Item specifics
Description
STM32L031K6T6 Product Overview
STM32L031K6T6 is a Cortex-M0+ MCU at 32 MHz, LQFP-32. 32 KB Flash, 8 KB SRAM, 1 KB EEPROM, 12-bit ADC (10 ch), LP timers, RTC, 1×USART, 1×SPI, 1×I2C. Up to 27 x 5 V-tolerant I/Os. 1.8–3.6 V, -40–85 °C. Compared to the TSSOP-20 L031F6P6, the 32-pin package provides more I/Os while maintaining the same low-power and memory configuration, offering a cost-effective ultra-low-power solution for battery-powered IoT nodes and portable devices requiring richer connectivity.
STM32L031K6T6 Core Features
Core: Cortex-M0+ 32 MHz, low-power design
Memory: 32 KB Flash, 8 KB SRAM, 1 KB EEPROM
Analog: 12-bit ADC (10 ch)
Connectivity: 1×USART, 1×SPI, 1×I2C
Timers: LP Timer, GP Timers, RTC
I/Os: 27 (5 V-tolerant)
Package: LQFP-32
Temperature Range: -40°C to 85°C
STM32L031K6T6 Applications
IoT Sensor Nodes: Battery-powered environmental sensors, wireless modules
Portable Devices: Wearables, portable medical devices
Industrial Metering: Water, gas, and electricity meters
Consumer Electronics: Remote controls, e-labels, smart cards
Low-Power Systems Needing More I/Os: Miniaturized controllers, energy harvesting nodes
STM32L031K6T6 Key Advantages
Ultra-Low Power: Multiple low-power modes extend battery life
1 KB EEPROM: Eliminates external storage for data logging
32-bit Performance, 8-bit Price: Enjoy the ARM ecosystem at a very low cost
27 I/Os + LQFP-32 Package: Balance of compact size and rich pins for miniaturized systems
5 V-tolerant I/Os: Enhanced robustness, simplified level shifting
Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries
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FAQ
1. What is STM32L031K6T6 and what are its core features?
STM32L031K6T6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L0 series, built around an Arm® Cortex®‑M0+ core in an LQFP‑32 package (7 mm × 7 mm). Operating at 32 MHz, it provides 32 KB Flash and 8 KB SRAM, and integrates a 12‑bit ADC and a low‑power UART. This chip offers a very hand‑solderable package option, delivering complete processing capability for simple battery‑powered devices that demand long battery life, minimal cost, and small PCB area without requiring complex peripherals.
2. What are the key specifications of STM32L031K6T6?
Core: Arm® Cortex®‑M0+, up to 32 MHz
Memory: 32 KB Flash, 8 KB SRAM
Operating Voltage: 1.65 V to 3.6 V
Temperature Range: -40 °C to +85 °C (industrial grade)
I/O Count: up to 25
Package: LQFP‑32 (7 mm × 7 mm)
3. Is the LQFP‑32 package easy to solder? What are its advantages over the QFN version (K6U6)?
Very easy. The LQFP‑32 has all pins exposed with a generous 0.8 mm pitch, allowing drag‑soldering with a standard iron and flux—no hot‑air station required. Compared to the QFN variant (STM32L031K6U6), the LQFP package offers significant advantages in hand soldering, visual inspection, and rework, making it an excellent choice for hobbyists, students, and small teams for prototyping and small‑batch production. The 7 mm × 7 mm size also balances compactness with easy manual handling.
4. Why choose STM32L031 over STM32L051? What are the main differences?
The STM32L031 is a more streamlined member of the L0 family. Compared to the L051, it reduces the number of SPI and I²C interfaces to one each and omits capacitive touch sensing (TSC). This optimization delivers the same ultra‑low‑power core and analog acquisition at an even more attractive cost. If your application needs only a few communication interfaces and no touch keys, the L031 offers a higher cost‑performance ratio.
5. What applications can the 32 KB Flash and 8 KB SRAM combination support? Is it enough?
32 KB Flash can hold a compact bare‑metal program or a lightweight RTOS kernel, along with common sensor drivers and wireless communication stacks. 8 KB SRAM requires careful variable management, but is perfectly adequate for fixed‑function applications such as wireless sensor nodes, environmental monitors, and battery monitors. If more code space is needed, upgrade to a 64 KB variant like the STM32L051K8T6.
6. How does it perform in terms of low power consumption? What are the typical currents across its modes?
Temperature Range: -40 °C to +85 °C
Ultra‑low‑power modes:
Standby mode: ~0.27 µA (no RTC)
Stop mode: ~0.4 µA (no RTC), ~0.8 µA with RTC
Run mode: ~88 µA/MHz
7. How capable is the built‑in 12‑bit ADC? Can it meet typical sensor acquisition needs?
The ADC supports up to 16 external input channels, a maximum sampling rate of 1.14 Msps, 12‑bit resolution, and a built‑in window comparator. It is fully sufficient for common signals such as temperature, pressure, light, and battery voltage. It can also remain active in low‑power modes and wake the CPU via the analog watchdog, making it ideal for battery‑powered devices that periodically monitor analog signals.
8. What communication interfaces are integrated? Is there a low‑power UART?
The STM32L031K6T6 includes 1× SPI, 1× I²C, and 1× low‑power UART (LPUART). The LPUART can remain operational in Stop mode and wake the MCU upon address match or start bit detection, significantly reducing system standby power. This is particularly useful for applications that communicate with wireless modules or sensors over a serial link.
9. What development tools are needed for the STM32L031K6T6? Is there a suitable evaluation board?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment, along with the STM32CubeL0 firmware library. Debugging and programming are handled by ST‑Link debuggers. For rapid prototyping, the NUCLEO‑L031K6 board features the same L031 chip in a 32‑pin package with identical pinout and functionality, allowing direct code migration to the target board.
10. If I later need more storage or richer peripherals, what upgrade options are available?
If more Flash or SRAM is needed, you can upgrade to a 64 KB variant in the same package (e.g., STM32L051K8T6) or to the LQFP‑48 STM32L051C8T6. If a segment LCD driver or USB is required, step up to the L052 or L053 series respectively. In all these upgrade paths, core code is reusable—only pin configuration and peripheral parameters need adjustment in STM32CubeMX.