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Using the STK526
2.2.2
Power Source Setting
Table 2-1 . Power Supply (1) Setting
Vcc Source
Jumper position
VCC power
supply value
Comments
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VCC
This is the default configuration.
This should be used for a typical USB
Reg 5
Source
VBUS
VBUS
(4,8V to 5.2V)
device “bus powered” application.
In this mode, the STK526 is powered
directly from the USB bus, and no
other external power supply is
Reg 3.3
VBUS 5
required.
STK
This configuration can be used for a
USB “self powered” device
application”.
Reg 5
VCC
Source
REG 5V
5V
To use this configuration an external
power supply must be connected to
J5 connector. The on-board 5V
regulator is used.
This configuration allows the STK526
to be used in a 3V range application.
Reg 3.3
VBUS 5
STK
VCC
Source
Reg 5
REG 3V3
3.3V
To use this configuration an external
power supply must be connected to
J5 connector. The on-board 3V3
regulator is used.
Reg 3.3
VBUS 5
STK
STK & REG 5V
Depends on
STK500 VTG
setting
This configuration allows the STK526
to be used with an STK500 board.
In this mode, the STK526 power
supply is generated and configured
according to the “VTG” parameter of
the STK500 (1).
Caution : NO external power supply
must be connected to STK526 to
Reg 5
Reg 3.3
VBUS 5
VCC
Source
avoid conflict with STK500 power
supply.
STK
2-8
7709B–AVR–07/08
Notes:
1. Caution: The STK500 has its own “ON/OFF” switch
STK526 rev. B Hardware User Guide
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