User manual
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
54321
D
C
B
A
Title
Number RevisionSize
B
Date: 17-Jun-2005 Sheet of
File: C:\Active Board Files\102-00031 thru 102-00040\102-00037\PCB Files\Protel Files\0003
Drawn By:
C13
10uF/6.3V
C11
220uF/6.3V
C12
0.1uF
C1
0.033uF
C2
0.033uF
C3
0.033uF
C4
0.033uF
C17
0.47uF
C16
0.01uF
C6
0.1uF
C15
0.1uF
C14
0.1uF
C9 22pF
C8 22pF
C7
0.1uF
C18
470uF/35V
C5
10uF/6.3V
D3
1N4744A
D2
1N4004
VOUT
1
VIN
8
G1
2
G4
7
G2
3
G3
6
U2
7805
Z2
110 Ohms at 100MHz
Z3
300ma/150ohms
Z4
300ma/150ohms
R22 10 Ohms
R20
20 Ohms
R19
20 Ohms
R1
1K
R2
1K
R3
1K
R4
1K
R16
330K
R15
330K
C10
0.1uF
VDD
JP1
JP2
R21
470 Ohms
MOV1
140-J
JP4
JP3
VDD
CAL-LOWCAL-HIGH
R23
1K
J12L
0 Ohms
J11L
0 Ohms
J12H
0 Ohms
J11H
0 Ohms
J13L
0 Ohms
J14L
0 Ohms
J14H 0 Ohms
J13H 0 Ohms
J15L
0 Ohms
J15H 0 Ohms
R17
1K
Y1
3.579545MHZ
R18
820 Ohms
+ -
D1
RED LED
4
3
1
2
U3
PS2501
VDD
JP7
JP8
JP5
JP6
J1
0 Ohms
J2
0 Ohms
J3
0 Ohms
R5
300K
R6
150K
R7
75K
J4
0 Ohms
R8
39K
J5
0 Ohms
R9
18K
J6
0 Ohms
R10
9.1K
J7
0 Ohms
R11
5.1K
J8
0 Ohms
R12
2.2K
J9
0 Ohms
R13
1.2K
J10
0 Ohms
R14
560 Ohms
CAL-HIGH
CAL-LOW
CALIBRATION NETWORK
To Calibration Network
Z1
110 Ohms at 100MHz
MCP3905 Energy Meter Reference Design
2
103-00037
DVDD
1
HPF
2
AVDD
3
NC1
4
CH0+
5
CH0-
6
CH1-
7
CH1+
8
MCLR
9
REFIN/OUT
10
AGND
11
F2
12
F1
13
F0
14
G1
15
G0
16
OSC2
17
OSC1
18
NC2
19
NEG
20
DGND
21
HFOUT
22
FOUT1
23
FOUT0
24
U1
MCP3905-SSOP24
REV
REV History Date
1
Initial Release
10/21/05