Microchip Technology MCP3905A, Reference Design, Page: 18 / 24

MCP3905A/06A Energy Meter Reference Design
DS51565B-page 14
©
2009 Microchip Technology Inc.
A.3 BOARD SCHEMATIC
1
2
3
4
56
A B C D
6
5
4
3
2
1
D C B A
T
itle
N
um
ber
R
evision
Si
ze
B
D
ate:
17-Jun-2005
S
heet of
F
ile:
C
:\A
ctive B
oard F
iles\102-00031 thru 102-00040\102-00037\P
C
B
F
iles\P
rotel F
iles\0003
Dr
aw
n By:
C1
3
10uF
/6.3V
C1
1
220uF
/6.3V
C1
2
0.1uF
C1
0.033uF
C2
0.033uF
C3
0.033uF
C4 0.033uF
C1
7
0.47uF
C1
6
0.01uF
C6
0.1uF
C1
5
0.1uF C1
4
0.1uF
C
9
22pF
C
8
22pF
C7 0.1uF
C1
8
470uF
/35V
C5 10uF
/6.3V
D3
1N
4744A
D2
1N
4004
VOUT
1
VI
N
8
G1
2
G4
7
G2
3
G3
6
U2
7805
Z2
110 O
hm
s at 100M
H
z
Z3 300m
a/150ohm
s
Z4 300m
a/150ohm
s
R
22
10 O
hm
s
R2
0
20 O
hm
s
R1
9
20 O
hm
s
R1 1K
R2
1K
R3
1K
R4 1K
R1
6
330K R1
5
330K
C1
0
0.1uF
VDD
JP
1
JP
2
R2
1
470 O
hm
s
MOV1
140-J
JP
4
JP
3
VDD
CAL-
LOW
CAL-
HI
GH
R2
3
1K
J12L
0 O
hm
s
J11L
0 O
hm
s
J12H
0 O
hm
s
J11H
0 O
hm
s
J13L
0 O
hm
s
J14L
0 O
hm
s
J14H
0 O
hm
s
J13H
0 O
hm
s
J15L
0 O
hm
s
J15H
0 O
hm
s
R1
7
1K
Y1
3.579545M
H
Z
R1
8
820 O
hm
s
+
-
D1
RED LED
4 3
1 2
U3 P
S
2501
VDD
JP
7
JP
8
JP
5
JP
6
J1 0 O
hm
s
J2 0 O
hm
s
J3 0 O
hm
s
R5 300K
R6 150K
R7 75K
J4 0 O
hm
s
R8 39K
J5 0 O
hm
s
R9 18K
J6 0 O
hm
s
R1
0
9.1K
J7 0 O
hm
s
R1
1
5.1K
J8 0 O
hm
s
R1
2
2.2K
J9 0 O
hm
s
R1
3
1.2K
J10 0 O
hm
s
R1
4
560 O
hm
s
CAL-
HI
GH
CAL-
LOW
CALIBRATION NETW
ORK
T
o C
alibration N
etw
ork
Z1
110 O
hm
s at 100M
H
z
M
C
P3905 Energy M
eter Reference Design
2
103-00037
DVDD
1
HP
F
2
AVDD
3
NC1
4
CH0
+
5
CH0
-
6
CH1
-
7
CH1
+
8
MCLR
9
REF
IN
/OUT
10
AGND
11
F2
12
F1
13
F0
14
G1
15
G0
16
OSC2
17
OSC1
18
NC2
19
NEG
20
DGND
21
HF
OUT
22
FO
U
T
1
23
FO
U
T
0
24
U1
M
C
P
3905-S
S
O
P
24
REV
RE
V
H
ist
ory
Dat
e
1
In
itia
l R
elea
se
10/
21/
05