STMicroelectronics STM8L052R8T6TR

Overview

STM8L052R8T6TR from STMicroelectronics is an 8-bit ultralow power microcontroller featuring 64 KB Flash, 256-byte data EEPROM with ECC, RTC, LCD controller (8×24/4×28), 12-bit ADC (1 Msps, 27 channels), three USARTs, two SPIs, I²C, and advanced low-power modes down to 400 nA in Halt. It targets battery-powered metering, wearable sensors, and smart industrial nodes requiring long runtime and integrated display.

For engineers reviewing the STM8L052R8T6TR datasheet, STM8L052R8T6TR pinout, STM8L052R8T6TR application, or STM8L052R8T6TR equivalent, key selection criteria include sub-µA active-halt current with full RTC operation, factory-trimmed 16 MHz RC oscillator ±1%, LCD step-up converter integration, and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L052R8T6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual crystal oscillators (32 kHz LSE + 1–16 MHz HSE), internal 16 MHz HSI (±1% over voltage/temperature), and 38 kHz LSI for ultra-low-power RTC and wake-up timing.

Power management includes five configurable low-power modes-Wait, Low Power Run (5.9 µA), Low Power Wait (3 µA), Active-Halt with full RTC (1.4 µA), and Halt (400 nA)-with fast 4.7 µs wakeup from Halt and per-pin leakage as low as 50 nA. The embedded reset block features 5-programmable BOR thresholds and PVD for supply monitoring.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with 54 user-configurable I/Os, all mappable to interrupt vectors. Pin functions include dedicated LCD segment/common drivers, multiple USART/SPI/I²C alternate functions, and hardware reset (NRST) with programmable pull-up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152R8T6, the STM8L052R8T6TR omits crypto acceleration but delivers identical low-power performance and LCD capability at lower cost; versus EFM32HG322F64G, it provides integrated display support and simpler toolchain adoption for 8-bit legacy designs.

Availability

STM8L052R8T6TR is available at Aetrix Electronics and suitable for smart metering, wearable health devices, industrial sensor nodes, and asset tracking beacons requiring stable component supply and long-term production continuity.

Supply support for STM8L052R8T6TR 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 automotive semiconductors.

The STM8L Value Line is engineered for ultralow-power embedded applications demanding extended battery life, integrated peripherals (LCD, RTC, ADC), and robust industrial-grade reliability across harsh environments.

FAQ

What is the maximum operating frequency and core architecture of the STM8L052R8T6TR?

The STM8L052R8T6TR uses an 8-bit STM8 Harvard-architecture core with a 3-stage pipeline, achieving a maximum CPU frequency of 16 MHz and a peak performance of 16 CISC MIPS. It operates across the full 1.8 V to 3.6 V supply range and supports both external crystals (1–16 MHz HSE) and an internal factory-trimmed 16 MHz RC oscillator with ±1% accuracy over voltage and temperature.

Does the STM8L052R8T6TR support hardware-based real-time clock with calendar functionality?

Yes, the device integrates a low-power RTC with BCD calendar, alarm interrupt, digital calibration (±0.5 ppm accuracy), and advanced anti-tamper detection. It operates autonomously in Active-Halt mode (1.4 µA) using the 32.768 kHz LSE crystal, retaining timekeeping while most peripherals and CPU are powered down.

How many I/O pins does the STM8L052R8T6TR provide, and what peripheral functions can they support?

The LQFP64 package offers up to 54 user-configurable I/Os, all mappable to external interrupt vectors. These pins support multiple alternate functions including USART, SPI, I²C, ADC inputs, LCD segment/common outputs, timer capture/compare, and PWM generation-all configurable via the SYSCFG register without requiring dedicated pin assignments.

Is SWIM debugging supported, and what are its practical advantages in development?

Yes, the STM8L052R8T6TR supports Single-Wire Interface Module (SWIM) for non-intrusive on-chip programming and debugging using only the NRST pin. This eliminates the need for dedicated debug headers, preserves all I/O resources for application use, and enables in-system firmware updates-even after PCB assembly-without requiring JTAG/SWD connectors or additional routing.