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Using the STK526
2.2
Power Supply
The on-board power supply circuitry allows different power supply configurations.
Because the AT90USB82/162 contains an internal 3V3 regulator that can be used to
power an external circuitry, several power configurations are handled by the STK526.
The power path is represented by the figure below :
Figure 2-2 . STK526 Power Configuration
EXT (JACK)
5V
REG5V
3V3
REG3V3
(3V3 REG)
NOREG INTREG
VBUS
STK500
VBUS
STK
Vsource
(1)
(2)
1μF
Internal
(VCC SOURCE)
3V3 100mA
Regulator
AT90USBxx2
First, the board allows to drain power from three external sources, leading to four
different solutions. The selected voltage is applied to the regulator input of the
AT90USB82/162. Then the user can choose to power the MCU I/O either directly with
the primary power source (external 5V/3V3), or from the internal regulator itself (MCU
auto-power).
2.2.1
Power Supply Sources
The power supply can come from three different (1) sources:
USB connector,
JACK PWR connector (J5, See Figure 2-3),
STK500
USB powered: When used as a USB device bus powered application, the STK526 can be powered via
the USB VBUS power supply line.
JACK PWR connector:
2-6
7709B–AVR–07/08
– Use the JACK outlet provided with the kit (See Figure 2-4)
– Input supply from 9 up to 15V (2) DC,
– No specific polarization (3) is required.
STK526 rev. B Hardware User Guide
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