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STMicroelectronics STM32F042C6U6
- Part No.:
- STM32F042C6U6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32F042C6U6.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:5,623
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Product details
Overview
STM32F042C6U6 from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 32 KB Flash, 6 KB SRAM, crystal-less USB 2.0 FS interface, CAN 2.0B controller, and 12-bit ADC (1.0 µs conversion). It operates from 2.0–3.6 V and supports up to 48 MHz CPU frequency. Used in industrial sensor nodes requiring integrated USB-CDC communication, CAN bus connectivity, and capacitive touch sensing.
For engineers reviewing the STM32F042C6U6 datasheet, STM32F042C6U6 pinout, STM32F042C6U6 application, or STM32F042C6U6 equivalent, key selection criteria include USB 2.0 full-speed operation without external crystal, CAN transceiver integration readiness, 5 V-tolerant I/O count (up to 24), and support for hardware CRC and SWD debug.
Technical Context
The device integrates an ARM Cortex-M0 core with tightly coupled NVIC, supporting nested interrupts and low-latency peripheral handling. Its clock system includes internal 48 MHz oscillator with automatic trimming via USB SOF synchronization-enabling crystal-less USB operation-and dual oscillators (HSE/LSE) for RTC and high-precision timing.
Peripheral architecture features one advanced-control timer (TIM1) for 6-channel PWM, nine total timers including SysTick and watchdogs, and dual USARTs-one with ISO7816, LIN, IrDA, and auto-baud detection-alongside two SPIs (one multiplexed with I2S) and Fast Mode Plus I²C (1 Mbit/s).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M0, 48 MHz max - enables real-time control with deterministic interrupt latency & low power consumption. |
| Memory | 32 KB Flash + 6 KB SRAM with HW parity - sufficient for USB/CAN protocol stacks and firmware with safety-critical data integrity. |
| USB Interface | USB 2.0 Full-Speed, crystal-less - eliminates external 48 MHz crystal and associated BOM cost, simplifies layout. |
| CAN Interface | CAN 2.0B controller - supports industrial fieldbus communication up to 1 Mbps with message filtering and FIFO buffering. |
| ADC | 12-bit, 1.0 µs conversion, 10-channel - suitable for fast analog monitoring (e.g., battery voltage, temperature, current sense) with <1 LSB INL. |
| I/O Capability | Up to 38 fast I/Os, 24 with 5 V tolerance - allows direct interfacing with legacy 5 V logic and industrial sensors without level shifters. |
| Low-Power Modes | Sleep, Stop, Standby with RTC/VBAT backup - achieves sub-1 µA standby current enabling multi-year battery life in remote nodes. |
Pinout & Package
STM32F042C6U6 is housed in a 48-pin LQFP package (7 × 7 mm, 0.5 mm pitch) compliant with ECOPACK®2 environmental standards. Pin assignments are validated per ST's DocID025832 Rev 5, Section 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VSS, VSSA | Power supply and ground | Digital (2.0–3.6 V), analog (2.4–3.6 V), and separate ground domains ensure noise isolation for ADC/RTC. |
| PA11/PA12 | USB DM/DP | Dedicated full-speed USB pins with internal transceivers - no external PHY required; supports BCD and LPM. |
| PB8/PB9 | CAN_RX/CAN_TX | Direct connection to external CAN transceiver - supports 1 Mbps bit rate with programmable filter banks. |
| PA0–PA7, PB0–PB15, PC13–PC15 | General-purpose I/O | 38 total GPIOs; 24 tolerate 5 V, 8 support independent VDDIO2 supply - enables mixed-voltage system interfacing. |
| NRST | Active-low reset | Asynchronous reset input with internal pull-up; supports external reset button or supervisor IC assertion. |
| SWDIO/SWCLK | Serial Wire Debug | 2-pin debug interface for programming and real-time trace - replaces JTAG, saves PCB space and pins. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less USB 2.0 FS | Internal 48 MHz HSI48 oscillator trimmed by USB SOF packets - eliminates external crystal, reduces BOM and layout complexity. |
| Capacitive Touch Sensing | 14-channel TSC supporting touchkey, linear, and rotary sensors - enables intuitive HMI without external ICs or firmware overhead. |
| Hardware CRC Unit | Dedicated 32-bit CRC engine compliant with IEEE-802.3 - accelerates firmware update validation and secure boot integrity checks. |
| Programmable Voltage Detector | Configurable threshold (2.0–2.9 V) with interrupt generation - enables graceful shutdown or brown-out recovery before system failure. |
| Independent VDDIO2 Supply | 8 I/Os powered by separate 1.65–3.6 V rail - permits interfacing with low-voltage peripherals (e.g., 1.8 V sensors) while maintaining 3.3 V core logic. |
Applications
| Industrial Sensor Node | USB-CDC Gateway |
|---|---|
Use Scenario: Compact environmental monitor deployed in factory automation, measuring temperature, humidity, and vibration via analog/digital sensors. IC Role / Device Role / Timing Role: Central MCU executing sensor fusion, CAN bus reporting, and USB virtual COM port bridging to host PC. Use Value: Integrated 12-bit ADC, CAN controller, and crystal-less USB eliminate discrete signal conditioning and PHY components - reducing bill-of-materials and board area by >30%. | Use Scenario: Field-deployable diagnostic tool connecting legacy RS-485/CAN devices to Windows/Linux hosts via USB serial emulation. IC Role / Device Role / Timing Role: Protocol translator running dual UART-to-USB CDC firmware with real-time packet buffering and error recovery. Use Value: Dual USARTs (one with ISO7816/LIN/IrDA) and hardware flow control enable simultaneous legacy interface support - eliminating need for external bridge ICs. |
| Capacitive Touch Panel | Smart Power Outlet |
Use Scenario: Wall-mounted light switch with slider dimmer and tap buttons, operating on single 3.3 V supply. IC Role / Device Role / Timing Role: Touch controller managing 12-channel TSC, LED PWM dimming via TIM1, and relay control via GPIO. Use Value: On-chip TSC with hardware charge transfer and noise filtering achieves >80 dB SNR - enabling robust operation in EMI-heavy residential environments. | Use Scenario: Wi-Fi-enabled smart outlet monitoring load current, voltage, and energy consumption while enforcing overcurrent cutoff. IC Role / Device Role / Timing Role: Safety-critical subsystem MCU performing real-time RMS current calculation, thermal monitoring, and fail-safe relay disengagement. Use Value: Hardware CRC, SRAM parity, and independent watchdog ensure functional safety compliance (IEC 61508 SIL-2) without external monitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F072CBT6 | 64 KB Flash, 16 KB SRAM, USB OTG FS, no CAN | Lacks CAN interface but adds USB OTG host/device capability and higher memory | Select when USB host functionality or larger code footprint is required, and CAN is not needed. |
| STM32F048CT6 | Same Flash/SRAM, adds USB Battery Charging Detection (BCD) v1.2, same CAN/USB | Enhanced USB charging port compliance for consumer-facing devices | Select for end products requiring USB wall charger recognition and enumeration without host negotiation. |
Compared with STM32F042C6U6, STM32F072CBT6 trades CAN for USB OTG and memory headroom, while STM32F048CT6 extends USB charging compliance-making the C6U6 optimal for cost-sensitive industrial CAN+USB nodes where BCD is unnecessary.
Availability
STM32F042C6U6 is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-CDC gateways, capacitive touch panels, and smart power outlets requiring stable component supply across extended production lifecycles.
Supply support for STM32F042C6U6 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-grade components since 1987.
The STM32F0 series targets cost-sensitive, low-power embedded applications requiring ARM Cortex-M0 performance with rich analog/peripheral integration - optimized for industrial control, appliance HMI, and IoT edge nodes.
FAQ
Does STM32F042C6U6 support USB device mode without an external crystal?
Yes. The device integrates an internal 48 MHz HSI48 oscillator with automatic trimming synchronized to USB Start-of-Frame (SOF) packets. This enables full-speed USB 2.0 device operation without any external crystal or oscillator, reducing BOM cost and PCB layout complexity.
What is the maximum number of 5 V-tolerant I/Os on STM32F042C6U6?
The STM32F042C6U6 provides up to 24 5 V-tolerant I/Os across GPIO ports A, B, and C. These pins accept input voltages up to 5.5 V while operating from a 3.3 V supply, enabling direct interface with legacy 5 V logic and industrial sensors without external level shifters.
Can the built-in CAN controller operate at 1 Mbps?
Yes. The integrated CAN 2.0B controller supports bit rates up to 1 Mbps under standard electrical conditions (with appropriate external transceiver). It includes three transmission mailboxes, two receive FIFOs, and 14 filter banks - meeting requirements for industrial fieldbus and automotive body networks.
Is hardware CRC acceleration available, and what polynomial does it implement?
Yes. The device includes a dedicated 32-bit CRC calculation unit implementing the IEEE-802.3 standard polynomial (0x04C11DB7). It supports programmable seed value and byte/word data input, accelerating firmware image verification and secure boot integrity checks in real time.
STM32F042C6U6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-UFQFN Exposed Pad
- Series:
- STM32F0
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0
- Core Size:
- 32-Bit Single-Core
- Speed:
- 48MHz
- Connectivity:
- CANbus, HDMI-CEC, I2C, IrDA, LINbus, SPI, UART/USART, USB
- Peripherals:
- DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 6K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 13x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32F042C6U6 FAQ
1.How can I place an order for STM32F042C6U6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F042C6U6 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 STM32F042C6U6 reliable?
The price and inventory of STM32F042C6U6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F042C6U6 is usually 5 days.
3.What payment methods are accepted for STM32F042C6U6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F042C6U6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F042C6U6?
STM32F042C6U6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F042C6U6 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 STM32F042C6U6?
For technical support, including STM32F042C6U6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F042C6U6 requirements.
6.How does Aetrix verify that STM32F042C6U6 is sourced from the original manufacturer or authorized distributors?
All STM32F042C6U6 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 STM32F042C6U6 meets industry standards.
7.What is the process for return or replacement of STM32F042C6U6?
All STM32F042C6U6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32F042C6U6, 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 STM32F042C6U6 part is unused and in its original packaging.
Return procedure for STM32F042C6U6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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