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CS5460A
complete isolation from the power lines. This isola-
tion is achieved using three transformers. One
transformer is a general-purpose voltage trans-
former, used to supply the on-board DC power to
the CS5460A. A second transformer is a high-pre-
cision, low-impedance voltage transformer (often
called a ‘potential transformer’) with very little
roll-off/phase delay, even at the higher harmonics.
A current transformer is then used to sense the line
current. A burden resistor placed across the sec-
ondary of the current transformer creates the cur-
rent-sense voltage signal, for the CS5460A’s
current channel inputs. Because the CS5460A is
not directly connected to the power mains, isola-
tion is not required for the CS5460A’s digital inter-
face.
Figure 8 shows the CS5460A configured to mea-
sure power in a single-phase 3-wire system. In
many 3-wire residential power systems within the
United States, only the two Line terminals are
available (neutral is not available). Figure 9 shows
how the CS5460A can be configured to meter a
3-wire system when no neutral is available.
5 k ?
10 k ?
N
120 VAC
L
500 ?
500 ?
10 ?
470 nF
+ 100 μF
0.1 μF
14
3
0.1 μF
VA+
CS5460A
VD+
C* Vdiff
R 2
R 1
C * V+ *
*
9
VIN+
PFMON
CPUCLK
XOUT
17
2
1
2.5 MHz to
20 MHz
R * V-
C * V- *
10
VIN-
XIN
24
Optional
Clock
Source
15
IIN-
R * I-
C * I- *
RESET
19
C* Idiff
R Shunt
R * I+
C * I+ *
*
16
12
11
NOTE: Current channel
input measures voltage
(just like voltage input).
IIN+
VREFIN
VREFOUT
CS
SDI
SDO
SCLK
INT
EDIR
7
23
6
5
20
22
21
Serial
Data
Interface
To Service
* Refer to Input Protection
0.1 μF
VA-
13
EOUT
DGND
4
Mech. Counter
or
Stepper Motor
** Refer to Input Filtering
Figure 6. Typical Connection Diagram (One-Phase 2-Wire, Direct Connect to Power Line)
DS487F5
17
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