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Using the AT90USBKey
2.4
2.4.1
On-board Resources
USB
The AVRUSBKey is supplied with a standard USB mini A-B receptacle. The mini AB
receptacle allows to connect both a mini A plug or a mini B plug connectors.
Figure 2-5 . USB mini A-B Receptacle
J3
1-V_BUS
2-D-
3-D+
5-GND
4-ID
SHIELD
VBUS
VBUS
R2 22
R3 22
VBUS
D-
D+
GND
UCAP
VBUS
UID
USB_MiniAB
CR1
CR2
C7
1uF
R4 0
When connected to a mini B plug, the AT90USB operates as an “USB device” (the ID
pin of the plug is unconnected) and when connected to a mini A plug, the AT90USB
operates as a “USB host” (the ID pin of the A plug is tied to ground).
2.4.2
Joystick
The 4+1 ways joystick offers an easy user interface implementation for a USB
application (it can emulate mouse movements, keyboard inputs...).
Pushing the push-button causes the corresponding signal to be pulled low, while
releasing (not pressed) causes an H.Z state on the signal. The user must enable
internal pull-ups on the microcontroller input pins, removing the need for an external
pull-up resistors on the push-button.
Figure 2-6 . Joystick Schematic
PB[7..0]
SW3
1
2
Com1
Com2
Select
Lef t
Up
Right
Down
5
7
3
6
4
PB5
PB6
PB7
PE4
PE5
PE[7..0]
TPA511G
AT90USBKey Hardware User Guide
2-9
7627A–AVR–04/06
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