STMicroelectronics STM32L052K6U7

Overview

STM32L052K6U7 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, USB 2.0 crystal-less interface, and 12-bit ADC (1.14 Msps) - deployed in battery-powered IoT sensors and portable medical devices requiring sub-µA standby current and fast wake-up.

For engineers reviewing the STM32L052K6U7 datasheet, STM32L052K6U7 pinout, STM32L052K6U7 application, or STM32L052K6U7 equivalent, key selection criteria include ultra-low-power mode timing (0.27 µA Standby, 3.5 µs RAM wake-up), integrated USB clock recovery (HSI48 self-calibration), and 45 I/Os with 5V tolerance - critical for energy-constrained edge node designs.

Technical Context

The STM32L052K6U7 implements a dual-voltage domain architecture with programmable voltage scaling (PVS) enabling dynamic core voltage adjustment across Run, Low-power Run, and Sleep modes. Its clock system integrates six independent sources - including factory-trimmed 16 MHz HSI, self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE for RTC - coordinated via a multi-layer interconnect matrix supporting concurrent peripheral access without arbitration stalls.

Power management includes five brownout reset (BOR) thresholds, programmable voltage detector (PVD), and dedicated low-power regulators for analog and digital domains. The MCU supports seven low-power states (Run to Standby), with retention of 8 KB SRAM and RTC in Stop mode at 0.8 µA - enabled by hardware-controlled power gating and state-preserving wakeup logic on 16 lines.

Key Specifications

Pinout & Package

STM32L052K6U7 uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32-pin layout optimized for compact, thermally efficient PCB layouts 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 STM32L072KBU7, the STM32L052K6U7 trades Flash/SRAM capacity and crypto features for lower unit cost and identical ultra-low-power behavior; versus STM32L011K4U7, it adds USB and DAC at modest cost premium - making it optimal for USB-connected, analog-rich edge nodes.

Availability

STM32L052K6U7 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial wireless sensor nodes, and USB-C powered accessories requiring stable component supply and long-term lifecycle support.

Supply support for STM32L052K6U7 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, specializing in microcontrollers, power management, and MEMS sensors - serving automotive, industrial, and consumer markets with ISO 9001-certified manufacturing.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated analog peripherals, and secure firmware execution - designed specifically for battery-operated and energy-harvesting IoT endpoints.

FAQ

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

The STM32L052K6U7 operates up to 32 MHz with 0.95 DMIPS/MHz performance. At 32 MHz and 3.3 V supply, typical Run mode current is 88 µA/MHz (2.82 mA total), measured with code executing from Flash and peripherals idle - verified per DS10182 Rev 10 Table 29.

Does STM32L052K6U7 support USB device operation without an external crystal?

Yes - it integrates a self-calibrating 48 MHz HSI48 oscillator synchronized to USB SOF packets, achieving ±0.25% accuracy required for Full-Speed USB 2.0 compliance. This eliminates the need for an external 48 MHz crystal or trim capacitor, confirmed in Section 3.18.5 and Table 47 of DS10182 Rev 10.

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

45 I/Os are 5V tolerant when VDD is ≥ 2.0 V, per Table 59 and Section 6.3.13. Absolute maximum pin voltage is VDD + 4 V (with VDD ≤ 3.6 V), meaning pins tolerate up to 7.6 V transiently - validated under I/O current injection tests (Table 58) and used in mixed-voltage industrial interfaces.

What is the guaranteed data retention period for the 2 KB EEPROM?

The 2 KB data EEPROM guarantees 10 years of data retention at 85 °C and 100,000 write/erase cycles, with ECC protection preventing bit errors - specified in Table 53 of DS10182 Rev 10 and qualified per JEDEC JESD22-A117 stress testing.