EFM8 Universal Bee Family
EFM8UB2 Data Sheet
The EFM8UB2, part of the Universal Bee family of MCUs, is a
multi-purpose line of 8-bit microcontrollers with USB feature set.
KEY FEATURES
• Pipelined 8-bit 8051 MCU Core with 48
MHz maximum operating frequency
These devices offer high value by integrating a USB peripheral interface with a high pre-
cision oscillator, clock recovery circuit, and integrated transceiver, making them ideal for
any full speed USB applications with no external components required. With an efficient
8051 core and precision analog, the EFM8UB2 family is also optimal for embedded ap-
plications.
• Up to 40 multifunction I/O pins
• Crystal-less full speed/low speed USB 2.0
compliant controller with 1 KB buffer
memory
• One differential 10-bit ADC and two analog
comparators
EFM8UB2 applications include the following:
• Consumer electronics
• USB I/O controls, dongles
• Internal 48 MHz oscillator with ±0.25%
accuracy with USB clock recovery supports
crystal-free USB and UART operation
• Medical equipment
• High-speed communication bridge
• 2 UARTs, SPI, 2 SMBus/I2C serial
communications
Core / Memory
Clock Management
Energy Management
High Frequency
48 MHz RC
Oscillator
CIP-51 8051 Core
(48 MHz)
External
Oscillator
Internal LDO
Power-On Reset
Regulator
Flash Program
Memory
(up to 64 KB)
RAM Memory
(up to 4352 bytes)
Debug Interface
with C2
Low Frequency
RC Oscillator
Brown-Out
Detector
5 V-to 3.3 V LDO
Regulator
8-bit SFR bus
Serial Interfaces
I/O Ports
Timers and Triggers
Analog Interfaces
External
Interrupts
Comparator 0
2 x UART
SPI
Pin Reset
6 x Timers
PCA/PWM
ADC
Internal
Voltage
Reference
2 x I2C /
SMBus
Comparator 1
USB
General Purpose I/O
Watchdog Timer
Lowest power mode with peripheral operational:
Normal Idle Suspend
Shutdown
silabs.com | Smart. Connected. Energy-friendly.
Rev. 1.2