Power Supply - Atmel AT89C5131A Hardware User's Manual

Hardware Description
2.2

Power Supply

2-4
4245A–USB–11/04
The on-board power supply circuitry allows various power supply configurations.
The power source can be:
– V from USB (5V)
BUS
– V from USB (5V) through the current limiter
BUS
– 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
VBUS
Source
Regulation
PWR.S.
LIM
Direct Input
VCC
PWR.S.
LIM
5V Regulate
VCC
PWR.S.
LIM
3.3V Regulate
VCC
VBUS and
Current Limiter
PWR.S.
LIM
REG
5V 5V
VCC
3.3V 3.3V
PWR PWR
PWR.S.
LIM
REG
5V 5V
VCC
3.3V 3.3V
PWR PWR
PWR.S.
LIM
REG
5V 5V
VCC
3.3V 3.3V
PWR PWR
AT89C5131A Starter Kit Hardware User Guide
External
PWR.S.
LIM
REG REG
5V
VCC
3.3V
PWR
PWR.S.
LIM
REG REG
5V
VCC
3.3V
PWR
PWR.S.
LIM
REG REG
5V
VCC
3.3V
PWR