UG308: Thunderboard EFM8UB3 User's
Guide
The Thunderboard EFM8UB3 is a low cost, small form factor de-
velopment and evaluation platform for the EFM8™ Universal Bee
Microcontroller.
The Thunderboard contains an EFM8UB3 MCU together with an on-board SEGGER J-
Link debugger for easy debugging through the USB Micro-B debugging connector. All of
the EFM8 I/Os are routed to breakout pads on the sides of the board making it easy to
expand on the board features and evaluate the EFM8 Universal Bee's features with cus-
tom hardware.
TARGET DEVICE
• EFM8 Universal Bee Microcontroller
(EFM8UB31F40G-A-QFN24)
• Pipelined 8-bit C8051 core with 48 MHz
maximum operating frequency
• 40 kB flash memory and 3328 bytes RAM
• USB feature set
KIT FEATURES
• USB connectivity
• SEGGER J-Link on-board debugger
• Virtual COM port
• User RGB LED and pushbuttons
• 2.54 mm breakout pads to EFM8
• Flat flexible cable connector for external
Silicon Labs "postage-stamp" sized
boards
• Optional Mini-Simplicity connector for
Advanced Energy Monitoring using
external Silicon Labs debugger
SOFTWARE SUPPORT
• Simplicity Studio™
silabs.com
| Building a more connected world.
Rev. 1.0
