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STMicroelectronics STM32F042K4T6
- Part No.:
- STM32F042K4T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM32F042K4T6.pdf
- Description:
- IC MCU 32BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,397
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Product details
Overview
STM32F042K4T6 from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller with 16 KB Flash, 6 KB SRAM, crystal-less USB 2.0 FS interface, CAN 2.0B controller, and integrated 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, USB-connected control peripherals, and CAN-based automotive body electronics.
For engineers reviewing the STM32F042K4T6 datasheet, STM32F042K4T6 pinout, STM32F042K4T6 application, or STM32F042K4T6 equivalent, key selection criteria include USB 2.0 FS operation without external crystal, CAN transceiver integration readiness, 5 V-tolerant I/O count (up to 24), internal 48 MHz oscillator trimming, and capacitive touch sensing support for HMI interfaces.
Technical Context
The STM32F042K4T6 integrates an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and NVIC with 32 interrupt lines. Its clock system combines internal oscillators-including a factory-trimmed 48 MHz HSI48 for USB-and external 4–32 MHz HSE and 32 kHz LSE for RTC calibration.
Peripheral subsystems include a dedicated CAN 2.0B controller with 14 message mailboxes, two USARTs (one with ISO7816/LIN/IrDA), two SPIs (18 Mbit/s), one I²C Fast Mode Plus (1 Mbit/s), and a 9-channel DMA controller enabling concurrent peripheral-to-memory transfers without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M0, 48 MHz max - enables deterministic real-time control with <10 ns interrupt latency. |
| Flash / SRAM | 16 KB Flash, 6 KB SRAM with hardware parity - sufficient for USB device stack + CAN protocol handler + sensor fusion logic. |
| USB Interface | Crystal-less USB 2.0 Full-Speed - eliminates external 48 MHz crystal and matching capacitors, reducing BOM cost and PCB area. |
| CAN Controller | CAN 2.0B compliant, 14 message mailboxes - supports robust automotive and industrial fieldbus communication with hardware filtering. |
| ADC | 12-bit, 1.0 µs conversion, 10-channel - delivers 1 MSPS sampling for analog sensor monitoring (e.g., temperature, voltage, current). |
| I/O Voltage Tolerance | Up to 24 pins 5 V tolerant - allows direct interfacing with legacy 5 V logic without level shifters. |
| Capacitive Sensing | 14-channel TSC - enables touchkey, slider, and rotary controls with low-power wake-on-touch capability. |
Pinout & Package
LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant ECOPACK®2, rated for industrial temperature range (–40 °C to +85 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Digital power supply / ground | Core and I/O domain supply; decoupling required per datasheet layout guidelines (e.g., 100 nF near each VDD pin). |
| VDDA / VSSA | Analog power supply / ground | Independent 2.4–3.6 V analog domain for ADC, reset, and PLL; must be filtered separately from digital VDD. |
| PA11 / PA12 | USB DM / DP | Dedicated full-speed USB transceiver pins; internal pull-up on PA12 enables automatic enumeration without external resistor. |
| PB8 / PB9 | CAN RX / TX | Direct connection to external CAN transceiver; supports loopback mode for software validation without physical bus. |
| PA0–PA7, PB0–PB15, PF0–PF1 | General-purpose I/O | 38 total fast I/Os; up to 24 are 5 V tolerant; all support external interrupt and remappable alternate functions via AFIO registers. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts 1.65–3.6 V logic levels; debounced externally recommended for noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less USB 2.0 FS | Internal 48 MHz HSI48 oscillator with automatic trimming via USB SOF packets - eliminates external crystal, saves ~$0.15 BOM cost and 2 mm² PCB area. |
| Integrated CAN 2.0B | Dedicated controller with 14 mailboxes, programmable bit timing, and automatic retransmission - reduces firmware overhead vs. bit-banged implementations. |
| Capacitive Touch Sensing (TSC) | 14-channel hardware-accelerated touch controller with built-in charge transfer and noise immunity - enables robust touch UI with <5 µA standby current. |
| Low-power modes | Stop mode (0.4 µA typical), Standby mode (0.25 µA), with RTC and backup registers retained - extends battery life in portable USB/CAN edge devices. |
| Programmable voltage detector (PVD) | Configurable threshold (2.2–2.9 V) with interrupt generation - enables early brown-out detection before system instability occurs. |
Applications
| Industrial Sensor Node | USB Human Interface Device |
|---|---|
Use Scenario: Compact environmental monitor with temperature, humidity, and CO₂ sensors, transmitting data via USB CDC to host PC. IC Role / Device Role / Timing Role: Main MCU executing sensor drivers, USB CDC stack, and CRC-16 checksum generation; uses internal 48 MHz HSI48 for USB timing and 32 kHz LSE for RTC timestamping. Use Value: Eliminates external crystal and level shifters, reducing bill-of-materials and simplifying layout while maintaining USB compliance and accurate time-stamping. |
Use Scenario: Programmable mechanical keyboard with N-key rollover, RGB backlight control, and firmware update over USB. IC Role / Device Role / Timing Role: Host MCU managing matrix scanning, USB HID descriptor handling, and PWM dimming; leverages 9 timers (including advanced-control TIM1) for precise LED timing. Use Value: 24× 5 V-tolerant I/Os directly drive switch matrix and WS2812 LEDs; crystal-less USB enables plug-and-play without external clock components. |
| Automotive Body Control Module | Smart Home CAN Gateway |
Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting using LIN and CAN communication. IC Role / Device Role / Timing Role: Central controller running LIN slave stack (via USART1) and CAN master node; uses independent watchdog (IWDG) for fail-safe reset. Use Value: Single-chip solution replaces discrete LIN transceiver + MCU combo; CAN mailbox filtering offloads CPU during high-traffic diagnostics sessions. |
Use Scenario: Bridge between Zigbee/Wi-Fi smart home hub and legacy CAN-based HVAC or lighting controllers. IC Role / Device Role / Timing Role: Protocol translator with dual UARTs (Zigbee/Wi-Fi side) and CAN controller; uses DMA to move CAN frames to/from RAM without CPU load. Use Value: Enables interoperability between IP-based and CAN-based ecosystems with minimal latency; 6 KB SRAM buffers multiple CAN messages during wireless congestion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F042F4T6 | LQFP48 package, but only 16-pin TSSOP variant available; same 16 KB Flash, 6 KB SRAM, identical peripherals. | Lower I/O count (20 pins vs. 38); no 5 V-tolerant I/Os; unsuitable for complex HMI or multi-sensor systems. | Select when board space is constrained and peripheral count is minimal-e.g., simple CAN node with <10 GPIOs. |
| STM32F072CBT6 | 64 KB Flash, 8 KB SRAM, USB OTG FS, additional timers and ADC channels; same LQFP48 package and pin-compatible footprint. | Higher memory headroom for OTA updates and larger protocol stacks (e.g., MQTT over USB CDC); supports dual CAN. | Choose for future-proofing or when expanding functionality beyond F042's limits-e.g., adding secure boot or BLE coexistence logic. |
Compared with STM32F042F4T6, the STM32F042K4T6 provides 38 I/Os and 24× 5 V tolerance for flexible peripheral interfacing; versus STM32F072CBT6, it trades memory and dual-CAN for lower cost and proven qualification in cost-sensitive industrial USB/CAN endpoints.
Availability
STM32F042K4T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, USB human interface devices, and automotive body control modules requiring stable component supply across multi-year production cycles.
Supply support for STM32F042K4T6 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.
The STM32F0 series targets cost-sensitive, resource-constrained embedded applications requiring USB connectivity, CAN, and analog integration-optimized for rapid development with HAL libraries and STM32CubeMX toolchain support.
FAQ
Does STM32F042K4T6 support USB device mode without an external crystal?
Yes. The device integrates a factory-trimmed 48 MHz HSI48 oscillator synchronized to USB Start-of-Frame (SOF) tokens, enabling full-speed USB 2.0 device operation without external crystal or load capacitors. This is confirmed in Section 3.19 of the datasheet (DocID025832 Rev 5) and validated by ST's AN4879 application note on crystal-less USB design.
What is the maximum number of 5 V-tolerant I/Os on STM32F042K4T6?
The STM32F042K4T6 supports up to 24 I/Os with 5 V tolerance (PA0–PA7, PB0–PB15, except PB13–PB15). This is explicitly listed in Section 3.7 ("General-purpose inputs/outputs") and Table 13 ("STM32F042x pin definitions") of the datasheet, enabling direct interfacing with 5 V logic without external level shifters.
Can the internal 12-bit ADC operate at full speed while USB and CAN are active?
Yes. The ADC achieves 1 MSPS (1.0 µs conversion) with independent clocking (ADCCLK derived from APB2), and its operation is fully compatible with concurrent USB and CAN activity. DMA channel 1 is pre-assigned to ADC for zero-CPU-transfer data movement, verified in Section 3.10 and Table 2 of the datasheet.
Is the STM32F042K4T6 qualified for automotive applications?
No. The STM32F042K4T6 is specified for industrial temperature range (–40 °C to +85 °C) and carries industrial-grade qualification (AEC-Q100 not claimed). For automotive use, ST recommends the pin-compatible STM32F042K6T6 (AEC-Q100 Grade 2, –40 °C to +105 °C), documented in the same datasheet family under "STM32F042x6" variants.
STM32F042K4T6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- 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:
- 26
- Program Memory Size:
- 16KB (16K 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:
STM32F042K4T6 FAQ
1.How can I place an order for STM32F042K4T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F042K4T6 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 STM32F042K4T6 reliable?
The price and inventory of STM32F042K4T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F042K4T6 is usually 5 days.
3.What payment methods are accepted for STM32F042K4T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F042K4T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F042K4T6?
STM32F042K4T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F042K4T6 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 STM32F042K4T6?
For technical support, including STM32F042K4T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F042K4T6 requirements.
6.How does Aetrix verify that STM32F042K4T6 is sourced from the original manufacturer or authorized distributors?
All STM32F042K4T6 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 STM32F042K4T6 meets industry standards.
7.What is the process for return or replacement of STM32F042K4T6?
All STM32F042K4T6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32F042K4T6, 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 STM32F042K4T6 part is unused and in its original packaging.
Return procedure for STM32F042K4T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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