Item specifics
Description
The STM32F072C8T6 is a mainstream Arm Cortex-M0 USB line MCU from STMicroelectronics, LQFP-48 package (7×7 mm). 48 MHz Cortex-M0 core, 64 KB Flash, 16 KB SRAM (HW parity). Integrates crystal-less USB 2.0 FS device, CAN 2.0A/B, HDMI CEC, 12-bit ADC (up to 16 channels, 1.0 μs), 12-bit DAC (2 channels), 2 analog comparators, 7-channel DMA, up to 24-channel capacitive touch, calendar RTC (VBAT backup), 12 timers (1×16-bit advanced-control/6-ch PWM/deadtime, 1×32-bit GP, 7×16-bit GP/IC/OC/IR decode, independent/window WDG, SysTick), 2×I2C (1 Mbit/s Fast Mode Plus), 2×SPI (18 Mbit/s, I2S mux), 4×USART (2×ISO7816/LIN/IrDA/auto baud/wakeup). 37 I/Os (36 5V-tolerant, 19 independent VDDIO2). VDD 1.65 V–3.6 V, VDDA 2.0 V–3.6 V, VDDIO2 1.65 V–3.6 V, -40 °C to 85 °C, ECOPACK®2.
Core: Arm Cortex-M0 48 MHz, NVIC, SWD, 96-bit unique ID Memory: 64 KB Flash, 16 KB SRAM (HW parity), CRC Crystal-less USB 2.0 FS: BCD/LPM support, internal 48 MHz oscillator, no external crystal CAN 2.0A/B: Industrial fieldbus communication HDMI CEC: Wakeup on header 12-bit ADC: Up to 16 channels, 1.0 μs, 0–3.6 V, analog supply 2.4 V–3.6 V 12-bit DAC: 2 channels, buffered output 2 Analog Comparators: Programmable input/output 24-ch Capacitive Touch: Keys/linear/rotary 7-ch DMA: Flexible mapping 12 Timers: 1×16-bit advanced-control (6-ch PWM/deadtime), 1×32-bit GP, 7×16-bit GP (IC/OC/IR decode/DAC control), independent/window WDG, SysTick Communication: 2×I2C (1 Mbit/s Fast Mode Plus, 20 mA sink, SMBus/PMBus, Stop wakeup), 4×USART (2×ISO7816/LIN/IrDA/auto baud/wakeup), 2×SPI (18 Mbit/s, I2S mux) Low Power: Sleep/Stop/Standby, VBAT for RTC and backup registers 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: 37 fast I/Os (36 5V-tolerant, 19 independent VDDIO2), all ext. interrupt mappable Supply/Temp: VDD 1.65 V–3.6 V, VDDA 2.0 V–3.6 V, VDDIO2 1.65 V–3.6 V, -40 °C to 85 °C Package: LQFP-48 (7×7 mm), Tray
Industrial: PLCs, sensor transmitters, RS-485/CAN nodes, inverters Motor Control: Fans, pumps, small motors (6-ch PWM/deadtime) HMI: Touch keys/sliders/wheels (24-ch capacitive touch) Consumer: Remote controls, handhelds, PC peripherals, A/V receivers, digital TV Home Appliances: Panels, HVAC, alarms, video intercoms Security: Access control, alarms, smoke detectors IoT: Wireless sensors, environmental monitoring, smart home LED Lighting: Dimming, RGB strips, SMPS
Crystal-less USB + CAN + DAC: One of the most feature-complete models in the STM32F0 USB line with integrated USB 2.0 FS, CAN 2.0A/B, and 12-bit DAC (2-ch) 64 KB Flash + 16 KB SRAM: For complex applications and data buffering 12-bit DAC (2-ch): Buffered output, rare in this class, supports audio/sensor excitation/control loops 24-ch Capacitive Touch: No external touch IC needed, reduces BOM Crystal-less USB 2.0 FS: Eliminates external crystal, simplifies PCB design, saves BOM cost HDMI CEC: For digital TV, A/V receivers, and consumer electronics 7-ch DMA: Direct peripheral-to-memory transfers, offloads CPU 2×I2C Fast Mode Plus: Dual I2C, 1 Mbit/s, 20 mA sink, SMBus/PMBus 4×USART (2×ISO7816/LIN/IrDA): Rare in this class, meeting multi-bus communication needs 12 Timers: Advanced-control/PWM/deadtime + 1×32-bit + 7×16-bit GP/IR decode/DAC control Independent I/O Supply (VDDIO2): 19 I/Os with independent 1.65 V–3.6 V supply, eliminating level shifters Calendar RTC: Alarm/periodic wakeup, VBAT backup Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/development boards Cost-Effective: 32-bit ARM + USB + CAN + DAC + capacitive touch, ideal upgrade from 8/16-bit MCUs
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FAQ:
What is the STM32F072C8T6 and what makes it a great entry‑point for CAN and USB projects?
The STM32F072C8T6 is a 48 MHz Arm Cortex‑M0 microcontroller with 64 KB Flash and 16 KB SRAM, housed in an LQFP‑48 package. It is the most cost‑optimized member of the STM32F072 family that still integrates a CAN 2.0B controller, a USB 2.0 full‑speed device with a Clock Recovery System (CRS) for crystal‑less operation, capacitive touch‑sensing channels, and a 2‑channel 12‑bit DAC. This makes it an ideal single‑chip solution for compact USB‑to‑CAN bridges, smart sensors, and basic control panels that need both fieldbus connectivity and analog output, all at the lowest possible price point for a Cortex‑M0 with these features.
How does the STM32F072C8T6 differ from the STM32F072CBT6? When should I pick the C8T6?
Both share the same core, 16 KB SRAM, CAN, USB with CRS, TSC, and DAC in an LQFP‑48 package. The only difference is Flash size: the C8T6 provides 64 KB, while the CBT6 offers 128 KB. Choose the C8T6 when your firmware fits comfortably within 64 KB and you want the absolute minimum cost. The pin‑compatible CBT6 is a direct drop‑in upgrade if you later need double the Flash with zero PCB changes.
How does the STM32F072C8T6 compare to the popular STM32F103C8T6? What are the main trade‑offs?
The STM32F103C8T6 is a 72 MHz Cortex‑M3 with the same 64 KB Flash and 20 KB SRAM, plus CAN and USB. The STM32F072C8T6 runs at a lower 48 MHz and uses a simpler Cortex‑M0 core, but adds a built‑in DAC, capacitive touch‑sensing channels, and the CRS for crystal‑less USB. It also consumes significantly less power. Choose the F072C8T6 when your design needs CAN, USB, analog output, or a touch interface, and you prioritize lower power, fewer external components, and a more modern analog feature set over raw CPU speed. The F103 is better if you need the extra SRAM and higher processing power.
What is the Clock Recovery System (CRS) on the STM32F072C8T6, 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 even in cost‑sensitive, space‑constrained designs. After USB enumeration, the trimmed internal clock can also serve as a precise system clock for other peripherals.
Can the STM32F072C8T6 run CAN and USB simultaneously on a 48‑pin package? Is there a pin conflict?
Yes, the STM32F072C8T6 can run 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 37 I/Os, you can allocate CAN, USB, two USARTs, SPI, I2C, and still have pins left for touch sensing or the DAC output. STM32CubeMX helps you verify the exact pin‑multiplexing for your design, ensuring all desired interfaces can coexist.
Can the STM32F072C8T6 implement capacitive touch buttons and sliders without extra ICs?
Yes, it supports up to 18 capacitive touch‑sensing channels using ST’s integrated Touch Sensing Controller (TSC). The charge‑transfer method requires only a few external resistors, eliminating the need for a dedicated touch chip. You can implement touch keys, sliders, and wheels directly on the PCB, making it perfect for modern control panels, home appliances, and consumer interfaces. ST provides the free STMTouch library to simplify firmware development.
Is 64 KB Flash and 16 KB SRAM enough for a CAN and USB application? What can I fit in this space?
Absolutely, for dedicated, well‑optimized applications. A CANopen or J1939 protocol stack, a USB device stack, and application logic can be tightly packed into 64 KB of Flash. The 16 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. Many proven CAN‑to‑USB converters, simple motor controllers, and sensor nodes run comfortably in this space. If your firmware later grows, the pin‑compatible STM32F072CBT6 (128 KB Flash) provides a direct upgrade with zero PCB changes.
What low‑power modes does the STM32F072C8T6 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 16 KB SRAM retained, the typical current is around 3 µA—far lower than a comparable Cortex‑M3. Wake‑up from Stop is fast enough to respond to CAN, USB, or external interrupts. The 48 MHz Cortex‑M0 core is inherently power‑efficient, making the F072C8T6 an excellent choice for battery‑powered industrial sensors, portable CAN diagnostic tools, and USB‑connected data loggers that spend most of their time in deep sleep and wake periodically to communicate.
Can I perform over‑the‑air (OTA) firmware updates with the 64 KB single‑bank Flash?
Yes, with strict code‑size discipline. A minimal bootloader (4–8 KB) and a compact application must be implemented. The 16 KB SRAM can temporarily buffer small firmware chunks received via CAN, USB, USART, or a wireless module. A CRC check ensures a safe update. An A/B update scheme is not practical with this Flash size; a download‑and‑overwrite approach is recommended. For more comfortable OTA headroom, the pin‑compatible STM32F072CBT6 (128 KB Flash) provides double the storage.
What are the most typical applications for the STM32F072C8T6?
It is widely used in compact USB‑to‑CAN bridges, industrial CAN‑bus sensor nodes, basic smart home touch panels, portable diagnostic tools, and cost‑sensitive automation controllers. Any embedded system that needs a proven 32‑bit core with CAN, USB, touch‑sensing, and analog output, all in a compact, easy‑to‑solder 48‑pin LQFP package at the absolute lowest cost, is a strong fit for the F072C8T6.