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Using the AT90USBKey
2.2.2
VBUS Generator
When using the AT90USB microcontroller in USB host mode, the AT90USBKey should
provide a 5V power supply over the VBUS pin of its USB mini AB connector.
A couple of transistors allows the UVCON pin of the AT90USB to control the VBUS
generation (See Figure 2-3). In this mode the AT90USBKey is powered by external
battery power supply source.
Figure 2-3 . VBUS generator schematic
FDV304P/FAI
5V
R25
R24
10k
M1
VBUS
UVCON
Q1
BC847B
-
C19
4.7uF
100k
2.2.3
“POWER-ON“ LED
The POWER-ON LED (“D1”) is always lit when power is applied to AVRUSBKey
regardless of the power supply source.
AT90USBKey Hardware User Guide
2-7
7627A–AVR–04/06
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