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POWER SUPPLY
CLOCK SOURCE
eCee PIC18F4580 Board has three power supplies; you can choose one of the following ways to
supply power :
(1) Through a Screw Terminal (7V - 20V External DC Power Supply)
(2) Through the motherboard USB port
(3) Through an adapter (7V - 20V External DC Power Supply)
The Power Supply circuit is given below:
eCee PIC18f4580 evaluation board has two clock sources:
32.768 KHz as the RTC clock source
20 MHz Crystal as the MCU clock source
Vin
1
G
N
D
2
Vout
3
U3
LM7805
D-
1
VCC
2
D+
3
GND
4
K1
USB
1
2
3
K2
POWER SELECTION
+5
D9
1N4007
1
2
K3
CONN 2PIN
C9
470MF/40V
C5
0.1MF
C6
0.1MF
C10
47
M
F
/1
6
V
R43
470R
D10
PWR LED
J1
DC POWER
+12V
DC
USB
DC
