EFM8UB20F64G-A-QFP32 microcontroller by Silicon Labs. Features: 8-Bit MCU 54K flash memory, 2 x UART, USB, 10-Bit ADC, Revision: A Package: Surface Mount QFP32 Download Silicon Labs EEFM8UB20F64G-A-QFP32 .pdf datasheet: Status: NEW RoHS compliant: YES