STMicroelectronics STM32L011K4U6TR

Overview

STM32L011K4U6TR 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 targets battery-powered IoT sensors, smart meters, and wearable medical devices requiring sub-1 µA standby current and fast 5 µs wakeup from Flash.

For engineers reviewing the STM32L011K4U6TR datasheet, STM32L011K4U6TR pinout, STM32L011K4U6TR application, or STM32L011K4U6TR equivalent, key selection criteria include ultra-low-power mode timing (0.23 µA Standby), integrated EEPROM retention, 23 I/Os with 5V tolerance, and SWD debug support for constrained embedded designs.

Technical Context

The device implements a dual-voltage domain architecture with programmable voltage scaling (PVS) enabling dynamic adjustment of core voltage to match CPU frequency (32 kHz–32 MHz), directly linking power consumption to real-time processing load. Its clock system integrates five independent sources - HSI16 (±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), LSE (32.768 kHz), and external crystal - with automatic fallback and calibration for RTC accuracy.

Low-power operation is enforced via hardware-controlled entry/exit sequences across seven modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby), each with distinct peripheral availability and retention policies; e.g., Stop mode retains 2 KB RAM and RTC while consuming only 0.54 µA, and Standby mode enables wake-up from two dedicated pins at 0.23 µA.

Key Specifications

Pinout & Package

STM32L011K4U6TR uses the UFQFPN20 (3 × 3 mm, 0.5 mm pitch) package with 20 terminals. This compact, leadless package supports reflow soldering and offers excellent 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 STM32L031K4U6, STM32L011K4U6TR reduces BOM cost by omitting unused peripherals while retaining identical ultra-low-power performance; versus EFM32ZG222F32, it delivers stronger data reliability via on-chip EEPROM ECC and simplifies firmware deployment with factory bootloader support.

Availability

STM32L011K4U6TR is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across long-lifecycle deployments.

Supply support for STM32L011K4U6TR 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 Access line targets cost-sensitive, battery-powered applications demanding sub-1 µA standby current, integrated nonvolatile memory, and robust low-power peripheral sets - optimized for IoT edge nodes and portable medical devices.

FAQ

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

The STM32L011K4U6TR achieves up to 32 MHz CPU frequency with dynamic voltage scaling. At 32 MHz and 3.3 V, typical Run mode current is 76 µA/MHz (2.43 mA total), verified per datasheet Table 22. Power scales linearly with frequency and voltage, enabling precise budgeting for intermittent high-speed tasks like ADC burst sampling or cryptographic operations.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L011K4U6TR does not integrate hardware AES, SHA, or secure boot engines. It relies on software-based cryptography libraries. For secure boot, external secure elements or higher-series STM32L4/L5 MCUs with TRNG and PKA must be used. This part prioritizes ultra-low static power over security acceleration.

Can the 512 B EEPROM be rewritten independently of Flash memory?

Yes, the 512 B data EEPROM supports byte-level erase/write operations independent of Flash. It uses the same ECC engine and endurance rating (100 kcycles), allowing frequent parameter updates (e.g., calibration coefficients, device IDs) without wearing Flash sectors or requiring full Flash reprogramming.

Is the UFQFPN20 package RoHS-compliant and halogen-free?

Yes, STM32L011K4U6TR in UFQFPN20 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The "ECOPACK®2" designation in the datasheet confirms compliance with ST's environmental standards, including lead-free terminations and restricted substance declarations.