The Sunman USB-I2C-FM board is a multifunction eval board and debug tool.


USB to I2C

  • Type B USB connector
  • 10-Pin shrouded header with AARDVARK compatible pinout
  • 3.3V, 100KHz, I2C Bus
  • 10-Pin shrouded header with 8, 3.3V GPIO lines
  • Powered from USB
  • AT90USB646, USB to I2C is programmable via USB or Atmel JTAGICE, 10-Pin shrouded header
  • Reset and Bootloader push button switches

I2C to FM Transmitter/Reciever

  • SN761633 FM Stereo/Mono Transmitter Receiver IC
  • Adjustable output power to +4dBm
  • RSSI with 2dB resolution
  • 87.387MHz to 108.113MHz Frequency range
  • 32.768KHz crystal oscillator frequency reference
  • Standard 3.5mm, stereo, audio jacks for line in and line out


  • C# GUI for reading/writing all chip registers
  • Source code provided (Visual Studio 2011 Project)
  • C source for AT90USB646 USB to I2C provided (Eclipse/GNU AVR)

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