The Universal Bee family of EFM8 Microcontrollers (MCUs) is ideal for space constrained USB applications. EFM8 Universal Bee MCUs operate at up to 50 MHz and the family includes devices wtih a low power USB peripheral interface, charger detect circuit, 8 kV ESD protection and enhanced high-speed communication interfaces.


  • Pipelined 8-bit C8051 core with 50 MHz maximum operating frequency
  • Up to 22 multifunction, 5 V tolerant I/O pins
  • Low Energy USB with full- and low-speed support saves 60% of the USB energy
  • USB charger detect circuit (USB-BCS 1.2 compliant)
  • One 12-bit ADC and two analog comparators with internal voltage DAC as reference input
  • Five 16-bit timers
  • Two UARTs, SPI, SMBus/I2C master/slave and I2C slave
  • Priority crossbar for flexible pin mapping

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