76 µA/MHz Run-mode efficiency, 16 MHz factory-trimmed HSI oscillator (±1%), integrated RTC with 2 KB RAM retention, and support for ISO 7816/USART, SPI (16 Mbit/s), and I²C (SMBus/PMBus) interfaces.

Technical Context

The STM32L011K4T6 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 five independent sources: HSI16 (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), LSE (32.768 kHz), and external crystal up to 32 MHz - all configurable via RCC registers and supporting PLL multiplication for CPU clock generation.

Analog subsystem includes a 12-bit ADC with up to 10 channels, sampling at 1.14 Msps down to 1.65 V supply, two rail-to-rail comparators with window mode and wake-up capability, and internal temperature sensor with calibrated reference. Memory protection covers Flash sector write/erase lock, read-out protection (RDP), and hardware ECC on both Flash and EEPROM.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch), RoHS-compliant and ECOPACK®2 certified. Pin count and layout match industry-standard 32-pin LQFP footprint for drop-in compatibility with PCB designs targeting STM32L0 series MCUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031K4T6, the STM32L011K4T6 trades analog output capability for cost and pin-count reduction; versus EFM32ZG108F16, it prioritizes embedded security (96-bit UID, ROP), EEPROM data persistence, and industrial-grade RTC functionality over marginal standby savings.

Availability

STM32L011K4T6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, wearable health monitors, and industrial predictive maintenance sensors requiring stable component supply, long-term lifecycle assurance, and qualified automotive/industrial temperature grade (-40 °C to +125 °C).

Supply support for STM32L011K4T6 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 analog components for industrial, automotive, and consumer markets.

The STM32L0 Access line targets cost-sensitive, ultra-low-power applications demanding robustness, integrated peripherals, and long battery life - optimized for simple, reliable deployment in disposable and maintenance-free edge devices.

FAQ

Does STM32L011K4T6 support USB connectivity?

No, the STM32L011K4T6 does not integrate a USB peripheral or PHY. It provides USART, LPUART, SPI, and I²C for wired communication, and can interface with external USB-to-serial bridge ICs (e.g., CP2102, FT232RL) if host PC connectivity is required. USB-capable variants exist in the STM32L05x and STM32L07x families.

What is the maximum operating frequency with internal HSI16 oscillator?

The internal 16 MHz HSI16 oscillator is factory-trimmed to ±1% accuracy and supports full 32 MHz CPU operation when used with the integrated PLL (×2 multiplication). No external crystal is required for this configuration, making it ideal for cost-sensitive designs where absolute timing precision is secondary to low component count.

Can the 512 B EEPROM be used for storing calibration data across power cycles?

Yes, the 512 B data EEPROM features hardware ECC and guaranteed endurance of 100,000 write/erase cycles with 20-year data retention at 55 °C. It is specifically designed for nonvolatile storage of sensor calibration coefficients, device identifiers, or configuration parameters that must survive power loss and repeated field updates.

Is SWD debug supported with full breakpoint and trace capability?

Serial Wire Debug (SW-DP) is fully supported with hardware breakpoints, watchpoints, and memory access via SWDIO/SWCLK pins. However, the STM32L011K4T6 does not include an Embedded Trace Macrocell (ETM) or ITM; real-time instruction trace is unavailable. SWV (Serial Wire Viewer) is supported for printf-style debug output and event tracing using the SWO pin.