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