STMicroelectronics STM32L053R8H6

Overview

STM32L053R8H6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 64 KB Flash, 8 KB SRAM, 2 KB EEPROM, integrated LCD driver, USB 2.0 (crystal-less), and 12-bit ADC/DAC - deployed in battery-powered smart meters, portable medical sensors, and industrial IoT edge nodes requiring sub-1 µA Stop mode operation.

For engineers reviewing the STM32L053R8H6 datasheet, STM32L053R8H6 pinout, STM32L053R8H6 application, or STM32L053R8H6 equivalent, key selection criteria include verified 0.4 µA Stop mode current, 32 MHz max CPU frequency, 45 5V-tolerant I/Os, and hardware-accelerated capacitive touch sensing up to 24 channels.

Technical Context

This MCU implements a dual-voltage domain architecture with dynamic voltage scaling (DVS) enabling three operating ranges (1.8–3.6 V, 1.65–3.6 V, and 1.65–3.3 V), directly supporting low-power sensor acquisition and real-time processing without external regulators. Its clock system integrates five independent oscillators - including factory-trimmed 16 MHz HSI, 32 kHz LSE for RTC, and 48 MHz HSI48 for USB - all managed by a programmable clock recovery system (CRS) for crystal-less USB timing compliance.

The peripheral interconnect matrix routes DMA, timers, ADC, DAC, and communication interfaces (USB, 3× USART/LPUART, 4× SPI, 2× I2C) without CPU intervention, while the ultra-low-power comparators and 16-bit LPTIM enable wake-up from Standby using analog thresholds or periodic events - critical for energy-harvesting applications.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant ECOPACK2, with 51 fast I/Os (45 5V-tolerant), dedicated LCD segment/common pins, and separate V_DDA/V_SSA for analog noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073RZT6 and STM32L432KCU6, the STM32L053R8H6 uniquely balances ultra-low static power, integrated LCD, and capacitive touch - making it optimal for cost-sensitive, battery-limited HMI applications where cryptographic or floating-point performance is secondary.

Availability

STM32L053R8H6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle assurance, and full traceability from wafer to shipment.

Supply support for STM32L053R8H6 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 sub-1 µA standby current, integrated peripherals, and extended battery life - with design focus on smart meters, wearables, and energy-harvesting systems.

FAQ

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

The STM32L053R8H6 operates up to 32 MHz with 88 µA/MHz typical current consumption when executing code from Flash. At 32 MHz, this yields ~2.8 mA total active current - verified per DS10152 Rev 10 Table 28, measured with V_DD = 3.3 V, 25 °C, and all peripherals disabled except core and SysTick.

Does the device support hardware encryption or secure boot features?

No. The STM32L053R8H6 lacks dedicated cryptographic accelerators (AES, SHA, PKA) and does not support hardware root-of-trust or secure boot. It includes a true RNG and firewall protection for basic entropy and memory access control, but secure firmware validation requires external co-processors or software-only implementations.

Can the integrated LCD driver operate without external components?

Yes. The LCD controller supports internal step-up converter and contrast adjustment, driving up to 8×28 segments directly. No external bias resistor network or charge pump IC is required - confirmed in Section 3.11 of DS10152 Rev 10, with V_LCD generated internally from V_DD.

What are the wake-up sources available from Standby mode?

From Standby mode, wake-up is supported by two dedicated pins (PA0 and PC13), RTC alarm, RTC wake-up timer, and external reset. This is documented in Section 3.1 and Table 4 of DS10152 Rev 10, with 0.27 µA typical current draw and 5 µs wake-up latency from flash memory.