ST: 8-bit MCUs with rich analog and DMA in low-cost SO-8 package

STMicroelectronics is boosting feature integration in low-cost, low-power 8-bit microcontrollers with the new STM8L050. As the latest in the ultra-energy-conscious STM8L series, it embeds rich analog peripherals, a DMA controller, and separated data EEPROM, all in an inexpensive SO-8 package with up to six user I/Os. Leveraging ST’s powerful, efficient STM8 core running at up to 16 MHz, the STM8L050 delivers economy and performance for resource-constrained products like industrial sensors, toys, access cards, e-bike controllers, home-automation or lighting products, smart printer cartridges, or battery chargers.

The integrated DMA (Direct Memory Access) controller speeds application performance by streamlining data transfers between peripherals and memory, or from memory to memory, ultimately saving power consumption. The 256 bytes of separated EEPROM allows applications to store important program data when the MCU is powered down, while allowing maximum utilization of Flash for code storage.

Alongside two comparators, the STM8L050 has a 4-channel 12-bit analog-digital converter (ADC) and a low-power real-time clock with programmable alarm and periodic wakeups, allowing designers to minimize external analog components. In addition, support for either an external or internal clock at up to 16MHz further enhances flexibility to balance performance with bill-of-materials savings.

Other features include 8Kbytes of on-chip Flash memory, 1Kbyte of RAM, two 16-bit timers, one 8-bit timer, and popular connectivity and debug interfaces including SPI, I2C, UART, and SWIM.

As an STM8L device leveraging ST’s ultra-low-power technologies, the STM8L050 provides power-saving modes that cut current to as little as 350nA, and operates over a wide voltage range from 3.6V down to 1.8V. The MCUs are fully specified from -40 to 125°C, ensuring robustness and reliability in demanding applications such as industrial controls or lighting products.

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