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Using the STK525
2.2.2
Power Supply Setting
Table 2-1 . Power Supply (1) Setting
Vcc Source
Jumper position
VCC power
supply value
Comments
View
VCC
This is the default configuration.
This should be used for a typical USB
Reg 5
Source
VBUS 5
VBUS
(4,7V to 5.0V)
device “bus powered” application.
In this mode, the STK525 is powered
directly from the USB bus, and no
other external power supply is
Reg 3.3
VBUS 5
required.
STK
VCC
This configuration can be used for a
USB “self powered” device
application” or when operating has a
Reg 5
Source
REG 5
5V
USB host.
Reg 3.3
To use this configuration an external
power supply must be connected to
VBUS 5
J6 connector.
STK
This configuration allows the STK525
to be used in a 3V range application.
This configuration can be used with
both device or host mode USB
Reg 5
VCC
Source
REG 3.3
3.3V
applications.
Reg 3.3
To use this configuration an external
power supply must be connected to
VBUS 5
J6 connector.
STK
VCC
STK
Depends on
STK500 VTG
setting
This configuration allows the STK525
to be used with an STK500 board.
In this mode, the STK525 power
supply is generated and configured
according to the “VTG” parameter of
the STK500 (1).
Reg 5
Reg 3.3
VBUS 5
Source
STK
2-8
7608A–AVR–04/06
Notes:
1. Caution: The STK500 has its own “ON/OFF” switch
STK525 Hardware User Guide
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