Item specifics
Description
The STM32F070RBT6 is a mainstream Arm Cortex-M0 value line MCU from STMicroelectronics, LQFP-64 package (10×10×1.4 mm). 48 MHz Cortex-M0 core, 128 KB Flash, 16 KB SRAM (HW parity). Integrates USB 2.0 FS device, 12-bit ADC (up to 16 channels, 1.0 μs), 5-channel DMA, calendar RTC with alarm and periodic wakeup, CRC, up to 11 timers (1×16-bit advanced-control/6-ch PWM, up to 7×16-bit GP/IC/OC/IR decode, independent/window WDG, SysTick), up to 2×I2C, up to 4×USART (1×ISO7816/LIN/IrDA/auto baud/wakeup), up to 2×SPI (18 Mbit/s). 51 I/Os (all 5 V-tolerant). VDD 2.4 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: 128 KB Flash, 16 KB SRAM (HW parity), CRC USB 2.0 FS: BCD and LPM support 12-bit ADC: Up to 16 channels, 1.0 μs, 0–3.6 V, analog supply 2.4 V–3.6 V 5-ch DMA: Flexible mapping Up to 11 Timers: 1×16-bit advanced-control (6-ch PWM), up to 7×16-bit GP (IC/OC/IR decode), independent/window WDG, SysTick Communication: Up to 2×I2C, up to 4×USART (1×ISO7816/LIN/IrDA/auto baud/wakeup), up to 2×SPI (18 Mbit/s, 4–16 bit frames) Calendar RTC: Alarm and periodic wakeup Low Power: Sleep/Stop/Standby Clock: 4–32 MHz XTAL, 32 kHz RTC XTAL (calibrated), 8 MHz RC (×6 PLL), 40 kHz RC I/Os: 51 fast I/Os, all 5 V-tolerant, all ext. interrupt mappable Reliability: POR/PDR, SWD Supply/Temp: VDD 2.4 V–3.6 V, VDDA 2.4 V–3.6 V, -40 °C to 85 °C Package: LQFP-64 (10×10×1.4 mm), Tray
Industrial: PLCs, sensor transmitters, RS-485 nodes, inverters Motor Control: Fans, pumps, small motors (6-ch PWM) Consumer: Remote controls, toys, handhelds, PC peripherals Home Appliances: Panels, HVAC, alarms, smart lighting IoT: Wireless sensors, environmental monitoring, smart home LED Lighting: Dimming, RGB strips, SMPS A/V Equipment: A/V receivers, digital TV Security: Access control, alarms, smoke detectors
128 KB Flash + 16 KB SRAM: Among the largest memory configurations in the STM32F0 value line for complex protocol stacks and algorithms LQFP-64 Package: 10×10 mm, 51 I/Os (all 5 V-tolerant), extremely rich I/O resources USB 2.0 FS Device: BCD and LPM support, no external USB controller needed 12-bit High-Speed ADC: Up to 16 channels, 1.0 μs, separate analog supply Up to 4 USARTs: Rare in this class, meeting multi-bus communication needs 11 Timers: Advanced-control/PWM + 7 GP/IR decode + watchdogs 5-ch DMA: Direct peripheral-to-memory transfers, offloads CPU Calendar RTC: Alarm/periodic wakeup Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/development boards (official NUCLEO-F070RB features this MCU) Cost-Effective: 32-bit ARM + 128 KB Flash + USB + 51 I/Os, ideal upgrade from 8/16-bit MCUs
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FAQ:
What is the STM32F070RBT6 and why is it called a "Value Line" MCU?
The STM32F070RBT6 is a 48 MHz Arm Cortex‑M0 microcontroller with 128 KB Flash and 16 KB SRAM, housed in an LQFP‑64 package. It belongs to the STM32F0 "Value Line," which is specifically designed to bring 32‑bit processing power to cost‑sensitive applications previously dominated by 8‑ or 16‑bit MCUs. Compared to the mainstream STM32F1 series, it optimizes for low cost and low power by removing USB, CAN, and DAC peripherals while retaining essential communication interfaces (USART, SPI, I2C), a 12‑bit ADC, and an HDMI CEC controller. This makes it an ideal entry‑level upgrade from legacy 8‑bit designs.
How does the STM32F070RBT6 differ from the popular STM32F103C8T6? What are the main trade‑offs?
The STM32F103C8T6 is a 72 MHz Cortex‑M3 with 64 KB Flash, 20 KB SRAM, USB, and CAN. The STM32F070RBT6 runs at a lower 48 MHz and uses a simpler Cortex‑M0 core, but provides double the Flash (128 KB), an HDMI CEC controller, and significantly lower power consumption. It lacks USB and CAN. Choose the F070RBT6 when your design needs generous code storage, HDMI connectivity, and low power at the absolute minimum cost, and you do not require USB or CAN. The F103 is better if you need the extra CPU speed, USB, or CAN communication.
How does the STM32F070RBT6 compare to the STM32F071RBT6? Why would I choose the F070?
Both share the same Cortex‑M0 core, 128 KB Flash, 16 KB SRAM, and LQFP‑64 package. The F071RBT6 adds a 12‑bit DAC and capacitive touch‑sensing channels. The F070RBT6 removes the DAC and touch sensing to achieve an even lower price point. Choose the F070RBT6 when your application does not need analog voltage output or capacitive touch keys, and your primary goal is to minimize system cost while retaining HDMI CEC and a rich set of serial interfaces.
Is 128 KB Flash and 16 KB SRAM enough for a real‑time control application? What can I fit in this space?
Absolutely. 128 KB of Flash provides generous space for sensor drivers, communication stacks (USART, SPI, I2C), and control logic—often with room left for future updates. The 16 KB SRAM requires careful buffer management—using DMA for serial transfers and keeping large arrays in Flash—but is sufficient for task stacks and communication buffers in many proven designs such as motor controllers, home automation nodes, and industrial timers. If you later need more SRAM, the pin‑compatible STM32F103RBT6 (20 KB SRAM) or STM32F071RBT6 (same 16 KB) offer potential upgrade paths.
Is 48 MHz fast enough for real‑time control and serial communication? Will I miss the 72 MHz of an F103?
For most real‑world applications, 48 MHz is more than adequate. It can easily handle UART, SPI, and I2C communication at standard baud rates, perform ADC sampling at several hundred ksps, and run simple PID control loops. The Cortex‑M0 core at 48 MHz still outperforms most 8‑ and 16‑bit MCUs. You will only feel the speed limitation if you need to process complex algorithms or execute high‑speed DSP. For everything else, the F070RBT6 delivers a responsive, real‑time experience with lower power consumption and lower cost than a 72 MHz F103.
What is HDMI CEC and how does the STM32F070RBT6 use it? Is it useful without USB?
HDMI CEC (Consumer Electronics Control) is a single‑wire bus that allows interconnected HDMI devices—such as TVs, set‑top boxes, and media players—to control each other. The STM32F070RBT6 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 is particularly valuable in HDMI‑connected embedded devices, even without USB, where the chip can serve as a CEC bridge or interface controller in digital signage, projectors, and home entertainment systems.
How does the STM32F070RBT6 compare to the STM32F030R8T6 or STM32F051R8T6? Is it a good upgrade?
The STM32F030R8T6 and STM32F051R8T6 are also Cortex‑M0 MCUs with 64 KB Flash and 8 KB SRAM. The STM32F070RBT6 doubles both the Flash (128 KB) and SRAM (16 KB), adds an HDMI CEC controller, and provides more communication peripherals. It is a direct upgrade for designs that have outgrown the F030 or F051 memory limits. The pin‑out is largely compatible within the LQFP‑64 package, making migration straightforward with minimal PCB changes.
What low‑power modes does the STM32F070RBT6 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 or UART activity. The 48 MHz Cortex‑M0 core is inherently power‑efficient, making the F070RBT6 an excellent choice for battery‑powered sensors, portable instruments, and energy‑harvesting devices that spend most of their time in deep sleep and wake periodically to acquire and transmit data.
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, the pin‑compatible STM32F103RBT6 (128 KB Flash, 20 KB SRAM) provides a larger buffer, though it lacks the HDMI CEC of the F070.
What are the most typical applications for the STM32F070RBT6?
It is widely used in HDMI‑CEC enabled devices, home appliances, simple motor drives, smart sensors, power tools, building automation controllers, and cost‑sensitive industrial nodes. Any embedded system that needs a proven 32‑bit core with generous Flash, basic serial communication, HDMI connectivity, and a compact 64‑pin footprint at the lowest possible cost is a strong fit for the F070RBT6. Its Value Line positioning makes it a perennial favorite for high‑volume, price‑conscious products transitioning from 8‑bit to 32‑bit architectures.