STMicroelectronics STM32L052C8U6

Overview

STM32L052C8U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, USB 2.0 crystal-less interface, and 12-bit ADC (1.14 Msps) - deployed in battery-powered IoT sensors and portable medical monitors requiring sub-1 µA Stop mode operation.

For engineers reviewing the STM32L052C8U6 datasheet, STM32L052C8U6 pinout, STM32L052C8U6 application, or STM32L052C8U6 equivalent, key selection criteria include verified 0.4 µA Stop mode current, 32 MHz max CPU frequency with 0.95 DMIPS/MHz, USB crystal-less timing accuracy, 45 5V-tolerant I/Os, and integrated true RNG for secure firmware updates.

Technical Context

The device implements a dual-voltage domain architecture with programmable voltage scaling (PVS) enabling dynamic adjustment between 1.65–3.6 V supply and three low-power operating ranges. Its clock system integrates factory-trimmed 16 MHz HSI (+/-1%), self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE for RTC - all managed via RCC with PLL support for CPU clock generation.

Analog subsystem includes two ultra-low-power comparators (operable down to 1.65 V), a 12-bit DAC with output buffer (down to 1.8 V), and capacitive sensing controller supporting up to 24 channels - all independently configurable while retaining RAM during Stop mode with RTC active.

Key Specifications

Pinout & Package

STM32L052C8U6 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5×5 mm with 0.5 mm pitch, optimized for space-constrained portable electronics. Thermal pad on underside enhances power dissipation in continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZT6 and STM32L432KCU6, the STM32L052C8U6 uniquely balances USB connectivity, sub-1 µA Stop mode, and ECC-protected EEPROM - making it optimal for cost-sensitive, battery-limited USB-peripheral designs where cryptographic offload or floating-point computation is unnecessary.

Availability

STM32L052C8U6 is available at Aetrix Electronics and suitable for smart wearables, portable medical monitors, industrial wireless nodes, and smart meter tamper detection requiring stable component supply across multi-year production cycles.

Supply support for STM32L052C8U6 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-grade components since 1987.

The STM32L0 series targets ultra-low-power embedded applications - specifically engineered for battery-operated devices needing extended runtime, robust security, and rich analog integration without sacrificing USB connectivity or code density.

FAQ

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

The STM32L052C8U6 achieves 32 MHz CPU frequency using the PLL with HSE or HSI16. At 32 MHz and 3.3 V, typical Run mode current is 88 µA/MHz (2.82 mA total), measured with code executing from Flash and peripherals active - values confirmed in Section 6.3.4 of DS10182 Rev 10.

Does the device support hardware-accelerated cryptography?

No, the STM32L052C8U6 does not include dedicated cryptographic accelerators. It relies on software libraries (e.g., Mbed TLS) for AES or SHA operations. For hardware crypto, consider STM32L072xx or STM32L4x2xx families - both explicitly list AES-128 and SHA-256 engines in their datasheets.

Can the USB interface operate without an external crystal?

Yes - the STM32L052C8U6 integrates a self-calibrating 48 MHz HSI48 RC oscillator qualified for USB full-speed (12 Mbps) operation without external crystal. Calibration uses LSE or HSE as reference, achieving ±0.25% accuracy per USB specification requirements.

How many I/O pins support capacitive sensing, and what is the minimum supply voltage for TSC operation?

The Touch Sensing Controller (TSC) supports up to 24 channels across GPIOs PA0–PA7, PB0–PB13, PC0–PC7, and PD0–PD2. TSC operates down to 1.65 V supply, matching the device's minimum VDD rating - enabling touch functionality even during brownout conditions.