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Hardware Description
2.2
Power Supply
The on-board power supply circuitry allows various power supply configurations.
The power source can be:
–
V BUS from USB (5V)
–
V BUS from USB (5V) through the current limiter
–
External power supply (from 6 to 12V) or 9V battery
The voltage output can be the direct power source, regulated at 5V or 3.3V.
The power supply selection is performed using the JP2, JP3, JP4 and JP5 jumpers.
The power supply can be turned on/off using the “power” switch (SW6). Once the power
is established, the power LED (D9) is lit.
Figure 2-2. Different Power Configurations
Power
Source
Regulation
Direct Input
VBUS
PWR.S.
LIM
REG
VBUS and
Current Limiter
PWR.S.
LIM
REG
External
PWR.S.
LIM
REG
VCC
5V
VCC
5V
VCC
5V
PWR
PWR.S.
LIM
3.3V
PWR
PWR.S.
LIM
3.3V
PWR
PWR.S.
LIM
3.3V
5V Regulate
REG
REG
REG
VCC
5V
VCC
5V
VCC
5V
PWR
PWR.S.
LIM
3.3V
PWR
PWR.S.
LIM
3.3V
PWR
PWR.S.
LIM
3.3V
3.3V Regulate
REG
REG
REG
VCC
5V
VCC
5V
VCC
5V
PWR
3.3V
PWR
3.3V
PWR
3.3V
2-4
4245A–USB–11/04
AT89C5131A Starter Kit Hardware User Guide
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