2. Board Description
The Type-C reference design board is a platform for developing and evaluating hub and dongle Type-C solutions. The board contains
Power Delivery (PD) controllers, Billboard devices, and Alternate Mode functionality. The PD Controller is implemented with EFM8 Busy
Bee 3 (EFM8BB3) MCU, and takes advantage of the feature-rich peripherals available on-chip. The only necessary external circuits are
the CC lines voltage clamps for Dead-Battery, the slew rate control capacitors, and a Pull-Up (Rp) switch for Power Role SWAP func-
tion and DRP support. The board also contains a Billboard device implemented with the EFM8 Universal Bee 1 (EFM8UB1) MCU and
allows for Alternate Mode to be used and sent through the Type-C port. For debugging and communication purposes, a USB-to-Quad
UART Bridge Controller (CP2108) is used to print debug messages from all MCUs to a USB host serial terminal. Most of the available
GPIOs from each MCU are routed to pin headers for convenient interfacing with instrumentation and/or system-level integration. The
C2 debug interface for each MCU is also routed to headers so that individual firmware can be loaded onto each device.
UG233: USB Type-C Reference Design User's Guide
Board Description
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