PM9904BPD
ssaammeess
SCHEMATIC
JUMPS2
R17
J1
J2
J3
C2
B2
A2
R14
82k
R15
R16
82k
C4
B4
PH3
PH2
PH1
C1
B1
A1
C3
B3
A3
V3 In
V2 In
V1In
120k
120k
JUMPS2
R11
24k
R18
82k
R19
R20
82k
R21
120k
120k
JUMPS2
R12
24k
R22
82k
R23
R24
R25
A4
120k
82k
U1
120k
R1
R13
24k
CT1
19
16
IIN1
GND
2.7k
R26
2.7R
GND
C5
1u
R8
17
20
3
IVP1
IVP2
IVP3
1M
R9
R2
18
2
IIP1
IIN2
TZ76
CT2
C4
1u
2.7k
1M
R10
GND
R3
C3
1u
2.7k
1M
R27
JP1
2.7R
7
8
13
12
9
F50
SCK
CS
MOSI
MISO
VDD
F50
DO
F50
SCK
CS
DI
DO
1
VSS
2
SCK
CS
DI
R4
1
5
F50
3
IIP2
IIN3
TZ76
CT3
SCK
4
2.7k
CS
5
GND
MISO
6
R5
MOSI
CE
7
8
2.7k
R28
2.7R
VDD
SPI Port
R6
4
10
IIP3
OSC1
C2
TZ76
2.7k
220n
X1
3.5795MHz
GND
R7
15
14
11
6
V3 Out
V2 Out
V1 Out
VREF
OSC2
VDD
GND
J7
47k
C1
220n
C6
1u
GND
N
VSS
N Node
VDD
VSS
SA9904B
VSS
Figure 14 : Schematic diagram of metering section
J4
VDD
VP
R32
VD
D1
D2
470/1W
VDD
C12
R29
LL1
1N4007
1N4007
PH1
C10
470/25V
C8
10u
+
+
+
47
Z1
470/250VAC
U3
TL431
SK1
D3
D4
N
PH1
S10/275
J6
GND
4
PH2
3
C13
R30
47
LL2
1N4007
1N4007
PH3
PH2
2
1
D7
47V
N
N
Z2
470/250VAC
MAINS
C11
470/25v
C9
10u
+
D6
N
S10/275
R31
D5
U4
TL431
C15
470
+
C14
J5
VSS
1N4007
1N4007
PH3
LL3
470/250VAC
47
R33
VS
Z3
470/1W
VSS
VN
N
S10/275
Figure 15: Schematic diagram of power supply
12/22
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