The AT90USBKey provides the following features:

• AT90USB QFN64

• AVR Studio® software interface (1)

• USB software interface for Device Firmware Upgrade (DFU bootloader) (2)

• Power supply flagged by “VCC-ON” LED:

              – regulated 3.3V
              – from an external battery connector
              – from the USB interface (USB device bus powered application)

• JTAG interface (connector not mounted):

                 – for on-chip ISP
                 – for on-chip debugging using JTAG ICE

• Serial interfaces:

                 – 1 USB full/low speed device/host/OTG interface

• On-board resources:

                – 4+1-ways joystick
                – 2 Bi-Color LEDs
                – temperature sensor
                – serial dataflash memories
                – all microcontroller I/O ports access on 2x8pin headers (not mounted)

• On-board RESET button

• On-board HWB button to force bootloader section execution at reset.

• System clock:

              – 8 MHz crystal

Notes: 1. The AVRUSBKey is supported by AVR Studio®, version 4.12 or higher. For up-to date information on this and other AVR tool products, please consult our web site. The most recent version of AVR Studio®, AVR tools and this User Guide can be found in the AVR section of the Atmel web site, http://www.atmel.com.
2. ATMEL Flip®, In System Programming Version 3 or Higher shall be used for Device  Firmware Upgrade. Please consult Atmel web site to retrieve the latex version of Flip and the DFU bootloader Hex file if needed.