Item specifics
Description
The STM32C031K6T6 is a mainstream Arm Cortex-M0+ 32-bit MCU from STMicroelectronics, based on a high-performance 32-bit Arm Cortex-M0+ RISC core operating up to 48 MHz with a built-in Memory Protection Unit (MPU). It integrates 32 KB Flash with protection, 12 KB SRAM with hardware parity check, and CRC calculation unit. On-chip peripherals include a 12-bit ADC (2.5 MSps, up to 18 channels), 3-channel DMA controller, low-power RTC with alarm, up to 8 timers (including one 16-bit advanced motor control PWM timer, four 16-bit general-purpose timers, two watchdogs, and SysTick timer), and I2C (Fast-mode Plus 1 Mbit/s, SMBus/PMBus), SPI (24 Mbit/s, multiplexed with I²S), and two USARTs (master/slave synchronous SPI, one with ISO7816/LIN/IrDA/auto baud rate detection). Housed in an LQFP-32 package (7×7×1.4 mm) with up to 30 fast I/Os (all 5 V-tolerant and mappable on external interrupt vectors), it operates from 2.0 V to 3.6 V over -40 °C to 85 °C. Ideal for consumer electronics, industrial control, home appliances, IoT, and cost-sensitive embedded applications.
Arm Cortex-M0+ Core: 32-bit Arm Cortex-M0+ RISC core, up to 48 MHz, with built-in Nested Vectored Interrupt Controller (NVIC) and Memory Protection Unit (MPU) Memory: 32 KB Flash with protection, 12 KB SRAM with hardware parity check, CRC calculation unit 12-bit ADC: 2.5 MSps, up to 18 channels, 0 to 3.6 V conversion range 3-Channel DMA: Flexible mapping for memory-to-memory, peripheral-to-memory, and memory-to-peripheral transfers Rich Timers: 1x 16-bit advanced motor control PWM timer, 4x 16-bit general-purpose timers, 2x watchdogs (independent + window), SysTick timer — 8 total Low-Power RTC: With alarm, supports wakeup from Stop/Standby mode Communication Interfaces: I2C (Fast-mode Plus 1 Mbit/s, SMBus/PMBus, wakeup from Stop), SPI (24 Mbit/s, multiplexed with I²S), 2x USART (master/slave synchronous SPI, one with ISO7816/LIN/IrDA/auto baud rate detection and wakeup) Low-Power Modes: Sleep, Stop, Standby, Shutdown Clock Management: 4–48 MHz crystal oscillator, 32 kHz crystal oscillator with calibration, internal 48 MHz RC oscillator (±1%), internal 32 kHz RC oscillator (±5%) LQFP-32 Package: 32-pin LQFP (7×7×1.4 mm), up to 30 fast I/Os, all 5 V-tolerant, all mappable on external interrupt vectors High Reliability: Power-on/power-down reset (POR/PDR), programmable brownout reset (BOR), brown-out detect/reset, temperature sensor Wide Operating Range: 2.0 V to 3.6 V, -40 °C to 85 °C Development Support: Serial wire debug (SWD), SESIP3 and PSA Level 3 target certification
Consumer Electronics: Smart wearables, electric toothbrushes, electronic toys, remote controls, power banks Industrial Control: Sensor transmitters, RS-485 communication nodes, small actuators, process monitoring Home Appliances: Induction/microwave oven panels, coffee machines, small appliance controllers IoT Nodes: Wireless sensor terminals, environmental monitoring modules, edge acquisition nodes LED Lighting: Dimming control, RGB strip drivers, switching power supply management Motor Control: Fans, pumps, small motor drives — advanced timer supports motor control Battery Management: Battery protection boards, fuel gauges, charge management
Arm Cortex-M0+ 32-bit Performance: 48 MHz high-performance 32-bit ARM core with built-in MPU, far exceeding 8/16-bit MCU processing capability for complex algorithms 32 KB Flash + 12 KB SRAM Balanced Configuration: 32 KB Flash program memory, 12 KB SRAM with hardware parity check — mainstream configuration in entry-level MCUs High-Speed ADC: 12-bit ADC at 2.5 MSps with 18 channels, ideal for multi-channel high-speed data acquisition High-Speed SPI Communication: 24 Mbit/s SPI interface (multiplexed with I²S), several times faster than traditional 8-bit MCUs for high-speed peripheral communication I2C Fast-mode Plus: 1 Mbit/s I2C with extra current sink, supporting SMBus/PMBus — ideal for power management and sensor applications 3-Channel DMA Offloads CPU: Flexible DMA controller enables direct data transfer between peripherals and memory, significantly reducing CPU load 5V-Tolerant I/Os: All 30 I/Os are 5 V-tolerant, connecting 5 V peripherals without level shifters, reducing BOM cost Flexible Low-Power Management: Four low-power modes including Shutdown for demanding battery-powered applications Low-Power RTC: Built-in hardware RTC with alarm, supporting auto wakeup from low-power modes — ideal for scheduled sensing Mature STM32 Ecosystem: Compatible with STM32CubeIDE, STM32CubeMX, HAL libraries, abundant development boards and reference designs Cost-Effective Entry-Level MCU: 32-bit ARM performance at a competitive price — the ideal upgrade path from 8/16-bit MCUs
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FAQ:
What is the STM32C031K6T6 and what are its key specifications?
The STM32C031K6T6 is a 32‑bit microcontroller from STMicroelectronics, built around an ARM Cortex‑M0+ core running at up to 48 MHz. It offers 32 KB of Flash and 12 KB of SRAM. On‑chip peripherals include a 12‑bit 1 Msps ADC, a TIM1 timer with one complementary PWM pair, plus general‑purpose timers (TIM3, TIM14, TIM16, TIM17), and standard serial interfaces — USART, SPI, and I2C. Housed in an LQFP‑32 package, it provides up to 27 I/O pins and operates over ‑40 °C to +85 °C. As part of the STM32C0 series, this MCU delivers an efficient, cost‑optimized solution for simple embedded applications that benefit from more SRAM and easy hand‑soldering.
What are the package dimensions and I/O count of the STM32C031K6T6?
The device comes in an LQFP‑32 package measuring 7 mm × 7 mm with a lead pitch of 0.8 mm. It provides up to 27 general‑purpose I/O pins. The exposed leads are easy to hand‑solder and visually inspect, making this package ideal for prototyping, low‑volume production, and any design where manual assembly or simple rework is required. The LQFP‑32 format also makes the MCU suitable for breadboard use with inexpensive adapters.
How does the STM32C031K6T6 differ from the STM32C031K6U6? Which package should I pick?
Electrically, the two parts are identical — same Cortex‑M0+ core, 32 KB Flash, 12 KB SRAM, and peripherals. The only difference is the package: the K6T6 uses an LQFP‑32 with 27 I/O pins, while the K6U6 uses a smaller UFQFPN32 (5×5 mm) with 30 I/O pins. Choose the K6T6 when hand‑soldering, visual inspection, and prototyping convenience are priorities. Choose the K6U6 when you need the smallest possible PCB footprint and a few extra I/Os, and your assembly process can handle QFN packages.
How does the STM32C031K6T6 compare with the STM32F031K6T6? What are the main improvements?
Both share the same LQFP‑32 package and pin count, but the C031K6T6 brings significant upgrades. It uses a more efficient ARM Cortex‑M0+ core instead of the older Cortex‑M0, and it triples the SRAM from 4 KB (F031) to 12 KB. This extra RAM is a huge advantage for applications that need larger communication buffers, more complex state machines, or a lightweight RTOS. The C031K6T6 also features a TIM1 timer, but with one complementary PWM pair — enough for an H‑bridge or a single half‑bridge — whereas the F031K6T6 has a full four‑pair TIM1 for three‑phase motor control. If you need three‑phase motor drive, the F031 is still the better choice; for almost anything else, the C031 offers more memory and better energy efficiency.
Does the STM32C031K6T6 have a motor‑control timer? Can it drive a brushless motor?
It includes a TIM1 timer with one complementary PWM pair, programmable dead‑time, and a break input. This single complementary channel can directly drive a single half‑bridge or an H‑bridge, which is perfect for DC motor control, a single‑phase inverter, or a PFC stage. A three‑phase brushless motor requires three complementary pairs, so the C031K6T6 cannot drive one alone. You would need external gate drivers that handle dead‑time and complementary generation, or you can switch to an MCU with a full four‑pair TIM1, such as the STM32F031K6T6 or the STM32G431 series.
What are the ADC specifications of the STM32C031K6T6? How many analog input channels can I use?
The integrated 12‑bit successive‑approximation ADC samples at up to 1 Msps. In the LQFP‑32 package, up to 10 external analog input channels are available (IN0–IN9 through pins PA0–PA7, PB0, and PB1). The ADC can also read the internal temperature sensor and the voltage reference without using any external pins. There is no on‑chip DAC, so an external DAC or a filtered PWM signal must be used to generate analog outputs.
Can the STM32C031K6T6 be powered directly from 5 V? Are its GPIOs 5‑volt tolerant?
The supply voltage must remain within 2.0 V to 3.6 V; 5 V must never be applied to the VDD pin. Most I/O pins (ports A, B, and C) are marked FT (5‑volt tolerant) and can safely accept input voltages up to 5 V. This allows direct connection to 5 V logic devices — you can read their outputs or use open‑drain outputs with external pull‑ups — without external level shifters, greatly simplifying mixed‑voltage designs.
How low is the power consumption of the STM32C031K6T6? Is it suitable for battery operation?
The Cortex‑M0+ core delivers improved energy efficiency. In Run mode at 48 MHz with all peripherals active, the typical current is around 10–12 mA. Sleep mode reduces this to roughly 2–3 mA. In Stop mode, with 12 KB SRAM and registers retained, consumption drops to about 3–5 µA; Standby mode further lowers it to approximately 0.6 µA. Fast wake‑up from Stop mode makes the chip well‑suited for battery‑powered devices that sleep most of the time and wake briefly to perform measurements or transmit data.
How do I program and debug the STM32C031K6T6? What development tools are needed?
Programming and debugging are carried out through the SWD (Serial Wire Debug) interface, needing only SWDIO, SWCLK, VCC, and GND connections. A low‑cost ST‑LINK/V2 or STLINK‑V3 debugger is all the hardware you require. The free STM32CubeIDE is fully supported, and the chip also works with Keil MDK and IAR EWARM. Use STM32CubeMX for graphical pinout, clock, and peripheral configuration. ST provides extensive HAL and LL libraries together with many example projects, helping you quickly move from concept to prototype.
What are the most typical applications for the STM32C031K6T6?
Thanks to its generous 12 KB SRAM, 32 KB Flash, 27 I/O pins, and the easy‑to‑solder LQFP‑32 package, the C031K6T6 is an excellent choice for compact, cost‑sensitive designs that need more RAM than traditional F0 MCUs. Common uses include smart sensors, small home appliances, power tools, battery chargers, simple industrial controllers, and IoT edge nodes. It is especially popular in prototyping and small‑batch production where the LQFP package simplifies assembly and debugging.