STMicroelectronics STM32L031C6T7D

Overview

STM32L031C6T7D 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 meters requiring sub-µA standby current (0.23 µA) and fast 5 µs wakeup.

For engineers reviewing the STM32L031C6T7D datasheet, STM32L031C6T7D pinout, STM32L031C6T7D application, or STM32L031C6T7D equivalent, key selection criteria include verified low-power mode timing (Stop mode @ 0.35 µA), 31 I/Os with 5V tolerance, integrated RTC with 8 KB RAM retention, and bootloader support for USART/SPI - all confirmed in DS10668 Rev 6.

Technical Context

The STM32L031C6T7D implements a single-core Arm Cortex-M0+ running at up to 32 MHz with 0.95 DMIPS/MHz performance and dynamic voltage scaling. Its power architecture includes five selectable brownout reset (BOR) thresholds, programmable voltage detector (PVD), and three internal RC oscillators (16 MHz HSI, 37 kHz LSI, 65 kHz–4.2 MHz MSI) plus external crystal support (1–25 MHz).

Peripherals are managed via an interconnect matrix enabling concurrent DMA transfers across ADC, SPI, I²C, USART, and timers. The device integrates a 7-channel DMA controller, eight timers (including ultra-low-power LPTIM and RTC), two watchdogs (independent/window), and hardware CRC - all operating within the same ultra-low-power domain without external assistance.

Key Specifications

Pinout & Package

STM32L031C6T7D is housed in a 48-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 7 mm × 7 mm with 0.5 mm pitch, compliant with ECOPACK®2 environmental standards and optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031C6T7D, STM32L011K4T6 sacrifices EEPROM and half the memory for lower cost and smaller footprint, while STM32L053R8T6 adds USB and double Flash at the expense of higher static current and package size - making the C6T7D optimal for balanced ultra-low-power embedded control with integrated nonvolatile data storage.

Availability

STM32L031C6T7D 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, long-term lifecycle assurance, and consistent parametric performance across temperature and voltage ranges.

Supply support for STM32L031C6T7D 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 devices for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, robust data integrity, and seamless integration of analog/mixed-signal peripherals - with the L031 variant optimized for cost-sensitive, space-constrained designs requiring ECC-protected memory and sub-µA power states.

FAQ

What is the maximum operating frequency and core type of the STM32L031C6T7D?

The STM32L031C6T7D features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz performance. Its maximum frequency is constrained by supply voltage and dynamic voltage scaling settings - at 3.3 V it achieves full 32 MHz, while at 1.8 V the maximum is reduced to 16 MHz per DS10668 Table 4. The core includes a single-cycle multiplier and hardware divide, supporting deterministic real-time execution.

Does the STM32L031C6T7D support 5V-tolerant I/Os, and how many are there?

Yes, the STM32L031C6T7D supports 5V-tolerant I/Os on 31 pins (PA0–PA15, PB0–PB15, PC13–PC15), as confirmed in DS10668 section 3.7 and Table 15. This tolerance applies when VDD is powered (1.65–3.6 V) and allows direct interfacing with 5V logic without external level shifters - critical for legacy system integration and mixed-voltage sensor interfaces.

What are the lowest achievable current consumption values in Stop and Standby modes?

In Stop mode with RTC and 8 KB RAM retention enabled, the STM32L031C6T7D draws 0.6 µA (typical) at 3.0 V and 25 °C (DS10668 Table 31). In Standby mode with two wakeup pins active, it consumes 0.23 µA (typical) under the same conditions (Table 32). These values assume proper configuration of power control registers, disabled unused peripherals, and use of internal regulators - verified across –40 °C to +85 °C per operating conditions table.

Is there factory-programmed bootloader support, and which interfaces does it use?

Yes, the STM32L031C6T7D includes a factory-programmed system memory bootloader accessible via BOOT0 pin assertion. It supports firmware updates over USART (using internal 16 MHz HSI clock) and SPI (with external clock), as documented in DS10668 section 3.4.4 and AN2606. No external programmer is needed for field upgrades, and the bootloader occupies protected system memory - leaving full 32 KB Flash available for user application code.