STMicroelectronics STM32L041C6U6

Overview

STM32L041C6U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 32 KB Flash with ECC, 8 KB SRAM, 1 KB EEPROM with ECC, 12-bit ADC (1.14 Msps, 10 channels), and hardware AES-128 encryption engine. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and targets battery-powered IoT sensor nodes requiring long runtime and secure firmware updates.

For engineers reviewing the STM32L041C6U6 datasheet, STM32L041C6U6 pinout, STM32L041C6U6 application, or STM32L041C6U6 equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled stop mode (0.6 µA with 8 KB RAM retention), 5 µs Flash wakeup time, and 31 I/Os with 5V tolerance - critical for industrial sensor interface and energy-harvesting designs.

Technical Context

The STM32L041C6U6 integrates a Cortex-M0+ core running up to 32 MHz with dynamic voltage scaling, supported by multiple clock sources: 1–25 MHz HSE, 32 kHz LSE (RTC-calibrated), 16 MHz HSI (±1%), and multispeed MSI (65 kHz–4.2 MHz). Its low-power architecture includes five operational modes (Run, Sleep, Low-power Run, Stop, Standby), each with defined peripheral availability and current consumption profiles.

Peripheral interconnect uses a dedicated AHB/APB matrix enabling concurrent DMA transfers to ADC, SPI, I²C, USART, timers, and AES. The device supports serial wire debug (SW-DP), pre-programmed USART/SPI bootloader, and hardware-based security features including 96-bit unique ID and ECC-protected memories.

Key Specifications

Pinout & Package

STM32L041C6U6 is housed in a 28-pin UFQFPN (Ultra Thin Fine Pitch Quad Flat No-lead) package measuring 4 × 4 mm with 0.5 mm pitch. This RoHS-compliant, ECOPACK®2-qualified package supports automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051C6U6, the STM32L041C6U6 trades interface count for lower cost and identical ultra-low-power performance; versus STM32L031F6P6, it provides 4× more Flash, full EEPROM, hardware crypto, and multi-channel ADC - making it the optimal balance for secure, feature-rich, battery-constrained edge nodes.

Availability

STM32L041C6U6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial predictive maintenance, and medical wearable monitors requiring stable component supply across extended product lifecycles.

Supply support for STM32L041C6U6 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, MEMS, and automotive semiconductors.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, security, and integration for battery-operated and energy-harvesting systems in industrial, healthcare, and smart infrastructure markets.

FAQ

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

The STM32L041C6U6 achieves a maximum CPU frequency of 32 MHz. At this speed, typical current consumption is 76 µA/MHz when executing code from Flash, translating to approximately 2.43 mA total. This value assumes VDD = 3.3 V, 25 °C ambient, and active peripherals minimized per application needs.

Does STM32L041C6U6 support hardware debugging during ultra-low-power operation?

Yes - Serial Wire Debug (SW-DP) remains functional in Run, Sleep, and Low-power Run modes. However, debug access is disabled in Stop and Standby modes to preserve minimum current draw. Breakpoints and watchpoints operate normally when the core is active, enabling real-time power profiling and low-power state validation.

How is the 1 KB EEPROM implemented, and what endurance/retention does it guarantee?

The 1 KB EEPROM is integrated into the Flash memory array and protected by ECC. ST specifies 100,000 write/erase cycles and data retention of 20 years at 55 °C (or 40 years at 25 °C). It supports byte/word programming and page erasure, and is accessible via dedicated HAL drivers without blocking CPU execution.

Can the internal 32 kHz LSE oscillator be calibrated, and what accuracy is achievable?

Yes - the LSE oscillator driving the RTC can be calibrated using the RTC_CALIBR register. Calibration adjusts the oscillator's load capacitance digitally, achieving ±5 ppm accuracy after tuning. Factory-trimmed LSE typically delivers ±20 ppm initial accuracy, sufficient for metering-grade timekeeping without external TCXO.