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STPM32 Datasheet(PDF) 14 Page - STMicroelectronics

Part # STPM32
Description  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  89 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 14 Page - STMicroelectronics

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5
Typical application example
Figure 11 below shows the reference schematic of an application with the following properties:
•
Constant pulses CP = 41600 imp/kWh
•
INOM = 5 A
•
IMAX = 90 A
Typical values for current sensor sensitivity are indicated in Table 6.
Please refer to Section 9 for more information about the application dimensioning and calibration
Figure 11. STPM34 application schematic
Vp1
Vcc
Vcc
Vp2
Ip1
Ip2
In2
line 2
Vcc
Vcc
Vre f2
Vre f1
RXD
TXD
Vre f1
S CS
Vre f2
In1
1 NC
2 MOSI
3 Gnd
4 MISO
5 SCS
6 SCL
7 NC
8 SYN
9 NC
10 Vcc
1 Int1
2 Int2
3 Led2
4 En/Rst
5 Led1
6 Gnd
7 Ckin
8 Ckout/ZCR
R4
1M
RS 1
BKW-M-R0003-5.0
R22
1K
R15
470R
C15 150p
R3
100R
C24
22n
R24
270K
C10 10n
U3
S TP M33/34
EN
8
INT2
7
INT1
6
LED2
5
LED1
4
XTAL1
3
CKin/XTAL2
2
CKout/ZCR
1
VCC
23
GNDre g
22
VDDA
21
GNDA
20
VREF1
17
GNDre f
18
VREF2
19
NC
24
Ex
Ex
C25
10n
J 8
N
1
R21
6R
R5
4.7K
C23
100u 10V
J 7
DC S upply
R10
10K
R13
270K
R7
10K
R12
270K
R17
1K
R20
1K
J 11
Vre f 1-2
R19
0R
C14 150p
DL2 LED2
R23
270K
J 4
Ena ble /RS T
1
1
2
2
3
3
C12 150p
R26
470R
C22
100n
DL1 LED1
C34
22n
C9
150p
C17
15p
C19
100n
J 9
L1
1
C8
100n
C16
15p
R6
4.7K
J 10
L2
1
R8
10K
Y1
16MHz
R25
270K
C33
10n
J 5
DIGITAL I/O
2
4
6
8
1
3
5
7
C11 150p
R18
1K
J 6
S P I
C13 150p
R2
22K
C20
4.7u
R14
270K
R9
10K
T2
VAC 4626-X002
STPM32, STPM33, STPM34
Typical application example
DS10272 - Rev 13
page 14/89



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