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Using the STK525
2.2.3
VBUS Generator Setting
When using the AT90USBxxx microcontroller in USB host mode. The STK525 should
provide a 5V power supply over the VBUS pin of its USB mini AB connector.
A couple of transistors on the STK525 allows the UVCON pin of the AT90USBxxx to
control the VBUS generation (See Figure 2-4). In this mode the STK525 is powered by
external power supply source (J6 or STK500 expand0/1 connectors). JP7 allows to
select the 5V source used by the VBUS generator.
Figure 2-4 . VBUS generator schematic
JP7
VTG
1
FDV304P/FAI
STK
Ext
3
2
VBUS gen
R32
10k
M1
VBUS
R33
UVCON
Q2
BC847B
-
C34
4.7uF
100k
Table 2-2 . VBUS Generator Setting
“Vbus Gen”
Jumper position
STK525 power supply
Comments
View
Vbus
This is the default configuration.
Gen
“Ext”
External power supply from J6
The VBUS generator source is the
on-board 5V regulator.
“Stk”
External power supply from
Expand0/1 (connected to a STK500)
The VBUS generator source is the
STK500.
Note:
The “Vtarget” setting of STK500
Vbus
Gen
should be set to “5V”.
STK525 Hardware User Guide
2-9
7608A–AVR–04/06
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