STMicroelectronics STM32L052R8T7

Overview

STM32L052R8T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 64 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, USB 2.0 (crystal-less), and a 12-bit ADC (1.14 Msps, 16 channels). It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and delivers 0.8 µA Stop mode + RTC + 8-KB RAM retention - ideal for battery-powered IoT sensor nodes and portable medical devices.

For engineers reviewing the STM32L052R8T7 datasheet, STM32L052R8T7 pinout, STM32L052R8T7 application, or STM32L052R8T7 equivalent, key selection criteria include ultra-low-power mode timing (3.5 µs wakeup from RAM), integrated USB crystal-less PHY with battery charging detection, ECC-protected memory architecture, and capacitive touch sensing support for human-interface designs.

Technical Context

The STM32L052R8T7 integrates an Arm Cortex-M0+ core with MPU, running at up to 32 MHz, supported by multiple clock sources: HSI16 (±1%), HSI48 (self-calibrated for USB), LSE (32 kHz RTC), and MSI (65 kHz–4.2 MHz). Its interconnect matrix enables concurrent peripheral access without CPU arbitration overhead.

Low-power operation is enforced via five distinct modes: Run (88 µA/MHz), Sleep, Low-power Run/Sleep, Stop (0.4 µA), and Standby (0.27 µA). Each mode preserves specific memory blocks and peripherals - e.g., Stop mode retains RTC, 8 KB RAM, and 2 KB EEPROM while disabling CPU and flash.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK2 certified. Pin count: 48 leads, with 45 I/Os (45 5V-tolerant), VDD/VSS pairs distributed for noise immunity, and dedicated USB D+/D− pins routed for ESD-safe layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L052R8T7, the STM32L072RBT6 trades USB for security extensions and memory headroom, while the STM32L432KCU6 upgrades core performance at the cost of 3× higher active power - making the R8T7 optimal for USB-connected, battery-limited endpoints where deterministic low-power behavior is non-negotiable.

Availability

STM32L052R8T7 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and industrial control panels requiring stable component supply and long-term manufacturability.

Supply support for STM32L052R8T7 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 products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, robust memory integrity, and integrated analog peripherals - specifically engineered for IoT edge nodes and portable electronics where energy efficiency defines system viability.

FAQ

What is the maximum operating frequency and core type of the STM32L052R8T7?

The STM32L052R8T7 features an Arm Cortex-M0+ core rated for up to 32 MHz operation. Its 0.95 DMIPS/MHz performance metric reflects deterministic instruction execution without pipeline stalls, optimized for low-latency interrupt response in sensor-fusion and real-time control tasks.

Does the STM32L052R8T7 support USB without an external crystal?

Yes - it integrates a self-calibrating 48 MHz HSI48 RC oscillator synchronized to USB Start-of-Frame (SOF) packets, enabling full-speed USB 2.0 communication without an external crystal or trimming capacitor. This reduces BOM cost and PCB area while maintaining ±0.25% timing accuracy.

How much EEPROM is available, and what protection does it offer?

The device includes 2 KB of data EEPROM with built-in ECC (error-correcting code), supporting 100,000 write/erase cycles and 40-year data retention at 85 °C. ECC automatically detects and corrects single-bit errors, ensuring reliability in mission-critical logging and calibration storage.

What are the lowest power consumption modes and their typical currents?

In Standby mode with two wakeup pins enabled, current draw is 0.27 µA; in Stop mode with 16 wakeup lines active, it is 0.4 µA; and in Stop mode with RTC and 8 KB RAM retention, it is 0.8 µA. All values are measured at 25 °C with VDD = 3.3 V and include internal regulator leakage.