Item specifics
Description
The STM32F070CBT6 is a mainstream Arm Cortex-M0 value line MCU from STMicroelectronics, LQFP-48 package (7×7×1.4 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, 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). 37 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 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: 37 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-48 (7×7×1.4 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 USB 2.0 FS Device: BCD and LPM support, no external USB controller needed 12-bit High-Speed ADC: 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 37 I/Os: All 5 V-tolerant, rich resources in LQFP-48 package Calendar RTC: Alarm/periodic wakeup Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/development boards Cost-Effective: 32-bit ARM + 128 KB Flash + USB, ideal upgrade from 8/16-bit MCUs
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FAQ:
What is the STM32F070CBT6 and why is it the sweet spot in the STM32F0 Value Line?
The STM32F070CBT6 is a 48 MHz Arm Cortex‑M0 microcontroller with 128 KB Flash and 16 KB SRAM, housed in an LQFP‑48 package. It sits at the ideal intersection of memory capacity, I/O count, and cost within the F0 “Value Line.” It provides generous Flash for complex firmware, an HDMI CEC controller, a 12‑bit ADC, and standard serial interfaces (USART, SPI, I2C) while intentionally omitting USB, CAN, and a DAC to keep the price as low as possible. This makes it the go‑to choice for high‑volume, cost‑sensitive products that need a proven 32‑bit core and HDMI connectivity without paying for unused peripherals.
How does the STM32F070CBT6 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, USB, and CAN. The STM32F070CBT6 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 F070CBT6 when your design needs generous code storage, HDMI connectivity, and extremely low power at the 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 STM32F070CBT6 differ from the STM32F070RBT6? When should I pick the 48‑pin C8T6?
Both share the same core, 128 KB Flash, 16 KB SRAM, HDMI CEC, and identical peripherals. 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 F070 line while saving valuable PCB area and cost. The RBT6 is better if you need additional GPIOs for more sensors, actuators, or a wider parallel interface.
Why would I choose the STM32F070CBT6 over the STM32F071CBT6? What do I sacrifice?
The STM32F071CBT6 adds a 12‑bit DAC and capacitive touch‑sensing channels to the same 48‑pin, 128 KB Flash platform. The F070CBT6 removes the DAC and touch sensing to achieve an even lower price point. Choose the F070CBT6 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, generous Flash, and a rich set of serial interfaces.
Is 128 KB Flash and 16 KB SRAM enough for a complex real‑time application? What can I fit in this space?
Absolutely. 128 KB of Flash provides generous space for a real‑time OS, communication stacks (USART, SPI, I2C), sensor drivers, and application logic—often with room left for future over‑the‑air 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 your firmware later grows, the pin‑compatible STM32F071CBT6 (also 128 KB Flash) offers an upgrade path with additional touch‑sensing or DAC features, though it does not increase SRAM.
What is HDMI CEC and how can the STM32F070CBT6 use it? Is it valuable without USB or CAN?
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 STM32F070CBT6 includes a dedicated HDMI CEC controller that handles the low‑level timing and protocol, making it easy to implement one‑touch play, system standby, and remote control pass‑through. Even without USB or CAN, this is highly valuable in HDMI‑connected embedded devices such as digital signage, projectors, and home entertainment systems, where the F070CBT6 can serve as a compact, low‑cost CEC bridge or interface controller, translating commands to UART, SPI, or I2C for the main processor.
What low‑power modes does the STM32F070CBT6 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 F070CBT6 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.
How many communication interfaces can I use simultaneously on the LQFP‑48 package? Will I run out of pins?
With up to 37 I/O pins, you can typically allocate 3× USART, 2× SPI, 2× I2C, the HDMI CEC line, and still have several pins left for ADC input or GPIO. The flexible pin‑multiplexing of the STM32F0 series helps you maximize the use of every pin. STM32CubeMX is essential for verifying the exact pin‑out and ensuring no conflicts. For most communication‑focused designs, the 48‑pin package provides a comfortable number of I/Os without forcing you to move to a larger 64‑pin footprint.
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 STM32F071CBT6 (128 KB Flash with additional features) or the higher‑density STM32F091CCT6 (256 KB Flash) as potential future upgrades.
What are the most typical applications for the STM32F070CBT6?
It is widely used in HDMI‑CEC enabled devices (set‑top boxes, media players, monitors), home appliances, 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, HDMI connectivity, and a compact 48‑pin footprint at the absolute lowest cost is a strong fit for the F070CBT6. Its optimal memory configuration and Value Line pricing make it a top choice for transitioning 8‑bit designs into the 32‑bit era without exceeding tight bill‑of‑material constraints.