STMicroelectronics STM32L052K6U6

Overview

STM32L052K6U6 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, 2 KB EEPROM with ECC, USB 2.0 crystal-less interface, and 12-bit ADC (1.14 Msps). It targets battery-powered IoT sensor nodes requiring long runtime and integrated analog peripherals.

For engineers reviewing the STM32L052K6U6 datasheet, STM32L052K6U6 pinout, STM32L052K6U6 application, or STM32L052K6U6 equivalent, key selection criteria include standby current (0.27 µA), USB crystal-less operation, 12-bit DAC with buffer, ultra-low-power comparators, and capacitive touch sensing support up to 24 channels.

Technical Context

The STM32L052K6U6 integrates an Arm Cortex-M0+ core with MPU, operating from 32 kHz to 32 MHz, delivering 0.95 DMIPS/MHz. Its power architecture supports five low-power modes - Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby - with sub-µA retention states and 3.5 µs wakeup from RAM.

Analog subsystem includes a 12-bit ADC (16-channel, down to 1.65 V), 1-channel 12-bit DAC with output buffer (down to 1.8 V), two ultra-low-power comparators with window mode and wake-up capability, and a dedicated Touch Sensing Controller (TSC) supporting 24 capacitive sensing channels.

Key Specifications

Pinout & Package

STM32L052K6U6 is housed in a 32-pin UFQFPN (5×5 mm, 0.5 mm pitch) package compliant with ECOPACK2 environmental standards. The package supports compact PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L052K6U6, STM32L072KBU6 offers enhanced security and memory for complex edge processing, while STM32L011K4U6 reduces cost and size for basic sensing - both maintain the same ultra-low-power foundation and pinout compatibility.

Availability

STM32L052K6U6 is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial wireless sensor nodes, and smart home door locks requiring stable component supply and long-term manufacturability.

Supply support for STM32L052K6U6 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 is engineered for ultra-low-power embedded applications demanding multi-year battery life, integrated analog functionality, and robust security - targeting IoT edge nodes and portable medical devices.

FAQ

What is the minimum operating voltage for STM32L052K6U6?

The STM32L052K6U6 operates from 1.65 V to 3.6 V. At 1.65 V, it supports Run mode at reduced frequencies (up to 2 MHz) and retains full peripheral functionality including ADC (down to 1.65 V) and comparators (down to 1.65 V), enabling operation across the full discharge curve of lithium-thionyl chloride or alkaline batteries.

Does STM32L052K6U6 support USB without an external crystal?

Yes. The device integrates a factory-trimmed 48 MHz HSI48 RC oscillator with automatic calibration against the USB SOF signal, enabling full-speed USB 2.0 communication without an external crystal - reducing BOM cost and PCB area while maintaining USB-IF compliance.

How many capacitive sensing channels does STM32L052K6U6 support?

The STM32L052K6U6 supports up to 24 capacitive sensing channels via its integrated Touch Sensing Controller (TSC), with dedicated GPIO mapping across PA0–PA7, PB0–PB12, and PC0–PC7 - enabling implementation of touchkeys, linear sliders, and rotary wheels without external components.

Is the 2 KB EEPROM truly persistent with ECC protection?

Yes. The 2 KB data EEPROM includes hardware ECC (error-correcting code) that detects and corrects single-bit errors and detects double-bit errors during read/write operations. Endurance is rated at 100,000 write/erase cycles and data retention exceeds 20 years at 55 °C, validated per ST's production qualification tests.