STMicroelectronics STM32L053C6U6

Overview

STM32L053C6U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN48 package, featuring 32 MHz max CPU frequency, 32 KB Flash, 8 KB SRAM, and integrated LCD driver with on-board step-up converter. It delivers 0.8 µA Stop mode + RTC + RAM retention, 12-bit 1.14 Msps ADC (16 channels), and crystal-less USB 2.0 - deployed in battery-powered smart meters and portable medical sensors.

For engineers reviewing the STM32L053C6U6 datasheet, STM32L053C6U6 pinout, STM32L053C6U6 application, or STM32L053C6U6 equivalent, key selection criteria include ultra-low-power mode timing (3.5 µs wake-up from RAM), 5V-tolerant I/O count (45 pins), EEPROM endurance (100k cycles), and LCD segment drive capability (8×28).

Technical Context

The STM32L053C6U6 implements a dual-voltage domain architecture with separate VDD/VSS and VLCD rails, enabling independent LCD bias control and low-power analog operation down to 1.65 V. Its clock system integrates five oscillators - including HSI48 for USB timing and LSE for RTC calibration - managed via programmable prescalers and PLL multiplication.

Power management includes three distinct low-power modes (Stop, Standby, Low-power Run) with configurable wake-up sources: 16 external lines, 2 ultra-low-power comparators with window mode, and capacitive sensing inputs supporting touchkey detection. The embedded 2 KB EEPROM uses ECC for data integrity across 100k write/erase cycles.

Key Specifications

Pinout & Package

STM32L053C6U6 is housed in a 7×7 mm UFQFPN48 package with 0.5 mm pitch and exposed thermal pad. Pin functions are validated per STMicroelectronics DS10152 Rev 10, Section 4 "Pin descriptions".

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L053R6T6, the C6U6 offers smaller footprint and integrated LCD biasing but fewer GPIOs; versus STM32L073RZT6, it trades crypto/AES and memory headroom for lower cost and identical ultra-low-power performance in basic sensing roles.

Availability

STM32L053C6U6 is available at Aetrix Electronics and suitable for smart utility meters, portable medical sensors, industrial wireless nodes, and low-power HVAC thermostats requiring stable component supply across long product lifecycles.

Supply support for STM32L053C6U6 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 ICs, sensors, and automotive-grade components.

The STM32L0 series targets ultra-low-power embedded applications - optimized for battery-operated devices requiring multi-year runtime, integrated peripherals (LCD, USB, capacitive sensing), and robust security features.

FAQ

What is the maximum operating frequency and core type of the STM32L053C6U6?

The STM32L053C6U6 features an Arm Cortex-M0+ core rated for up to 32 MHz operation. It includes a Memory Protection Unit (MPU) and achieves 0.95 DMIPS/MHz. The core supports Thumb-2 instruction set and operates across the full 1.65–3.6 V supply range, with dynamic voltage scaling enabling optimal power/performance trade-offs in different operating modes.

Does the STM32L053C6U6 support crystal-less USB operation?

Yes, the STM32L053C6U6 integrates a factory-trimmed 48 MHz HSI48 oscillator with Clock Recovery System (CRS) for crystal-less USB 2.0 Full-Speed operation. This eliminates the need for an external 48 MHz crystal or oscillator, reducing BOM cost and PCB area while maintaining ±1.5% timing accuracy required for USB compliance.

How many I/O pins are 5V tolerant, and what is the package type?

The STM32L053C6U6 provides 45 5V-tolerant I/O pins in a 7×7 mm UFQFPN48 package with 0.5 mm pitch and exposed thermal pad. This package supports reflow soldering and offers superior thermal performance compared to LQFP variants, making it ideal for compact, thermally constrained designs such as wearable sensors and handheld instruments.

What LCD capabilities does the STM32L053C6U6 offer?

The STM32L053C6U6 integrates a dedicated LCD controller supporting up to 8 commons × 28 segments. It includes an on-chip step-up converter generating VLCD up to 3.5 V, eliminating external bias circuitry. Contrast adjustment, blinking mode, and software-controlled COM/SEG polarity inversion are supported - enabling direct drive of segment-based displays in smart meters and portable diagnostics tools.