STMicroelectronics STM32L031C6T7

Overview

STM32L031C6T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 48-pin UFQFPN 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 V to 3.6 V across –40 °C to +125 °C and targets battery-powered sensor nodes and smart metering endpoints requiring sub-µA standby current (0.23 µA) and fast 5 µs wake-up from Flash.

For engineers reviewing the STM32L031C6T7 datasheet, STM32L031C6T7 pinout, STM32L031C6T7 application, or STM32L031C6T7 equivalent, key selection criteria include verified low-power mode current consumption (0.35 µA Stop, 0.6 µA Stop+RTC+8KB RAM retention), 31 I/Os with 5V tolerance, integrated 32 kHz RTC oscillator with calibration, and support for SW-DP debug interface.

Technical Context

The STM32L031C6T7 implements dynamic voltage scaling and multiple low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby) with configurable wakeup sources including 16 EXTI lines and 2 dedicated wakeup pins. Its clock system integrates factory-trimmed 16 MHz HSI (±1%), 37 kHz LSI, 65 kHz–4.2 MHz MSI, 32 kHz LSE for RTC, and PLL for CPU clock multiplication.

It features an interconnect matrix enabling concurrent peripheral operation without bus contention, supports serial wire debug (SW-DP), and includes hardware ECC on Flash and EEPROM. The 12-bit ADC delivers 1.14 Msps with up to 10 channels and operates down to 1.65 V supply, while two comparators provide window mode detection and wakeup capability at same voltage range.

Key Specifications

Pinout & Package

STM32L031C6T7 is housed in a 48-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 7 mm × 7 mm with 0.5 mm pitch. This RoHS-compliant, ECOPACK®2-qualified package supports automated optical inspection and offers excellent thermal performance for space-constrained industrial and portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4T6, the STM32L031C6T7 adds 1 KB EEPROM for field-configurable parameters and doubles Flash capacity for complex sensor fusion algorithms; versus STM32L051K8U6, it trades USB for lower static power and smaller UFQFPN48 footprint-ideal for sealed, battery-only deployments.

Availability

STM32L031C6T7 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, medical wearable patches, and asset tracking beacons requiring stable component supply, long-term lifecycle assurance, and guaranteed traceability.

Supply support for STM32L031C6T7 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 since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, operating across extended temperature ranges and supporting secure firmware updates - optimized for IoT edge nodes and energy-harvesting systems.

FAQ

What is the maximum operating frequency of the STM32L031C6T7?

The STM32L031C6T7 achieves a maximum CPU clock frequency of 32 MHz, enabled by its Arm Cortex-M0+ core and supported by the internal 16 MHz HSI oscillator (±1% factory trim) or external crystal up to 25 MHz. Dynamic voltage scaling allows this frequency across the full 1.65–3.6 V supply range, delivering 0.95 DMIPS/MHz performance without thermal throttling.

Does the STM32L031C6T7 support hardware encryption or secure boot?

The STM32L031C6T7 does not integrate dedicated cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. However, it supports software-based encryption libraries and includes a 96-bit unique ID plus hardware CRC unit for firmware image integrity verification. Secure boot implementation requires external trusted execution environment or companion secure element.

Can the STM32L031C6T7 drive 5 V logic directly?

Yes - 31 GPIOs on the STM32L031C6T7 are explicitly rated as 5V tolerant (VDD + 4 V absolute max), allowing direct interface with 5 V peripherals such as legacy sensors, displays, or level-shifter-free UART transceivers. This eliminates external voltage translators in mixed-voltage systems, reducing PCB area and BOM cost.

What debug interface does the STM32L031C6T7 use?

The STM32L031C6T7 uses Serial Wire Debug (SW-DP), a 2-pin ARM-standard interface (SWDIO and SWCLK) that supports full JTAG-equivalent functionality - including halt/resume, register read/write, memory access, and flash programming - with lower pin count and reduced signal integrity constraints than traditional JTAG.