STMicroelectronics STM32L041C6T7

Overview

STM32L041C6T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 32 KB Flash, 8 KB SRAM, 1 KB EEPROM, 12-bit ADC (1.14 Msps), and hardware AES-128 encryption. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and achieves 0.6 µA Stop mode with RTC + 8 KB RAM retention - ideal for battery-powered IoT sensor nodes requiring secure, long-life operation.

For engineers reviewing the STM32L041C6T7 datasheet, STM32L041C6T7 pinout, STM32L041C6T7 application, or STM32L041C6T7 equivalent, key selection criteria include ultra-low-power mode current (0.23 µA Standby), 32 MHz max CPU frequency, 38 fast I/Os (31 5V-tolerant), integrated AES engine, and support for ISO 7816/IRDA via USART - all critical for constrained-edge embedded designs.

Technical Context

The STM32L041C6T7 integrates a Cortex-M0+ core with 0.95 DMIPS/MHz performance and dynamic voltage scaling enabling operation down to 1.65 V. Its low-power architecture includes five power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby), each with distinct peripheral availability and current draw - e.g., Stop mode retains RTC and 8 KB RAM at 0.6 µA while supporting 16 wakeup lines.

Clock management combines multiple sources: 1–25 MHz HSE, 32 kHz LSE for RTC calibration, 16 MHz factory-trimmed HSI (±1%), 37 kHz LSI, and 65 kHz–4.2 MHz MSI - all feeding a programmable PLL for precise CPU clock derivation. The 7-channel DMA controller offloads ADC, SPI, I2C, USART, timers, and AES transfers without CPU intervention.

Key Specifications

Pinout & Package

STM32L041C6T7 is housed in a 48-pin LQFP package (7 × 7 mm, 0.5 mm pitch) compliant with ECOPACK®2 environmental standards. This package supports reflow soldering and offers mechanical stability for industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051C6T7, the STM32L041C6T7 trades Flash capacity for identical ultra-low-power performance and feature set - making it optimal for fixed-function, size-constrained deployments. Against STM32L031F6P7, it delivers significantly higher I/O count and analog channel density in the same footprint class, justifying its use in sensor-fusion edge nodes.

Availability

STM32L041C6T7 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial predictive maintenance nodes, and secure access control tokens requiring stable component supply across multi-year production cycles.

Supply support for STM32L041C6T7 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 components for industrial, automotive, and consumer markets.

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

FAQ

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

The STM32L041C6T7 runs at up to 32 MHz with typical current draw of 76 µA/MHz when executing code from Flash. At full speed (32 MHz), this equates to approximately 2.43 mA total supply current under standard conditions (3.3 V, 25 °C), verified per DS10780 Rev 6 Section 6.3.4.

Does the device support hardware debugging, and which interface is used?

Yes, the STM32L041C6T7 supports Serial Wire Debug (SW-DP) via SWDIO and SWCLK pins, enabling full JTAG-style debugging including breakpoints, watchpoints, and real-time memory inspection without dedicated JTAG header - essential for rapid firmware validation in low-power designs.

How is the 1 KB EEPROM implemented, and what endurance does it offer?

The 1 KB data EEPROM is embedded in silicon with built-in ECC and supports 100,000 write/erase cycles and 20-year data retention at 55 °C (DS10780 Rev 6 Table 47). It is accessed via dedicated HAL drivers and operates independently of Flash programming, allowing safe parameter storage during runtime.

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 RCC_BDCR register's CAL[6:0] bits, adjusting drive strength to compensate for crystal tolerance and PCB parasitics. With calibration, typical accuracy improves from ±20 ppm to ±5 ppm over –40 °C to +85 °C, as confirmed in Section 6.3.7 of the datasheet.