Item specifics
Description
The STM32F071VBT6 is a mainstream Arm Cortex-M0 access line MCU from STMicroelectronics, LQFP-100 package (14×14×1.4 mm). 48 MHz Cortex-M0 core, 128 KB Flash, 16 KB SRAM (HW parity). Integrates 12-bit ADC (16 channels, 1.0 μs), 12-bit DAC (2 channels), 2 analog comparators, HDMI CEC, up to 24-channel capacitive touch, 7-channel DMA, calendar RTC (VBAT backup), 12 timers (1×16-bit advanced-control/6-ch PWM, 1×32-bit GP, 7×16-bit GP/IC/OC/IR decode, independent/window WDG, SysTick), up to 2×I2C (1 Mbit/s Fast Mode Plus, 20 mA sink), up to 4×USART (2×ISO7816/LIN/IrDA/auto baud/wakeup), up to 2×SPI (18 Mbit/s, I2S mux). 87 I/Os (up to 68 5 V-tolerant, 19 independent VDDIO2). VDD 2.0 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.[reference:24][reference:25]
Core: Arm Cortex-M0 48 MHz, NVIC, SWD, 96-bit unique ID Memory: 128 KB Flash, 16 KB SRAM (HW parity), CRC 12-bit ADC: 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, fast low-power HDMI CEC: Wakeup on header 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: Up to 2×I2C (1 Mbit/s Fast Mode Plus, 20 mA sink, SMBus/PMBus, Stop wakeup), up to 4×USART (2×ISO7816/LIN/IrDA/auto baud/wakeup), up to 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: 87 fast I/Os (up to 68 5 V-tolerant, 19 independent VDDIO2), all ext. interrupt mappable Supply/Temp: VDD 2.0 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-100 (14×14×1.4 mm), Tray
Industrial: PLCs, sensor transmitters, RS-485 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
128 KB Flash + 16 KB SRAM: For complex protocol stacks and algorithms LQFP-100 Package: 14×14 mm, 87 I/Os (68 5 V-tolerant + 19 independent VDDIO2), extremely rich I/O resources 12-bit ADC + 12-bit DAC (2-ch) + Dual Comparators: Complete analog signal chain without external analog ICs 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 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 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 + ADC + DAC + capacitive touch, ideal upgrade from 8/16-bit MCUs
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FAQ:
What is the STM32F071VBT6 and what makes it a unique 100‑pin Cortex‑M0 MCU?
The STM32F071VBT6 is a 48 MHz Arm Cortex‑M0 microcontroller with 128 KB Flash and 16 KB SRAM, housed in an LQFP‑100 package. It stands out in the STM32F0 series by offering a large number of I/O pins (up to 87) along with a 12‑bit DAC, capacitive touch‑sensing channels, and an HDMI CEC controller. Unlike its siblings in the F072 line, it does not include USB or CAN, making it a cost‑optimized choice for applications that require many GPIOs, analog output, and modern display connectivity without the overhead of communication‑specific peripherals.
How does the STM32F071VBT6 differ from the STM32F103VBT6? When should I pick the F071?
The STM32F103VBT6 is a 72 MHz Cortex‑M3 with FSMC, USB, and CAN, plus larger SRAM (20 KB). The STM32F071VBT6 sacrifices USB, CAN, FSMC, and some CPU speed, but adds a built‑in DAC, capacitive touch‑sensing channels, and an HDMI CEC controller. It also consumes significantly less power. Choose the F071VBT6 when your design needs a high I/O count, analog voltage output, or a modern touch and HDMI‑CEC interface, and you do not require USB or CAN. It delivers a rich set of peripherals for display‑centric and industrial control applications at a lower cost and power budget than an M3.
How does the STM32F071VBT6 compare to the STM32F072VBT6? Why would I choose the F071 over the F072?
Both share the same Cortex‑M0 core, 128 KB Flash, 16 KB SRAM, DAC, and touch‑sensing channels in an LQFP‑100 package. The F072VBT6 adds a CAN 2.0B controller and a USB 2.0 full‑speed device with a Clock Recovery System (CRS) for crystal‑less USB. The F071VBT6 removes CAN and USB but adds an HDMI CEC (Consumer Electronics Control) interface. Choose the F071 when your design needs HDMI CEC—for example, in set‑top boxes, TVs, or monitors—and does not require USB or CAN. If you need USB or CAN, the F072 is the better fit.
What is HDMI CEC and how can the STM32F071VBT6 use it?
HDMI CEC (Consumer Electronics Control) is a single‑wire bus integrated into the HDMI standard that allows interconnected devices—such as TVs, set‑top boxes, and media players—to control each other. The STM32F071VBT6 includes a dedicated HDMI CEC controller that handles the low‑level timing and protocol, making it easy to implement features like one‑touch play, system standby, and remote control pass‑through. This makes the F071VBT6 a popular choice for HDMI‑connected embedded devices, digital signage, and home entertainment products that need to interact with consumer AV equipment without adding an external CEC microcontroller.
Is 128 KB Flash and 16 KB SRAM enough for a complex application with touch sensing and a graphical display?
Absolutely. 128 KB of Flash provides ample space for a real‑time OS, a touch‑sensing library (STMTouch), a graphical framework for a small display, and application logic. 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 HMI panels, home automation controllers, and appliance user interfaces run comfortably within this memory envelope. If your firmware later grows, the pin‑compatible STM32F103VBT6 (128 KB Flash, 20 KB SRAM) or other F1 variants can provide an upgrade path.
Can the STM32F071VBT6 implement capacitive touch buttons and sliders without extra ICs?
Yes, it supports up to 24 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 industrial control panels, home appliances, and consumer interfaces. ST provides the free STMTouch library to simplify firmware development and tuning.
What low‑power modes does the STM32F071VBT6 support, and is it suitable for battery‑powered devices?
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 external interrupts, UART activity, or timer events. The 48 MHz Cortex‑M0 core is inherently power‑efficient, making the F071VBT6 an excellent choice for battery‑powered industrial sensors, portable instruments, and energy‑harvesting devices that spend most of their time in deep sleep and wake periodically to acquire and transmit data.
How does the STM32F071VBT6 differ from the STM32F071RBT6? When should I pick the 100‑pin VBT6?
Both share the same core, 128 KB Flash, 16 KB SRAM, DAC, TSC, and HDMI CEC. The only difference is the package: the VBT6 is an LQFP‑100 with up to 87 I/Os, while the RBT6 is an LQFP‑64 with up to 52 I/Os. Choose the VBT6 when your design needs a large number of I/O pins for connecting multiple sensors, actuators, a keypad, or a parallel display. The RBT6 is better for compact designs where 52 I/Os are sufficient.
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 USART, SPI, 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, consider the pin‑compatible STM32F103VBT6 (128 KB Flash, 20 KB SRAM) or higher‑density F0/F1 variants.
What are the most typical applications for the STM32F071VBT6?
It is widely used in HDMI‑CEC enabled devices (set‑top boxes, media players, monitors), industrial HMI panels with touch keys, home appliance controllers, smart sensors with analog output, building automation nodes, and any embedded system that needs a proven 32‑bit core with a high I/O count, DAC, touch‑sensing, and HDMI‑CEC, all at a low power and cost. Its rich peripheral mix in a 100‑pin package makes it a versatile workhorse for display‑centric and control‑oriented designs that do not require USB or CAN.