The CT25100 is a Full-Speed USB controller, which enumerates as Billboard Device. It integrates all necessary infrastructures, including the CT20101, SOF-Calibrated 48MHz USB Clock, which doesn’t need any external component, thus offering a cost-effective solution. CT25100 supports bus-powered mode and enables efficient system power management with suspend and remote wake-up signals.

CT25100 handles requests from the USB host reading the required information from a virtual address space which maps to a combination of ROM and RAM. The ROM contains Billboard specific “boilerplate” data mostly specified in the USB Device Class Definition for Billboard Devices specification; the latter contains product specific data and dynamic information.


  • USB 2.0-certified, Full-Speed (12 Mbps)
  • Supports native Billboard Device class driver
  • Integrated USB termination resistors
  • Allows the use of SRAM and ROM for storing configuration parameters
  • Billboard Device class specific descriptors
  • Clocking: Integrated 48-MHz clock oscillator
  • Supports bus-/self-powered configurations
  • USB Suspend mode for low power
  • No external crystal
  • No external components
  • Voltage and current references, test infrastructures, included


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