Product Overview The EFM8UB1 is part of the general-purpose Bee series MCUs, a family of small-package, multi-purpose 8-bit microcontrollers with a USB functional set. These devices provide high value by integrating an innovative low-power USB peripheral interface, charge detection circuitry, 8 kV ESD protection, and an enhanced high-speed communication interface into a small package, making them an ideal choice for space-constrained USB applications. With an efficient 8051 core and precise analog features, the EFM8UB1 series is also well-suited for embedded applications. EFM8UB1 applications include: USB I/O control, dongles Consumer electronics High-speed communication bridges Medical devices Key features include: Pipelined 8-bit C8051 core with a maximum operating frequency of 50 MHz Up to 22 multi-function, 5 V tolerant I/O pins Low-power USB, supporting full-speed and low-speed modes, saving up to 90% of USB power consumption USB charge detection circuitry (compliant with USB-BCS 1.2 standard) One 12-bit ADC and two analog comparators with internal voltage DAC as reference input Five 16-bit timers Two UART, SPI, SMBus/I2C master/slave, and I2C slave Priority crossbar for flexible pin mapping Application Areas USB input/output control, dongles Consumer electronics High-speed communication bridging Medical devices