User manual

Introduction
1-4 AT90USBKey Hardware User Guide
7627A–AVR–04/06
1.2 AT90USBKey Features
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 (for reduced host or OTG operation)
– 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.