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Figure 21.
STDES-EMETER1PV1 circuit schematic (8 of 8)
DGND
PA5_SPI1_SCK
PA1_ZCR
PA6_SPI1_MISO
PC5_INT
PC4_SYN
PA7_SPI1_MOSI
ISO_GND
3V3
PA0_SPI1_NSS
PC2_EN
C51
10nF,25V
Y
3
1
6
M
H
z
C38
100nF,16V
L13
10uH
R67
0E
R
5
8
2
2
K
U8
STPM33
VDDA
21
LED2
5
VCC
23
GND_REG
22
INT2
7
CLKIN/XTAL2
2
XTAL1
3
LED1
4
NC
24
V
D
D
D
2
7
S
Y
N
2
8
S
C
S
2
9
S
C
L
3
0
M
O
S
I/R
X
D
3
1
M
IS
O
/T
X
D
3
2
INT1
6
V
IN
1
1
0
IIP
1
1
1
IIN
1
1
2
IIP
2
1
3
IIN
2
1
4
N
C
1
5
GND_REF
18
GNDA
20
G
N
D
_
E
X
3
3
EN
8
CLKOUT/ZCR
1
V
IP
1
9
N
C
1
6
VREF1
17
VREF2
19
G
N
D
D
2
6
G
N
D
D
_
N
C
2
5
C48
22nF,25V
L3
1500E
L6
1500E
C43
150pF,50V
L4
1500E
L7
1500E
R
4
7
1
ME
C47
100nF,16V
C39
150pF,50V
C46
150pF,50V
C33
150pF,50V
R43
10K
C40
150pF,50V
C42
150pF,50V
L14
10uH
R56
100E
R55
470
R60
Shunt
C34
100nF,16V
C35
150pF,50V
L12
10uH
C52
10nF,25V
R66
1K
R57
1K
C45
15pF
C41
1uF,25V
R41
10K
R52
270K
R62
1K
C49
100nF,16V
C36
15pF
R45
100E
C28
150pF,50V
C29
100nF,16V
R49
0E
R64
0E
R54
270K
R44
10K
C32
100uF, 10V
R59
1K
L2
1500E
R92
0E
C31
150pF,50V
R53
270K
J12
CON1
1
J11
CON1
1
R61
6E
C50
150pF,50V
C27
10nF,25V
C37
150pF,50V
R42
10K
L5
INDUCTOR IRON/SM
L11
10uH
C30
4.7uF,25V
C44
100nF,16V
NEUTRAL_LOAD
ISO_GND
NEUTRAL_MET
PHASE_LOAD
IIP1
IIN2
NEUTRAL_LOAD
PHASE_MET
IIP2
IIN1
PA1_ZCR
VIN1
VREF1
VIP1
3
V
3
PC4_SYN
PA0_SPI1_NSS
PA7_SPI1_MOSI
PA6_SPI1_MISO
3V3
PA5_SPI1_SCK
PHASE_MET
NEUTRAL_MET
PHASE_LOAD
V
IP
1
V
IN
1
IIP
2
IIP
1
IIN
1
PC5_INT
VREF2
IIN
2
PC2_EN
UM2898
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Rev 1
page 20/31
UM2898
Schematic diagrams