The AEC-Q100-qualified, ultra-low-power EFM8SB1 Sleepy Bee family provides on-chip capacitive touch technology enabling replacement of physical buttons with touch control. The EFM8BB1/BB2 Busy Bee family features high-performance analogue and digital peripherals, aimed at applications such as controlling motorized rear view mirrors, headlights and seats.
All EFM8 MCUs are 8-bit devices based on a high-speed pipelined 8051 core, ultra-low power, precision analogue and enhanced communication peripherals, on-chip oscillators, small-footprint packages, and a crossbar architecture that enables flexible digital and analogue peripheral multiplexing to simplify PCB design and I/O pin routing.
EFM8SB Sleepy Bee MCUs are Silicon Labs’ most energy-friendly 8-bit devices offering touch performance, ultra-low sleep-mode power (50 nA with full memory retention and brown-out detection) and fast 2 µsec wake-up time. The automotive-grade EFM8SB1devices support -40 to +85C ambient temperatures, core speeds up to 25 MHz and flash sizes up to 8 kB. The MCUs integrate a 12-bit analogue-to-digital converter (ADC), high-performance timers, a temperature sensor, and enhanced SPI, I ²C and UART serial ports. An on-chip high-resolution capacitive-to-digital converter (CDC) offers an ultra-low <1 µA wake-on-touch capability and 12 capacitive touch channels, eliminating the need for on/off switches in many applications. The MCUs are suitable for touch-based controls such as dome lights and overhead buttons. Silicon Labs supports touch-sense interface design with its Capacitive Sense Library available within the Simplicity Studio development tool suite.
EFM8BB1/BB2 Busy Bee MCUs provide a balance of performance, energy efficiency and value for cost-sensitive applications. With core speeds scaling up to 50 MHz and 2-64 kB flash sizes, the MCUs offer an array of high-performance peripherals including a high-resolution 12-bit ADC, high-speed 12-bit DACs, low-power comparators, voltage reference, enhanced-throughput communication peripherals and internal oscillators in packages down to 3 x 3 mm. They support an extended temperature range of -40 to +125C. The EFM8BB1 devices offer best price/performance for cost-sensitive designs, while the BB2 products deliver enhanced analogue and digital peripheral