STMicroelectronics STM32L052C6U6

Overview

STM32L052C6U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 32 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and USB 2.0 crystal-less interface. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and delivers 0.27 µA standby current with 2 wakeup pins - ideal for battery-powered IoT sensor nodes requiring long-life operation and integrated analog peripherals.

For engineers reviewing the STM32L052C6U6 datasheet, STM32L052C6U6 pinout, STM32L052C6U6 application, or STM32L052C6U6 equivalent, key selection criteria include ultra-low-power mode timing (3.5 µs wakeup from RAM), USB crystal-less capability, 5V-tolerant I/O count (45 pins), and embedded true RNG + firewall protection for secure edge sensing deployments.

Technical Context

The STM32L052C6U6 integrates a Cortex-M0+ core with MPU, running up to 32 MHz via PLL or internal 16 MHz RC (±1% factory trim). Its clock system includes dedicated 48 MHz RC calibrated for USB, 32 kHz RTC oscillator with calibration, and multispeed MSI (65 kHz–4.2 MHz) supporting dynamic voltage scaling.

Low-power architecture combines five operational modes (Run, Sleep, Low-power Run, Stop, Standby), with hardware-accelerated wake-up sources including 16 Stop-mode wakeup lines, two ultra-low-power comparators (down to 1.65 V), and capacitive touch sensing on up to 24 channels - enabling direct integration into energy-constrained human-interface and environmental monitoring systems.

Key Specifications

Pinout & Package

STM32L052C6U6 uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32-pin layout optimized for compact PCB designs and thermal efficiency in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L052C6U6, STM32L053C6U6 adds LCD driving at no power penalty beyond display bias, while STM32L072CZT6 trades compactness for expanded memory and CAN FD - making the C6U6 optimal for minimal-footprint, USB-connected sensor endpoints where display or fieldbus are unnecessary.

Availability

STM32L052C6U6 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial sensor nodes, and secure asset trackers requiring stable component supply and long-term manufacturability.

Supply support for STM32L052C6U6 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 devices for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog functionality, and security features - with the L052 variant optimized for cost-sensitive, USB-connected edge sensing solutions.

FAQ

What is the maximum operating frequency of the STM32L052C6U6?

The STM32L052C6U6 achieves a maximum CPU frequency of 32 MHz using its PLL, which can be driven by the internal 16 MHz HSI or external crystal sources. The core runs at this speed only when supplied within the full 1.65–3.6 V range and with appropriate voltage scaling enabled; at lower voltages, max frequency is reduced per datasheet Table 4.

Does the STM32L052C6U6 support USB without an external crystal?

Yes - it integrates a factory-calibrated 48 MHz RC oscillator specifically for USB 2.0 full-speed operation, eliminating the need for an external crystal or oscillator. This feature is confirmed in Section 3.18.5 of DS10182 Rev 10 and enables crystal-less USB connectivity with ±0.25% accuracy over temperature and voltage.

How many I/O pins are 5V tolerant on the STM32L052C6U6?

45 of the 51 general-purpose I/Os are 5V tolerant when VDD is ≥2.0 V, as specified in Section 3.7 and Table 59 of the datasheet. This allows direct interfacing with legacy 5V peripherals such as UART transceivers or digital sensors without level-shifting circuitry.

What is the endurance rating of the embedded EEPROM?

The 2 KB embedded EEPROM supports 100,000 write/erase cycles and 20-year data retention at 55 °C, with built-in ECC for error correction. These values are specified in Table 53 of DS10182 Rev 10 and validated across the full industrial temperature range (–40 °C to +125 °C).