STMicroelectronics STM32L052R8T6

Overview

STM32L052R8T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 64 KB Flash, 8 KB SRAM, 2 KB EEPROM, integrated USB 2.0 (crystal-less), 12-bit ADC (1.14 Msps), and 12-bit DAC. It operates from 1.65–3.6 V across –40 to +125 °C and delivers 0.8 µA Stop mode + RTC + 8-KB RAM retention-enabling battery-powered IoT sensor nodes with local signal conditioning and USB firmware updates.

For engineers reviewing the STM32L052R8T6 datasheet, STM32L052R8T6 pinout, STM32L052R8T6 application, or STM32L052R8T6 equivalent, key selection criteria include ultra-low-power runtime (88 µA/MHz), crystal-less USB timing tolerance (±1% HSI48 self-calibration), 45 5V-tolerant I/Os, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L052R8T6 integrates a Cortex-M0+ core with MPU, supporting dynamic voltage scaling and multiple low-power modes including Stop (0.4 µA), Standby (0.27 µA), and ultra-low-power Run (88 µA/MHz). Its clock system combines factory-trimmed 16 MHz HSI (±1%), self-calibrating 48 MHz HSI48 for USB, 32 kHz LSE for RTC, and PLL for CPU frequency up to 32 MHz.

Analog subsystem includes a 12-bit ADC with up to 16 channels (1.14 Msps, functional down to 1.65 V), a buffered 12-bit DAC (down to 1.8 V), two ultra-low-power comparators with window mode and wake-up, and a temperature sensor with factory calibration. The device supports capacitive touch sensing on up to 24 channels.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L052R8T6, STM32L072RBT6 offers headroom for complex firmware while maintaining identical low-power behavior and pin compatibility, whereas STM32L011K4T6 trades peripherals and memory for reduced size and cost-making it suitable only for stripped-down sensing tasks.

Availability

STM32L052R8T6 is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial sensor nodes, and asset tracking tags requiring stable component supply across extended product lifecycles.

Supply support for STM32L052R8T6 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 analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust security, and rich analog integration-designed specifically for IoT edge nodes, wearables, and smart meters.

FAQ

What is the maximum operating frequency of the STM32L052R8T6?

The STM32L052R8T6 achieves a maximum CPU frequency of 32 MHz, enabled by its Arm Cortex-M0+ core and internal PLL. This frequency is attainable across the full 1.65–3.6 V supply range and –40 to +125 °C temperature range, with dynamic voltage scaling ensuring stable operation under varying load conditions.

Does the STM32L052R8T6 support USB without an external crystal?

Yes-the device integrates a self-calibrating 48 MHz HSI48 RC oscillator that meets USB full-speed timing specifications (±0.25% after calibration), eliminating the need for an external crystal. USB D+/D− pins (PD0/PD1) and VBUS detection (PD2) are fully supported in the LQFP64 package.

How many I/O pins are 5V tolerant on the STM32L052R8T6?

45 of the 51 I/O pins on the STM32L052R8T6 are 5V tolerant, including all pins in ports A, B, C, and D except for specific analog/dedicated functions (e.g., VREF+, VREF−, USB pins). This allows direct interfacing with 5V logic peripherals without external level-shifting circuitry.

What is the endurance rating of the embedded EEPROM?

The 2 KB embedded EEPROM is rated for 100,000 write/erase cycles and guarantees data retention for 20 years at 85 °C. It includes built-in ECC for single-bit error correction and double-bit error detection, ensuring reliability in mission-critical parameter storage applications.