STMicroelectronics STM8L052R8T6

Overview

STM8L052R8T6 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, portable medical devices, and smart sensors requiring long runtime and integrated peripherals.

For engineers reviewing the STM8L052R8T6 datasheet, STM8L052R8T6 pinout, STM8L052R8T6 application, or STM8L052R8T6 equivalent, key selection criteria include its 1.8–3.6 V operating range, 5 confirmed low-power modes (including 1.4 µA Active-halt with full RTC), LQFP64 package with 54 mappable I/Os, SWIM debug interface, and integrated LCD step-up converter for direct segment driving.

Technical Context

The STM8L052R8T6 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), factory-trimmed 16 MHz HSI RC, and 38 kHz LSI RC, all managed by a clock security system to prevent run-time failure.

Power management includes five programmable BOR thresholds, POR/PDR, PVD, and dynamic current consumption of 200 µA/MHz + 330 µA. The RTC provides BCD calendar with alarm, ±0.5 ppm digital calibration, and anti-tamper detection-enabling precise timekeeping in energy-constrained systems without external components.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature grade (−40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultralow power 8-bit MCU applications.

Compared with STM8L052R8T6, STM8L152R8T6 delivers expanded analog and timing resources at higher static power, while EFM8LB1QF64E-B-QFP64 achieves deeper sleep and USB readiness but omits display and calendar features-making STM8L052R8T6 optimal for cost-sensitive, LCD-equipped metering with balanced performance.

Availability

STM8L052R8T6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply and long-term production support.

Supply support for STM8L052R8T6 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 STM8L Value Line is engineered for ultralow power embedded applications where battery longevity, integrated peripherals, and cost efficiency are critical-targeting metering, wearables, and IoT edge nodes with minimal external components.

FAQ

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

The STM8L052R8T6 operates up to 16 MHz using the internal 16 MHz HSI RC oscillator (factory-trimmed). At this frequency and VDD = 3.0 V, typical Run-mode current is 1.2 mA (measured from Flash, including core and peripheral clocks). Dynamic consumption scales as 200 µA/MHz + 330 µA, enabling predictable power budgeting across clock scaling scenarios.

Does the device support hardware-accelerated cryptography or secure boot?

No. The STM8L052R8T6 does not include hardware cryptographic accelerators, TRNG, or secure boot features. It relies on software-based encryption libraries and standard Flash write protection for basic firmware integrity. For secure element functionality, ST recommends pairing with dedicated security ICs like STSAFE-A110 or migrating to STM32L series MCUs with TrustZone or cryptographic peripherals.

Can the integrated LCD controller drive common-anode or common-cathode displays?

Yes-the STM8L052R8T6 LCD controller supports both common-anode and common-cathode configurations via software-selectable bias generation. It delivers up to 8 backplanes and 24 segments (8×24) or 4 backplanes and 28 segments (4×28), with internal step-up converter providing regulated VLCD voltage from VDD, eliminating need for external charge pump or external bias supply.

Is SWIM debugging compatible with production firmware and field updates?

Yes. SWIM (Single Wire Interface Module) operates independently of application code and remains accessible even when Flash protection is enabled-provided the debug access option byte is not disabled. Field firmware updates via USART bootloader do not interfere with SWIM functionality, enabling concurrent development, validation, and maintenance throughout product lifecycle.