STMicroelectronics STM32L053R8T6TR

Overview

STM32L053R8T6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP64 package, featuring 64 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, integrated LCD driver (8×28 segments), USB 2.0 crystal-less interface, and 12-bit ADC (1.14 Msps, 16 channels). It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered metering and portable medical devices.

For engineers reviewing the STM32L053R8T6TR datasheet, STM32L053R8T6TR pinout, STM32L053R8T6TR application, or STM32L053R8T6TR equivalent, key selection criteria include standby current (0.27 µA), wake-up time (3.5 µs from RAM), USB crystal-less operation, LCD segment drive capability, and dual ultra-low-power comparators with window mode.

Technical Context

The device implements a tightly coupled Cortex-M0+ core with MPU, supporting dynamic voltage scaling and clock gating for multi-level power optimization. Its low-power architecture integrates dedicated peripherals-including LPTIM, RTC with 8-KB RAM retention, and hardware CRC-enabling deterministic real-time response in energy-constrained environments.

Memory subsystem includes ECC-protected Flash and EEPROM, 20-byte backup registers, and sector write protection. Analog integration comprises a 12-bit ADC (down to 1.65 V), single-channel 12-bit DAC (down to 1.8 V), two comparators (with wake-up and window mode), and on-chip temperature sensor with factory calibration.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L053R8T6TR, STM32L073RZT6 trades LCD capability for enhanced security and memory, while STM32L152RCT6 offers higher CPU throughput at the cost of USB and display integration-making the R8T6 optimal for compact, self-contained display-and-USB endpoints.

Availability

STM32L053R8T6TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L053R8T6TR 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-µA standby, rapid wake-up, and rich analog integration-optimized for battery-operated endpoints where energy efficiency and peripheral consolidation are critical.

FAQ

What is the maximum operating frequency and core type of the STM32L053R8T6TR?

The STM32L053R8T6TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS per MHz. Its maximum frequency is constrained by supply voltage and dynamic voltage scaling settings-achieving full 32 MHz only above 2.4 V, with reduced clock rates (e.g., 16 MHz) supported down to 1.65 V to maintain stability and ultra-low power consumption.

Does the STM32L053R8T6TR support USB without an external crystal?

Yes. The device integrates a factory-trimmed 48 MHz HSI48 RC oscillator with Clock Recovery System (CRS) that synchronizes to the USB SOF packet, enabling crystal-less USB 2.0 Full-Speed operation. This eliminates the need for an external 48 MHz crystal, reducing BOM count and PCB area while maintaining ±0.25% timing accuracy required for USB compliance.

How many I/O pins are 5V-tolerant, and what is their functional scope?

45 of the 51 general-purpose I/Os are 5V-tolerant, covering all pins except those dedicated to USB (DP/DM), oscillator inputs (HSE/LSE), and certain analog inputs (e.g., VREF+, VREF–). These 5V-tolerant pins support all alternate functions-including USART, SPI, I2C, timers, and ADC inputs-allowing direct interfacing with legacy 5V logic without level shifters in mixed-voltage systems.

What LCD capabilities does the STM32L053R8T6TR provide, and how is contrast controlled?

The device integrates an LCD controller supporting up to 8 commons and 28 segments (224 segments total), with on-chip step-up converter generating VLCD (2.4–3.6 V) from VDD. Contrast is adjusted digitally via 32-step software-controlled voltage divider, and blinking mode is managed by hardware timer-eliminating external potentiometers or PWM circuits for display tuning.