STMicroelectronics STM32L031C6U6

Overview

STM32L031C6U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 32 KB Flash, 8 KB SRAM, 1 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C and delivers 76 µA/MHz in Run mode - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031C6U6 datasheet, STM32L031C6U6 pinout, STM32L031C6U6 application, or STM32L031C6U6 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 energy-constrained industrial and IoT edge devices.

Technical Context

The STM32L031C6U6 integrates a Cortex-M0+ core running up to 32 MHz with dynamic voltage scaling, supported by multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU clock multiplication. Its low-power architecture includes five operational modes - Run, Sleep, Low-power Run, Stop, and Standby - each with distinct peripheral enablement and retention policies.

Memory subsystem includes ECC-protected Flash and EEPROM, 20-byte backup registers, and sector write protection. Analog peripherals are fully functional down to 1.65 V: 12-bit ADC supports up to 10 channels at 10 ksps (41 µA), while two comparators offer window mode detection and wake-up capability with internal reference.

Key Specifications

Pinout & Package

STM32L031C6U6 is housed in a 28-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN28) package measuring 4 × 4 mm with 0.5 mm pitch. The package is ECOPACK®2-compliant and supports reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4T6, the STM32L031C6U6 adds EEPROM and higher Flash density without increasing package size; versus STM32L051C8T6, it trades 32 KB Flash and lower active current for reduced code capacity - optimizing for minimal energy-per-operation in simple edge nodes.

Availability

STM32L031C6U6 is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical diagnostics, and asset tracking applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for STM32L031C6U6 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 analog components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated analog peripherals, and robust security features - specifically engineered for battery-operated and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core type of the STM32L031C6U6?

The STM32L031C6U6 features an Arm Cortex-M0+ core with a maximum CPU frequency of 32 MHz. It achieves 0.95 DMIPS/MHz performance and supports dynamic voltage scaling to optimize power versus speed. The core is factory-trimmed for 16 MHz HSI accuracy (±1%) and can be boosted via PLL for higher throughput tasks.

Does the STM32L031C6U6 support hardware error correction for memory?

Yes, the STM32L031C6U6 implements hardware ECC on both its 32 KB Flash and 1 KB EEPROM. This detects and corrects single-bit errors and detects double-bit errors without software overhead, ensuring data integrity in mission-critical applications such as utility metering and medical logging where uncorrected memory faults could compromise safety or compliance.

How many analog inputs does the 12-bit ADC support, and what is its minimum supply voltage for operation?

The integrated 12-bit ADC supports up to 10 input channels and operates down to 1.65 V supply voltage. At 10 ksps, it consumes only 41 µA and delivers 1.14 Msps maximum sampling rate. Input channels include dedicated pins (e.g., PA0–PA7) and internal signals like temperature sensor and VREFINT, enabling self-calibration and environmental monitoring.

Can the STM32L031C6U6 wake up from Stop mode using analog comparators?

Yes, both ultra-low-power comparators (COMP1 and COMP2) can generate wake-up events from Stop mode. Each comparator supports window mode and independent output assertion, with internal voltage reference and programmable hysteresis. Wake-up occurs in under 5 µs, and comparator inputs remain active at 1.65 V - enabling rapid response to analog threshold breaches without CPU intervention.