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STMicroelectronics STM32C031K4U7
- Part No.:
- STM32C031K4U7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32C031K4U7.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,314
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Product details
Overview
STM32C031K4U7 from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 32 KB flash, 12 KB SRAM with hardware parity, 48 MHz max CPU frequency, 12-bit ADC (0.4 µs conversion), and dual USARTs with LIN/ISO7816 support - deployed in industrial sensor nodes and smart metering front-ends.
For engineers reviewing the STM32C031K4U7 datasheet, STM32C031K4U7 pinout, STM32C031K4U7 application, or STM32C031K4U7 equivalent, key selection criteria include 5 V-tolerant I/O count (up to 45), low-power Stop/Standby modes (1.2 µA typical), integrated CRC unit, and SWD debug interface compatibility with ST-LINK v2.1.
Technical Context
The STM32C031K4U7 integrates an Arm Cortex-M0+ core with MPU, supporting TrustZone-like memory protection for secure peripheral access control. It implements a dual-oscillator clock system: 4–48 MHz HSE and 32 kHz LSE with calibration, plus factory-trimmed 48 MHz HSI (±1 %) and 32 kHz LSI (±5 %).
Its analog subsystem includes a 12-bit ADC with up to 19 external channels, internal temperature sensor, and VREFINT reference - all operating across the full −40°C to 125°C extended temperature range. Peripheral interconnect uses a dedicated AHB/APB matrix enabling concurrent DMA transfers and timer-triggered ADC sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M0+, 48 MHz max - enables real-time deterministic execution for motor control loops and protocol stacks. |
| Flash / RAM | 32 KB flash with readout protection; 12 KB SRAM with hardware parity - supports robust firmware updates and data integrity in field-deployed devices. |
| ADC | 12-bit, 0.4 µs conversion time, 19-channel input - delivers high-speed analog sensing for battery monitoring and environmental sensing. |
| Timers | 8 timers: 1x advanced-control (TIM1), 4x general-purpose (TIM3/14/16/17), 2x watchdogs - supports PWM generation, encoder interfacing, and safety-critical timeout supervision. |
| Communication | 2× USART (1 with ISO7816/LIN/IrDA), 1× I²C (Fast-mode Plus, 1 Mbit/s), 1× SPI (24 Mbit/s) - enables multi-protocol connectivity in utility metering and industrial gateways. |
| Power Range | 2.0 V to 3.6 V supply - compatible with single-cell Li-ion, 3.3 V rail systems, and energy-harvesting power sources. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive sensors and industrial PLC I/O modules. |
| I/O Tolerance | All 45 GPIOs 5 V-tolerant - simplifies level-shifting in mixed-voltage systems interfacing with legacy 5 V peripherals. |
Pinout & Package
STM32C031K4U7 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5 × 5 mm with 0.5 mm pitch and exposed thermal pad. This RoHS-compliant, ECOPACK2-qualified package supports automated optical inspection and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O power supply | Primary 2.0–3.6 V input; requires local 100 nF decoupling per VDD pin for stable operation at 48 MHz. |
| VSS | Ground reference | Dedicated ground pins for analog/digital domains - must be connected to low-impedance PCB plane to minimize noise coupling into ADC. |
| PA0–PA15 | General-purpose I/O bank A | 16 pins with configurable alternate functions including USART2_TX/RX, TIM1_CH1/CH2, ADC1_IN0–IN15 - supports flexible peripheral mapping via AFIO registers. |
| PB0–PB15 | General-purpose I/O bank B | 16 pins including I2C1_SCL/SDA, USART1_TX/RX, SPI1_NSS/SCK/MISO/MOSI - enables simultaneous I²C sensor bus and SPI flash communication. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts 1.65 V min logic high - used for external reset button or supervisor IC integration. |
| SWDIO / SWCLK | Serial Wire Debug interface | Two-pin debug port supporting programming, real-time trace, and breakpoint debugging - eliminates need for JTAG header space. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power modes | Stop mode draws 1.2 µA (typical) with RTC running - extends battery life in wireless sensor transmitters beyond 10 years. |
| Hardware CRC unit | Dedicated 32-bit CRC engine supporting multiple polynomials - accelerates firmware image verification and secure OTA update integrity checks. |
| Programmable BOR | 4-level brownout reset threshold (2.0/2.2/2.4/2.7 V) - prevents erratic behavior during brownout conditions in unregulated power supplies. |
| Calendar RTC | Hardware calendar with alarm and tamper detection - enables time-stamped logging and scheduled wake-up without external RTC chip. |
| 5 V-tolerant I/Os | All 45 GPIOs tolerate 5 V inputs while powered from 3.3 V - eliminates external level shifters when interfacing with 5 V UART peripherals or sensors. |
| ECOPACK2 compliance | Halogen-free, lead-free, RoHS-compliant packaging - meets EU environmental directives for industrial and consumer equipment. |
Applications
| Smart Energy Metering | Industrial Sensor Node |
|---|---|
Use Scenario: Bidirectional electricity meter with tariff switching, tamper detection, and RS-485/IR communication. IC Role / Device Role / Timing Role: Main controller executing DLMS/COSEM stack, managing metrology ADC sampling, and driving real-time clock/calendar. Use Value: Integrated ISO7816-capable USART enables secure IR communication with handheld readers; 125°C rating supports transformer-mounted deployment. |
Use Scenario: Wireless vibration/temperature node in predictive maintenance systems using LoRaWAN or NB-IoT backhaul. IC Role / Device Role / Timing Role: Edge processing unit acquiring analog sensor data, performing FFT preprocessing, and managing ultra-low-power sleep/wake cycles. Use Value: 1.2 µA Stop mode current with RTC active extends coin-cell battery life >5 years; 5 V-tolerant GPIOs simplify connection to legacy 5 V analog sensors. |
| Motor Control Interface | Building Automation Controller |
Use Scenario: Brushless DC motor driver board with Hall-effect feedback, current sensing, and CAN-to-serial bridge. IC Role / Device Role / Timing Role: Real-time commutation controller generating 3-phase PWM via TIM1, reading ADC current samples, and translating CAN commands to UART commands. Use Value: Advanced-control timer with dead-time insertion and fault input ensures safe gate-driver sequencing; 48 MHz core handles 20 kHz PWM carrier frequency. |
Use Scenario: HVAC zone controller integrating temperature/humidity sensing, relay actuation, and BACnet MS/TP over RS-485. IC Role / Device Role / Timing Role: System-on-chip managing multi-sensor fusion, PID loop execution, and serial protocol translation between BACnet and local peripherals. Use Value: Dual USARTs allow simultaneous BACnet MS/TP and debug console; hardware parity on SRAM prevents control logic corruption in EMI-heavy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32G031F8P6 | Same Cortex-M0+, but 64 KB flash, no VREFINT, lower ADC resolution (12-bit but no hardware oversampling) | Better suited for firmware-rich applications requiring larger code space; lacks calibrated internal reference for precision analog sensing | Select when flash headroom >32 KB is critical and analog accuracy requirements are relaxed |
| RP2040 | Dual-core Arm Cortex-M0+, 2 MB flash, no hardware parity, no BOR, operates only at 1.8–3.3 V | Targeted at cost-sensitive consumer electronics; lacks industrial temp grade and safety features like CRC unit or programmable BOR | Choose for high-volume, non-safety-critical designs where dual-core concurrency outweighs industrial reliability needs |
Compared with STM32G031F8P6, the STM32C031K4U7 offers superior analog subsystem calibration and extended temperature qualification; versus RP2040, it provides certified industrial robustness, hardware memory protection, and guaranteed 125°C operation - making it the preferred choice for certified industrial and utility-grade deployments.
Availability
STM32C031K4U7 is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, motor control interfaces, and building automation controllers requiring stable component supply across long product lifecycles.
Supply support for STM32C031K4U7 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 STM32C0 series targets cost-sensitive, high-reliability industrial and utility applications - emphasizing extended temperature operation, hardware security primitives, and minimal bill-of-materials through integrated analog and communication peripherals.
FAQ
What is the maximum operating frequency and voltage range of the STM32C031K4U7?
The STM32C031K4U7 operates at up to 48 MHz CPU frequency across a supply voltage range of 2.0 V to 3.6 V. Its internal 48 MHz RC oscillator is factory-trimmed to ±1 % accuracy, eliminating the need for an external crystal in many timing-critical applications while maintaining robust performance across −40°C to +125°C.
Does the STM32C031K4U7 support hardware-based memory protection?
Yes - it includes a Memory Protection Unit (MPU) that enforces privilege levels and region-based access control for both flash and SRAM. This allows secure separation of bootloader, application, and peripheral drivers, preventing unauthorized code execution or data corruption - a requirement for IEC 62443-compliant industrial firmware architectures.
How many communication interfaces does the STM32C031K4U7 provide, and which support wake-up from low-power modes?
The device integrates two USARTs, one I²C (Fast-mode Plus), and one SPI. Both USARTs and the I²C interface support wake-up from Stop mode - enabling event-driven communication without continuous polling. The first USART also supports LIN physical layer and ISO7816 smart card protocols, making it suitable for utility meter IR communication.
What package type and pin count does the STM32C031K4U7 use, and is it compatible with standard reflow profiles?
The STM32C031K4U7 uses a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch) with an exposed thermal pad. It is qualified for standard IPC/JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C, and complies with ECOPACK2 environmental standards - ensuring compatibility with high-volume SMT assembly lines.
STM32C031K4U7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32C0
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit
- Speed:
- 48MHz
- Connectivity:
- I2C, IrDA, LINbus, SMBus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
- Number of I/O:
- 30
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 12K x 8
- Voltage - Supply (Vcc/Vdd):
- 2V ~ 3.6V
- Data Converters:
- A/D 18x12b SAR
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32C031K4U7 FAQ
1.How can I place an order for STM32C031K4U7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32C031K4U7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32C031K4U7 reliable?
The price and inventory of STM32C031K4U7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32C031K4U7 is usually 5 days.
3.What payment methods are accepted for STM32C031K4U7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32C031K4U7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32C031K4U7?
STM32C031K4U7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32C031K4U7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32C031K4U7?
For technical support, including STM32C031K4U7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32C031K4U7 requirements.
6.How does Aetrix verify that STM32C031K4U7 is sourced from the original manufacturer or authorized distributors?
All STM32C031K4U7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32C031K4U7 meets industry standards.
7.What is the process for return or replacement of STM32C031K4U7?
All STM32C031K4U7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32C031K4U7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32C031K4U7 part is unused and in its original packaging.
Return procedure for STM32C031K4U7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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