STMicroelectronics STM32L052C8T7

Overview

STM32L052C8T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 64 KB Flash, 8 KB SRAM, and 2 KB EEPROM with ECC; integrated USB 2.0 (crystal-less), 12-bit ADC (1.14 Msps, 16 channels), and 12-bit DAC; designed for battery-powered IoT sensors and portable medical devices operating from 1.65–3.6 V.

For engineers reviewing the STM32L052C8T7 datasheet, STM32L052C8T7 pinout, STM32L052C8T7 application, or STM32L052C8T7 equivalent, key selection criteria include standby current (0.27 µA), wakeup time (3.5 µs from RAM), USB crystal-less operation, 5V-tolerant I/O count (45 pins), and embedded true RNG with firewall protection.

Technical Context

The STM32L052C8T7 implements a dual-voltage domain architecture supporting dynamic voltage scaling across three power ranges (1.65–3.6 V), enabling optimized trade-offs between performance (up to 32 MHz) and ultra-low-power operation. Its clock system integrates six independent sources: HSE (1–25 MHz), LSE (32 kHz), HSI16 (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and HSI48 (48 MHz, self-calibrated for USB).

Low-power operation is enforced via five distinct modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with dedicated hardware blocks including ultra-low-power comparators (wakeup capable down to 1.65 V), RTC with 20-byte backup registers, and a 16-bit ultra-low-power timer (LPTIM). Memory subsystem includes ECC-protected Flash and EEPROM plus 8-KB SRAM with selective retention in Stop mode.

Key Specifications

Pinout & Package

STM32L052C8T7 is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts in wearables and smart sensors. The package supports reflow soldering and meets ECOPACK2 environmental compliance.

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 STM32L052C8T7 uniquely balances USB connectivity, ultra-low standby current (0.27 µA), and integrated analog (ADC/DAC/comparators) in a compact 7×7 mm package - making it optimal for cost-sensitive, battery-limited USB-peripheral designs where security or FPU are secondary.

Availability

STM32L052C8T7 is available at Aetrix Electronics and suitable for portable medical devices, smart wearables, industrial wireless sensors, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L052C8T7 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 series targets ultra-low-power embedded applications demanding multi-year battery life, including IoT edge nodes, portable diagnostics, and energy-harvesting systems - emphasizing power efficiency without sacrificing peripheral richness or security.

FAQ

What is the maximum operating frequency and corresponding voltage range for STM32L052C8T7?

The STM32L052C8T7 operates up to 32 MHz at VDD ≥ 2.4 V. At lower voltages, frequency is scaled: 24 MHz at 2.0–2.4 V, 16 MHz at 1.8–2.0 V, and 8 MHz at 1.65–1.8 V. This dynamic voltage scaling is managed automatically by the embedded regulator and ensures optimal power/performance trade-offs across battery discharge profiles.

Does STM32L052C8T7 support USB without an external crystal?

Yes. The STM32L052C8T7 integrates a factory-trimmed 48 MHz RC oscillator (HSI48) with self-calibration against the USB SOF signal, achieving ±0.25% accuracy required for full-speed USB 2.0 communication. No external crystal or oscillator is needed, reducing BOM cost and PCB footprint.

How many I/O pins are 5V-tolerant, and what is their absolute maximum rating?

45 of the 51 I/O pins on the STM32L052C8T7 are 5V-tolerant, meaning they accept input voltages up to 5.5 V regardless of VDD level (1.65–3.6 V). This allows direct interfacing with legacy 5V peripherals such as sensors, displays, or logic ICs without level-shifting circuitry.

What is the endurance and data retention specification for the embedded 2 KB EEPROM?

The 2 KB data EEPROM is rated for 100,000 write/erase cycles and guarantees data retention for 20 years at 55 °C or 40 years at 25 °C. It includes built-in ECC and hardware wear-leveling, eliminating the need for external EEPROM in applications requiring frequent parameter storage (e.g., calibration coefficients, device configuration).