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Using the STK526
2.2.3
AT90USB82/162 Power Configuration Settings
This section applies to the following part of the power path diagram :
Figure 2-5 . MCU Power Configurations
(3V3 REG)
NOREG
INTREG
Vsource
(1)
(2)
1μF
Internal
)
3V3 100mA
Regulator
AT90USBxx2
Once the power source selected, the input of the AT90USB82/162 internal regulator
(UVcc) is powered. Firmware has the responsability to enable or disable the regulator.
Ucap is the output pin of the internal regulator, and Vcc is the core power input of the
MCU. Several cases may be required by the user :
Vsource = 5V, Vcc = 5V : for this mode, the configuration switch (see figure above)
must be in the position labelled “ NOREG ”. The MCU can still run a USB Device
application if it enables the internal regulator that will power the USB pad and macro.
Vsource = 5V, Vcc = 3.3V : for this mode, the configuration switch must be in the
position labelled “ INTREG ”. The Vcc pin will be tied to the regulator output, so that
the AT90USB82/162 itself will power itself from its regulator, and the I/O will be at
3V3 level.
Vsource = 3.3V, Vcc = 3.3V : for this mode all the MCU power inputs are at the 3V3
level. The configuration switch must be in the position “ NOREG ”. In normal operation
it is recommended to tie all the power pins together (UVcc, Vcc, Ucap) and to disable
the regulator. However, the board configuration does not allow to tie together all the
power pins, so that the regulator must be enabled by firmware in order to power the
USB pad and macro (that can lead to some extra-consumption).
Table 2-2 . MCU Power Configuration Jumpers
“3V3 REG”
Jumper position
AT90USB16 I/O power supply
Comments
View
3V3 REG
“NOREG”
“INTREG”
Primary power source
Internal regulator
This is the default configuration.
This configuration is relevant with a
5V primary powered application
requiring I/O levels at 3.3V on the
AT90USB82/162.
3V3 REG
STK526 rev. B Hardware User Guide
2-9
7709B–AVR–07/08
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