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