Item specifics
Description
The STM32F042G6U6 is a mainstream Arm Cortex-M0 USB line MCU from STMicroelectronics, UFQFPN-28 package (4×4×0.6 mm). 48 MHz Cortex-M0 core, 32 KB Flash, 6 KB SRAM. Integrates crystal-less USB 2.0 FS device, CAN 2.0A/B, HDMI CEC, 12-bit ADC (13 ADC inputs, 1.0 μs), 5-channel DMA, 14-channel capacitive touch, calendar RTC (V_BAT backup), 9 timers (1×16-bit advanced-control/PWM/deadtime, 1×32-bit GP, 4×16-bit GP, independent/window WDG, SysTick), I2C (1 Mbit/s Fast Mode Plus), 2×SPI (18 Mbit/s, 1×I2S mux), 2×USART (1×ISO7816/LIN/IrDA). 24 I/Os (all 5 V-tolerant). VDD 2.0 V–3.6 V, VDDA 2.4 V–3.6 V, -40 °C to 85 °C, ECOPACK®2.
Core: Arm Cortex-M0 48 MHz, NVIC Memory: 32 KB Flash, 6 KB SRAM (HW parity), CRC Crystal-less USB 2.0 FS: Internal 48 MHz oscillator, BCD/LPM CAN: CAN 2.0A/B HDMI CEC: Wakeup on header 12-bit ADC: 13 ADC inputs, 1.0 μs, 0–3.6 V, analog supply 2.4 V–3.6 V 14-ch Capacitive Touch: Keys/linear/rotary 5-ch DMA: Flexible mapping 9 Timers: 1×16-bit advanced-control (6-ch PWM/deadtime), 1×32-bit GP (4 IC/OC/IR decode), 4×16-bit GP, independent/window WDG, SysTick Communication: 1×I2C (1 Mbit/s Fast Mode Plus, SMBus/PMBus, 20 mA sink, Stop wakeup), 2×SPI (18 Mbit/s, 4–16 bit frame, 1×I2S mux), 2×USART (master sync SPI/modem, 1×ISO7816/LIN/IrDA/auto baud/wakeup) Low Power: Sleep/Stop/Standby Clock: 4–32 MHz XTAL, 32 kHz RTC XTAL (calibrated), 8 MHz RC (×6 PLL), 40 kHz RC, 48 MHz RC (auto trim) I/Os: 24 fast I/Os, all ext. interrupt mappable, all 5 V-tolerant Reliability: POR/PDR, PVD, SWD, 96-bit unique ID Supply/Temp: VDD 2.0 V–3.6 V, VDDA 2.4 V–3.6 V, -40 °C to 85 °C Package: UFQFPN-28 (4×4×0.6 mm), Tray
Consumer: Remote controls, toothbrushes, toys, handhelds, PC peripherals Industrial: Sensor transmitters, RS-485/CAN nodes, actuators Motor Control: Fans, pumps, small motors (6-ch PWM/deadtime) Automotive: Light/window control, sensor nodes Home Appliances: Panels, HVAC, alarms, smart lighting IoT: Wireless sensors, environmental monitoring, smart home LED Lighting: Dimming, RGB strips, SMPS HMI: Touch keys/sliders/wheels
UFQFPN-28 Ultra-Compact: 4×4 mm, 24 I/Os, ideal for space-constrained designs Crystal-less USB 2.0 FS: Built-in 48 MHz oscillator eliminates external crystal, simplifies PCB, saves BOM CAN + USB Dual Interface: Rare in this class; meets both industrial bus and general communication needs HDMI CEC: For digital TV, A/V receivers, and consumer electronics 14-ch Capacitive Touch: No external touch IC needed, reduces BOM 32 KB Flash + 6 KB SRAM: 6 KB SRAM meets USB buffering needs 12-bit High-Speed ADC: 1.0 μs, 13 ADC inputs, separate analog supply, analog watchdog 5-ch DMA: Direct peripheral-to-memory transfers, offloads CPU I2C Fast Mode Plus: 1 Mbit/s, 20 mA sink, SMBus/PMBus 9 Timers: Advanced-control/PWM/deadtime + 32-bit IR decode + 4 GP Calendar RTC: Alarm/periodic wakeup, V_BAT backup Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/development boards Cost-Effective: 32-bit ARM + USB + CAN, ideal upgrade from 8/16-bit MCUs
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FAQ:
What is the STM32F042G6U6 and what makes it unique in a 28‑pin Cortex‑M0?
The STM32F042G6U6 is a 48 MHz Arm Cortex‑M0 microcontroller with 32 KB Flash and 6 KB SRAM, housed in an ultra‑compact UFQFPN‑28 package. It stands out by combining a CAN 2.0B controller, a USB 2.0 full‑speed device with a Clock Recovery System (CRS) for crystal‑less operation, a 12‑bit DAC, and capacitive touch‑sensing channels. This rich peripheral mix in a tiny 4×4 mm QFN package makes it one of the most integrated CAN/USB solutions available for space‑constrained industrial sensors, portable CAN diagnostic tools, and miniaturized USB‑to‑CAN bridges.
How does the STM32F042G6U6 differ from the STM32F042F6P6 or STM32F042K6T6? When should I choose the G6U6?
All three share the same core, 32 KB Flash, 6 KB SRAM, CAN, and USB peripherals. The difference is the package: the G6U6 is a UFQFPN‑28 (28 pins, up to 23 I/Os), the F6P6 is a TSSOP‑20 (20 pins, up to 15 I/Os), and the K6T6 is an LQFP‑32 (32 pins, up to 28 I/Os). Choose the G6U6 when you need more I/Os than the tiny TSSOP‑20 offers, but still want a very small footprint that is smaller than the LQFP‑32. It provides the ideal balance of compactness and I/O count for medium‑complexity CAN/USB nodes that cannot afford the space of a 48‑pin package.
How does the STM32F042G6U6 compare to the popular STM32F103C8T6? What are the main trade‑offs?
The STM32F103C8T6 is a 72 MHz Cortex‑M3 with 64 KB Flash and 20 KB SRAM in an LQFP‑48 package. The STM32F042G6U6 runs at a lower 48 MHz, uses a simpler Cortex‑M0 core, and has less Flash and SRAM. However, it adds a built‑in 12‑bit DAC and a capacitive touch‑sensing controller, and it comes in a dramatically smaller 28‑pin QFN package. Most importantly, it includes a CRS for crystal‑less USB, eliminating the external crystal required by the F103. Choose the F042G6U6 when you need a tiny, low‑cost CAN/USB solution with analog output and touch capability, and you do not require the extra memory or CPU horsepower of the F103.
Can the STM32F042G6U6 run CAN and USB simultaneously on a 28‑pin package? Is there a pin conflict?
Yes, the STM32F042G6U6 can operate CAN 2.0B and USB 2.0 full‑speed concurrently without pin conflicts. The CAN TX/RX pins and USB D+/D‑ signals are assigned to separate, dedicated locations. With up to 23 I/Os, you can allocate CAN, USB, one USART, one SPI, one I2C, and still have pins available for the DAC output, touch sensing, or GPIO. STM32CubeMX helps you verify the exact pin‑multiplexing for your design, ensuring all desired interfaces can coexist.
What is the Clock Recovery System (CRS) on the STM32F042G6U6, and why is it important for USB?
The CRS is an internal hardware module that automatically synchronizes the internal 48 MHz RC oscillator to the USB Start‑of‑Frame (SOF) packets from the host. This eliminates the need for an external high‑precision crystal when using USB, saving PCB space and BOM cost. The CRS ensures that the internal clock remains within the USB specification's strict timing tolerances, enabling reliable USB communication in cost‑sensitive, space‑constrained designs. After USB enumeration, the trimmed internal clock can also serve as a precise system clock for other peripherals.
Is 32 KB Flash and 6 KB SRAM enough for a CAN‑USB application? What can I realistically fit?
Absolutely, for dedicated and well‑optimized tasks. A CANopen or J1939 protocol stack, a USB device stack, and application logic can be tightly packed into 32 KB of Flash. The 6 KB SRAM requires careful buffer management—using DMA for serial transfers and keeping large arrays in Flash—but is sufficient for communication buffers and task stacks in many proven designs such as USB‑to‑CAN bridges, compact sensor nodes, and portable diagnostic tools. If your firmware later outgrows the 32 KB limit, you can consider the pin‑compatible STM32F072G6U6 (128 KB Flash, 16 KB SRAM) as a direct upgrade.
Does the STM32F042G6U6 have a DAC and capacitive touch? How many channels?
Yes, the STM32F042G6U6 includes one 12‑bit DAC channel and supports up to 13 capacitive touch‑sensing channels through the integrated Touch Sensing Controller (TSC). The DAC allows you to generate analog control voltages or audio output without external components. The TSC uses the charge‑transfer method and requires only a few external resistors, enabling touch keys, sliders, and wheels directly on the PCB. These features make the F042G6U6 a highly integrated solution for modern control panels and smart sensors that need both analog output and a touch interface.
What low‑power modes does the STM32F042G6U6 support, and can it run from a battery?
The chip supports Sleep, Stop, and Standby modes. In Stop mode with the main regulator off and all 6 KB SRAM retained, the typical current is around 3 µA—extremely low for a 32‑bit MCU with CAN and USB. Wake‑up from Stop is fast enough to respond to CAN bus activity, USB resume, or external interrupts. The 48 MHz Cortex‑M0 core is inherently power‑efficient, making the F042G6U6 an excellent choice for battery‑powered CAN sensors, portable diagnostic tools, and energy‑harvesting devices that spend most of their time in deep sleep.
How does the STM32F042G6U6 compare to the STM32F072G6U6? When should I choose the F042?
The STM32F072G6U6 is the higher‑end sibling with 128 KB Flash, 16 KB SRAM, a second DAC channel, and more touch‑sensing channels. The STM32F042G6U6 is the cost‑optimized version for applications that can work within 32 KB Flash and 6 KB SRAM. Choose the F042G6U6 when your firmware is compact and you want the lowest possible system cost while retaining CAN, USB, DAC, and touch capability. The F072G6U6 is better when you need more code space, larger data buffers, or additional analog channels.
What are the most typical applications for the STM32F042G6U6?
It is widely used in miniaturized USB‑to‑CAN bridges, portable CAN diagnostic dongles, compact industrial CAN‑bus sensors, smart home touch panels, LED lighting controllers, and any space‑constrained embedded system that needs a proven 32‑bit core with CAN, USB, DAC, and touch‑sensing. Its tiny UFQFPN‑28 package and integrated CRS for crystal‑less USB make it a go‑to choice for cost‑sensitive, high‑volume connected devices.