STMicroelectronics STM32L052K6T6

Overview

STM32L052K6T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 32 MHz max CPU frequency, 64 KB Flash with ECC, 8 KB SRAM, and 2 KB EEPROM. It integrates USB 2.0 (crystal-less), 12-bit ADC (1.14 Msps, 16 channels), 12-bit DAC, two ultra-low-power comparators, and capacitive touch sensing-designed for battery-powered IoT sensor nodes requiring long runtime and mixed-signal control.

For engineers reviewing the STM32L052K6T6 datasheet, STM32L052K6T6 pinout, STM32L052K6T6 application, or STM32L052K6T6 equivalent, key selection criteria include standby current (0.27 µA), RTC + RAM retention in Stop mode (0.8 µA), USB crystal-less operation, 5V-tolerant I/O count (45 pins), and integrated true RNG with firewall protection.

Technical Context

The device implements a dual-voltage domain architecture with dynamic voltage scaling to optimize power across operating modes. Its Cortex-M0+ core includes a memory protection unit (MPU), supports Thumb-2 instruction set, and achieves 0.95 DMIPS/MHz performance at up to 32 MHz.

Low-power operation is enabled by seven distinct power modes-including Standby (0.27 µA), Stop + RTC + 8 KB RAM retention (0.8 µA), and Run mode (88 µA/MHz)-with sub-5 µs wakeup from Flash and 3.5 µs from RAM. Clock management integrates five oscillators: HSE (1–25 MHz), LSE (32 kHz), HSI16 (±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a self-calibrating 48 MHz RC for USB.

Key Specifications

Pinout & Package

STM32L052K6T6 is housed in a 32-pin LQFP package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant and ECOPACK2-certified. The package supports reflow soldering and offers mechanical robustness for industrial and consumer applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L052K6T6, STM32L072KBU6 prioritizes security over connectivity, while STM32L432KCU6 shifts focus to computational throughput at the expense of sub-µA power efficiency-making the K6T6 optimal for USB-enabled, battery-constrained sensing with minimal firmware footprint.

Availability

STM32L052K6T6 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial predictive maintenance nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L052K6T6 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM32L0 series targets ultra-low-power embedded applications-designed specifically for battery-operated devices demanding multi-year runtime, secure firmware execution, and rich analog integration without external support components.

FAQ

What is the minimum supply voltage for full functionality including ADC and USB?

The STM32L052K6T6 operates fully from 1.65 V to 3.6 V. The 12-bit ADC functions down to 1.65 V, and the crystal-less USB interface requires ≥1.8 V for reliable operation. Below 1.8 V, USB is disabled but all other peripherals-including RTC, comparators, and GPIO-remain functional in low-voltage modes.

Does the part include factory-programmed bootloader support, and which interfaces are enabled?

Yes, STM32L052K6T6 includes a pre-programmed system memory bootloader supporting USART (via PA9/PA10) and SPI (via PA4/PA5/PA6/PA7). The bootloader is activated via BOOT0 pin and allows firmware updates without a debugger, enabling field upgrades over serial or SPI-connected host controllers.

How many capacitive sensing channels are supported, and what GPIOs are dedicated?

The device supports up to 24 capacitive sensing channels via its integrated Touch Sensing Controller (TSC). Dedicated GPIOs include PA0–PA7, PB0–PB1, PC0–PC7, and PH0–PH1-totaling 24 pins with programmable sensitivity and noise immunity. Channel mapping is configurable per application via TSC registers.

Is the 2 KB EEPROM truly independent of Flash, and what endurance rating does it have?

Yes, the 2 KB data EEPROM is physically separate from Flash memory and features independent read/write control. It guarantees 100,000 write/erase cycles and 20-year data retention at 55 °C, with ECC protection ensuring bit-error-free operation across its lifetime-critical for storing calibration constants or usage logs.