CS5461A-IS 데이터 시트보기 (PDF) - Cirrus Logic
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CS5461A-IS Datasheet PDF : 44 Pages
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CS5461A
9. BASIC APPLICATION CIRCUITS
Figure 15 shows the CS5461A configured to measure
power in a single-phase, 2-wire system while operating
in a single-supply configuration. In this diagram, a shunt
resistor is used to sense the line current and a voltage
divider is used to sense the line voltage. In this type of
shunt resistor configuration, the common-mode level of
the CS5461A must be referenced to the line side of the
power line. This means that the common-mode poten-
tial of the CS5461A will track the high-voltage levels, as
well as low-voltage levels, with respect to earth ground
potential. Isolation circuitry is required when an earth-
ground-referenced communication interface is connect-
ed.
Figure 16 shows the same single-phase, two-wire sys-
tem with complete isolation from the power lines. This
isolation is achieved using three transformers: a general
purpose transformer to supply the on-board DC power;
a high-precision, low-impedance voltage transformer
with very little roll-off/phase-delay, to measure voltage;
and a current transformer to sense the line current.
Figure 17 shows a single-phase, 3-wire system. In
many 3-wire residential power systems within the Unit-
ed States, only the two line terminals are available (neu-
tral is not available). Figure 18 shows the CS5461A
configured to meter a three-wire system with no neutral
available.
120 VAC
N
L
500 Ω
500
10 Ω
5 kΩ
10 kΩ
470 nF
470 µF
0.1 µF
14
VA+
0.1 µF
3
VD+
CS5461A
R2
R1
R V-
R I-
RShunt
R
I+
CV-
9 VIN+
CVdiff
PFMON 17
CPUCLK 2
XOUT 1
CV+
10 VIN-
XIN 24
15 IIN-
C I-
RESET 19
C Idiff
CS 7
C I+
16 IIN+
SDI 23
SDO 6
SCLK 5
12 VREFIN
11 VREFOUT
INT 20
E2 22
21
E1
0.1 µF
AGND DGND
4.096 MHz
Optional
Clock
Source
Serial
Data
Interface
Note:
Indicates common (floating) return.
13
4
Mech. Counter
or
Stepper Motor
Figure 15. Typical Connection Diagram (Single-phase, 2-wire – Direct Connect to Power Line)
DS661F2
39
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