Item specifics
Description
The STM32C031K6U6 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 ultra-compact UFQFPN-32 package (5×5×0.55 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.[reference:6][reference:7]
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%) UFQFPN-32 Package: 32-pin ultra-compact QFN (5×5×0.55 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), temperature sensor Wide Operating Range: 2.0 V to 3.6 V, -40 °C to 85 °C (105 °C/125 °C optional) 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 Ultra-Compact High Integration: 5×5 mm UFQFPN-32 package with 30 I/Os, delivering rich peripherals and I/O resources in a tiny footprint 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 STM32C031K6U6 and what are its key specifications?
The STM32C031K6U6 is a 32‑bit microcontroller from STMicroelectronics built around an ARM Cortex‑M0+ core, running at up to 48 MHz. It provides 32 KB of Flash memory and 12 KB of SRAM. On‑chip peripherals include a 12‑bit 1 Msps ADC, general‑purpose timers (TIM1 with one complementary pair, TIM3, TIM14, TIM16, TIM17), and standard serial interfaces — USART, SPI, and I2C. It is housed in a compact UFQFPN32 package (5 mm × 5 mm) and operates from ‑40 °C to +85 °C. Part of the STM32C0 series, this chip is designed as an entry‑level, cost‑effective solution that brings the efficiency of the Cortex‑M0+ core to simple embedded applications.
What are the package dimensions and I/O count of the STM32C031K6U6?
The device uses a UFQFPN32 package measuring 5 mm × 5 mm with a lead pitch of 0.5 mm. It provides up to 30 general‑purpose I/O pins, which is a generous number for such a small footprint. The package features an exposed pad for grounding and thermal dissipation. Because it is a QFN‑type package, reflow soldering is recommended, though it remains manageable with hot‑air tools for prototyping.
How does the STM32C031K6U6 differ from the STM32F031K6U6? What are the main improvements?
Both chips share the same 32 KB Flash and a pin‑compatible UFQFPN32 package. The key differences are: the C031K6U6 uses an ARM Cortex‑M0+ core instead of the older Cortex‑M0, which brings slightly better power efficiency and a few extra instructions. It also increases the SRAM from 4 KB (on the F031) to 12 KB, a substantial boost that provides more breathing room for communication buffers and task stacks. The timer set is different: the C031K6U6 includes TIM1 with one complementary PWM pair, whereas the F031K6U6 has a full advanced TIM1 with four complementary pairs. Therefore, if you need a three‑phase motor controller in a single chip, the F031 is a better fit; for most other tasks, the C031 offers more SRAM and a more modern core.
How does the STM32C031K6U6 compare with the STM32G031K6U6? Which one should I choose?
Both are Cortex‑M0+ devices at 48 MHz in a UFQFPN32 package. The G031K6U6 offers 32 KB Flash and 8 KB SRAM, while the C031K6U6 increases the SRAM to 12 KB — a 50 % advantage that can be critical for applications needing larger data buffers. The G031 may include a slightly different peripheral mix (e.g., a true random number generator, additional low‑power modes), but the C031 delivers a very similar feature set with a strong focus on memory‑per‑dollar value. Choose the C031K6U6 when you need the extra SRAM and want the most cost‑optimized MCU for simple to mid‑complexity tasks; pick the G031K6U6 if you rely on specific peripherals unique to the G0 series or prefer a more mature platform.
Does the STM32C031K6U6 have a motor‑control timer? Can it drive a brushless motor directly?
It includes a TIM1 timer, but it is configured with one complementary PWM pair only (unlike the four‑pair TIM1 on many other STM32 families). This single complementary channel, together with programmable dead‑time and a break input, is perfect for directly driving a single half‑bridge or an H‑bridge. You can therefore control DC motors, a single‑phase inverter, or a PFC stage. A three‑phase brushless motor requires three complementary pairs; the C031K6U6 cannot drive one by itself, though you can use it with external gate drivers that provide the necessary dead‑time and complementary generation. For a single‑chip three‑phase motor solution, consider the STM32F031K6U6 (Cortex‑M0 with 4‑pair TIM1) or the STM32G431 series.
What are the ADC specifications of the STM32C031K6U6? How many analog channels can I use?
The integrated 12‑bit successive‑approximation ADC operates at up to 1 Msps. On the 32‑pin UFQFPN package, you can access up to 14 external analog input channels. The ADC can also sample the internal temperature sensor and the internal voltage reference without occupying any external pins. There is no on‑chip DAC, so analog outputs must be generated with an external DAC or by low‑pass filtering a PWM signal.
Can the STM32C031K6U6 be powered directly from 5 V? Are its GPIOs 5‑volt tolerant?
The supply voltage must be kept 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 — 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 STM32C031K6U6? Is it suitable for battery operation?
The Cortex‑M0+ core brings improved power efficiency compared to the Cortex‑M0. In Run mode at 48 MHz with all peripherals active, the typical current is around 10–12 mA. Sleep mode drops this to roughly 2–3 mA. In Stop mode, with 12 KB SRAM and registers retained, consumption falls to approximately 3–5 µA; Standby mode further reduces it to about 0.6 µA. Fast wake‑up from Stop mode makes the MCU very well‑suited for battery‑powered devices that spend most of their time sleeping and wake briefly to measure, process, and transmit data.
How do I program and debug the STM32C031K6U6? What development tools are needed?
Programming and debugging use the SWD (Serial Wire Debug) interface, needing only SWDIO, SWCLK, VCC, and GND connections. A low‑cost ST‑LINK/V2 or STLINK‑V3 is all the hardware you need. For software, the free STM32CubeIDE offers full support, and the chip also works with Keil MDK and IAR EWARM. Use STM32CubeMX for graphical pinout, clock, and peripheral configuration. ST provides comprehensive HAL and LL libraries with many example projects, so you can move from idea to prototype very quickly.
What are the most typical applications for the STM32C031K6U6?
With its generous 12 KB SRAM, 32 KB Flash, 30 I/O pins, and an efficient Cortex‑M0+ core, the C031K6U6 is an excellent fit for compact, cost‑conscious designs that need more RAM than older F0 parts could offer. Typical uses include smart sensors, small home appliances, power tools, battery chargers, IoT edge nodes, and simple human‑machine interfaces. It is particularly attractive when you need the memory headroom to handle communication buffers or a small RTOS, but still require the smallest possible PCB footprint and a modern, power‑efficient processor.