Item specifics
Description
The STM32F051K8T6 is a mainstream Arm Cortex-M0 access line MCU from STMicroelectronics, LQFP-32 package (7×7×1.4 mm). 48 MHz Cortex-M0 core, 64 KB Flash, 8 KB SRAM. Integrates 12-bit ADC (up to 13 channels, 1.0 μs), 12-bit DAC, 2 analog comparators, HDMI CEC, 5-channel DMA, up to 18-channel capacitive touch, calendar RTC (VBAT backup), up to 11 timers (1×16-bit 7-channel advanced-control/6-ch PWM/deadtime/emergency stop, 1×32-bit GP/IC/OC/IR decode, 5×16-bit GP, independent/window WDG, SysTick), up to 2×I2C (1×1 Mbit/s Fast Mode Plus, 20 mA sink), up to 2×USART (1×ISO7816/LIN/IrDA/auto baud/wakeup), 1×SPI (18 Mbit/s, I2S mux). 25 I/Os. VDD 2.0 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: 64 KB Flash, 8 KB SRAM (HW parity), CRC 12-bit ADC: Up to 13 channels (10 ext. + 3 int.), 1.0 μs, 0–3.6 V, analog supply 2.4 V–3.6 V 12-bit DAC: 1 channel, buffered output 2 Analog Comparators: Programmable input/output HDMI CEC: Wakeup on header 18-ch Capacitive Touch: Keys/linear/rotary 5-ch DMA: Flexible mapping Up to 11 Timers: 1×16-bit 7-ch advanced-control (6-ch PWM/deadtime/emergency stop), 1×32-bit GP (4 IC/OC/IR decode), 5×16-bit GP, independent/window WDG, SysTick Communication: Up to 2×I2C (1×1 Mbit/s Fast Mode Plus, SMBus/PMBus, 20 mA sink, Stop wakeup), up to 2×USART (master sync SPI/modem, 1×ISO7816/LIN/IrDA/auto baud/wakeup), 1×SPI (18 Mbit/s, I2S mux) 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: 25 fast I/Os, all ext. interrupt mappable Reliability: POR/PDR, PVD, SWD, 96-bit unique ID Supply/Temp: VDD 2.0 V–3.6 V, VDDA 2.4 V–3.6 V, -40 °C to 85 °C Package: LQFP-32 (7×7×1.4 mm), Tray
Consumer: Remote controls, toothbrushes, toys, handhelds, PC peripherals Industrial: PLCs, sensor transmitters, RS-485 nodes, inverters Motor Control: Fans, pumps, small motors (6-ch PWM/deadtime/emergency stop) Automotive: Light/window control, sensor nodes Home Appliances: Panels, HVAC, alarms, smart lighting IoT: Wireless sensors, environmental monitoring, smart home LED Lighting: Dimming, RGB strips, SMPS HMI: Touch keys/sliders/wheels
LQFP-32 Package: 7×7 mm, 25 I/Os, hand-soldering friendly 64 KB Flash + 8 KB SRAM: Balanced configuration for medium-complexity applications 12-bit ADC + DAC + Dual Comparators: Complete analog signal chain without external analog ICs 12-bit DAC: Buffered output, rare in this class, supports audio/sensor excitation/control loops 18-ch Capacitive Touch: No external touch IC needed, reduces BOM HDMI CEC: For digital TV, A/V receivers, and consumer electronics 5-ch DMA: Direct peripheral-to-memory transfers, offloads CPU I2C Fast Mode Plus: 1 Mbit/s, 20 mA sink, SMBus/PMBus 11 Timers: Advanced-control/PWM/deadtime/emergency stop + 32-bit IR decode + 5 GP 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 STM32F051K8T6 and what makes it unique in a 32‑pin LQFP package?
The STM32F051K8T6 is a 48 MHz Arm Cortex‑M0 microcontroller with 64 KB Flash and 8 KB SRAM, housed in an LQFP‑32 package. It stands out by integrating a 12‑bit DAC and an HDMI CEC controller—peripherals rarely found together in such a compact, easy‑to‑solder package. Combined with a 12‑bit ADC and standard serial interfaces (USART, SPI, I2C), it is an ideal single‑chip solution for cost‑sensitive industrial sensors, portable medical devices, and HDMI‑connected consumer electronics that need both analog output capability and digital control in a tiny footprint that is hand‑solderable for rapid prototyping.
How does the STM32F051K8T6 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 in an LQFP‑48 package. The STM32F051K8T6 runs at a lower 48 MHz and uses a simpler Cortex‑M0 core, has less SRAM (8 KB vs 20 KB), and removes USB and CAN. However, it adds a built‑in 12‑bit DAC and an HDMI CEC controller, comes in a much smaller 32‑pin LQFP package that is easier to hand‑solder, and consumes significantly less power. Choose the F051K8T6 when you need a very compact, low‑cost design with analog voltage output or HDMI connectivity, and you do not require USB, CAN, or the larger memory of the F103.
How does the STM32F051K8T6 compare to the STM32F042F6P6? Which one should I pick for a tiny USB or HDMI project?
The STM32F042F6P6 is also a 32‑pin Cortex‑M0 with 32 KB Flash and 6 KB SRAM, but it replaces the DAC and HDMI CEC with a USB 2.0 full‑speed device and a CAN 2.0B controller. The F051K8T6 doubles the Flash to 64 KB, increases SRAM to 8 KB, and includes a DAC and HDMI CEC. Choose the F051K8T6 when your design needs analog output or must interface with HDMI‑CEC devices (such as TVs or set‑top boxes). Choose the F042F6P6 when you need USB or CAN communication in a similarly tiny package.
Is 64 KB Flash and 8 KB SRAM really enough for a real‑time control application? What can I fit?
Absolutely, for focused and well‑optimized tasks. 64 KB of Flash provides comfortable space for sensor drivers, a USART/SPI/I2C communication stack, a simple control loop, and application logic—often with room left for future firmware updates. The 8 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, smart sensors, and home automation nodes. If your code later outgrows the 8 KB SRAM limit, you can consider the STM32F071K8U6 or move to a 48‑pin package for a larger memory upgrade.
What is HDMI CEC and how can the STM32F051K8T6 use it in a 32‑pin package?
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 STM32F051K8T6 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 with only 25 I/O pins, the chip can serve as a compact CEC bridge in digital signage, projectors, and home entertainment systems, translating CEC commands to UART, SPI, or I2C for the main system processor—eliminating the need for an external CEC microcontroller.
What low‑power modes does the STM32F051K8T6 support, and can it run from a coin‑cell battery?
The chip supports Sleep, Stop, and Standby modes. In Stop mode with the main regulator off and all 8 KB SRAM retained, the typical current is around 3 µA—extremely low for a 32‑bit MCU. 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 F051K8T6 an excellent choice for battery‑powered sensors, energy‑harvesting devices, and portable instruments that spend most of their time in deep sleep and wake periodically to acquire and transmit data.
How many I/O pins does the LQFP‑32 package provide, and what peripherals can I use simultaneously?
The LQFP‑32 package offers up to 25 general‑purpose I/O pins (some signals are shared with the DAC and HDMI CEC functions). With careful planning, you can allocate one USART, one SPI, one I2C, the HDMI CEC line, the two DAC outputs, and still have a few 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 in such a tightly constrained package.
How does the STM32F051K8T6 differ from the STM32F051K8U6? Why choose the LQFP over the QFN?
Electrically, the STM32F051K8T6 (LQFP‑32) and STM32F051K8U6 (UFQFPN‑32) are identical—same Flash, SRAM, and peripherals. The only difference is the package: the LQFP has exposed leads that can be drag‑soldered with a standard soldering iron and visually inspected, making it ideal for prototyping, small‑batch production, and field repairs. The QFN requires reflow soldering or a hot‑air station. Choose the K8T6 (LQFP) when you need easy hand‑soldering and visual inspection; choose the K8U6 (QFN) when you need the smallest possible PCB footprint.
Can I perform over‑the‑air (OTA) firmware updates with the 64 KB single‑bank Flash?
Yes, but with strict code‑size discipline. A minimal bootloader (4–8 KB) and a compact application must be implemented. The 8 KB SRAM can temporarily buffer very 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 the recommended method. For designs that require comfortable OTA headroom, consider the STM32F071C8T6 (128 KB Flash) or STM32F091CCT6 (256 KB Flash).
What are the most typical applications for the STM32F051K8T6?
It is widely used in compact HDMI‑CEC interface modules, smart sensors with analog output, portable medical devices, power tools, LED lighting controllers, and cost‑sensitive industrial nodes. Any space‑constrained embedded system that needs a proven 32‑bit core, a built‑in DAC, HDMI connectivity, and a tiny, easy‑to‑solder 32‑pin LQFP package at a very competitive cost is a strong fit for the F051K8T6.