Item specifics
Description
The STM32F072CBT6 is a mainstream ARM Cortex-M0 USB line MCU from STMicroelectronics in an LQFP-48 package. It features a 48 MHz Cortex-M0 core, 128 KB Flash, and 16 KB SRAM. The MCU integrates a crystal-less USB 2.0 FS device, CAN 2.0A/B, HDMI CEC, a 12-bit ADC (up to 12 channels, 1.0 µs), a 12-bit DAC (2 channels), a 7-channel DMA, up to 24 capacitive touch sensing channels, a calendar RTC with VBAT backup, and 12 timers. Communication interfaces include 2× I2C (1 Mbit/s Fast Mode Plus), 2× SPI (18 Mbit/s, with I2S mux), and 4× USART (2 with ISO7816/LIN/IrDA/auto baud rate/wakeup). It provides 37 I/Os, operates from a VDD of 1.65 V to 3.6 V over -40 °C to 85 °C, and is ECOPACK®2 compliant.[reference:3]
Core: Arm Cortex-M0 48 MHz, NVIC, SWD Memory: 128 KB Flash, 16 KB SRAM (HW parity), CRC Crystal-less USB 2.0 FS: BCD/LPM support, internal 48 MHz oscillator CAN 2.0A/B: Industrial fieldbus communication HDMI CEC: Wakeup on header reception 12-bit ADC: Up to 12 channels, 1.0 µs, 0–3.6 V, separate analog supply 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), 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, all ext. interrupt mappable Supply/Temp: VDD 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) 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
128 KB Flash + 16 KB SRAM: For complex protocol stacks and algorithms Crystal-less USB + CAN + DAC: Rare tri-combination in this class for industrial bus, general communication, and analog output 12-bit DAC (2-ch): Buffered output, 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, 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 + 1× 32-bit + 7× 16-bit GP/IR decode/DAC control 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 STM32F072CBT6 and what makes it special among 48‑pin Cortex‑M0 MCUs?
The STM32F072CBT6 is a 48 MHz Arm Cortex‑M0 microcontroller with 128 KB Flash and 16 KB SRAM, housed in an LQFP‑48 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, capacitive touch‑sensing channels, and a 2‑channel 12‑bit DAC. This rich peripheral set in a standard, hand‑solderable 48‑pin body makes it an exceptionally cost‑effective and compact solution for USB‑to‑CAN bridges, smart sensors, and control panels that need both fieldbus connectivity and a modern touch interface.
How does the STM32F072CBT6 differ from the STM32F072RBT6? When should I pick the 48‑pin CBT6?
Both share the same core, 128 KB Flash, 16 KB SRAM, CAN, USB with CRS, TSC, and DAC. The only difference is the package: the CBT6 is an LQFP‑48 with up to 37 I/Os, while the RBT6 is an LQFP‑64 with up to 52 I/Os. Choose the CBT6 when board space is tight and 37 I/Os are sufficient for your design. It keeps all the advanced features of the F072 line while saving valuable PCB area and cost. The RBT6 is better if you need more GPIOs for additional sensors, actuators, or a parallel display interface.
How does the STM32F072CBT6 compare to the popular STM32F103C8T6? What are the main trade‑offs?
The STM32F103C8T6 is a 72 MHz Cortex‑M3 with 64 KB Flash, 20 KB SRAM, CAN, and USB. The STM32F072CBT6 runs at a lower 48 MHz and uses a simpler Cortex‑M0 core, but provides double the Flash (128 KB), a built‑in DAC, capacitive touch‑sensing channels, and the CRS for crystal‑less USB. It also consumes significantly less power. Choose the F072CBT6 when your design needs CAN, USB, analog output, or a touch interface, and you want more code storage, lower power, and a reduced external component count. The F103 is better if you need the extra CPU speed or slightly more SRAM.
What is the Clock Recovery System (CRS) on the STM32F072CBT6, 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.
Can the STM32F072CBT6 run CAN and USB simultaneously on a 48‑pin package? Is there a pin conflict?
Yes, the STM32F072CBT6 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 STM32F072CBT6 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 128 KB Flash and 16 KB SRAM enough for a CAN‑USB application with a touch interface?
Absolutely. 128 KB of Flash provides ample space for a real‑time OS, a CANopen or J1939 protocol stack, a USB device stack, a touch‑sensing library, and application code. 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, task stacks, and touch‑sensor data. Many proven industrial gateways, smart home panels, and automotive diagnostic tools run comfortably within this memory envelope. If your firmware later grows, the pin‑compatible STM32F091CCT6 (256 KB Flash, 32 KB SRAM) provides a direct upgrade path with no PCB changes.
What low‑power modes does the STM32F072CBT6 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 F072CBT6 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 128 KB single‑bank Flash?
Yes. You can partition the 128 KB Flash into a small bootloader (8–16 KB) and a compact application. The 16 KB SRAM can temporarily buffer small firmware chunks received via CAN, USB, USART, or an external 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 STM32F091CCT6 (256 KB Flash) provides double the storage.
What are the most typical applications for the STM32F072CBT6?
It is widely used in USB‑to‑CAN bridges, industrial CAN‑bus sensors, smart home control panels with touch buttons, automotive diagnostic tools, portable data loggers, and building 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 lowest possible power and cost, is a strong fit for the F072CBT6.