CS5463 datasheet(41/46 Pages) CIRRUS

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CS5463

DS678F2

9. BASIC APPLICATION CIRCUITS

Figure 18 shows the CS5463 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 CS5466 must be referenced to the line side of the

power line. This means that the common-mode poten-

tial of the CS5463 will track the high-voltage levels, as

well as low-voltage levels, with respect to earth ground.

Isolation circuitry is required when an earth-ground-ref-

erenced communication interface is connected.

Figure 19 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 20 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 21 shows the CS5463

configured to meter a three-wire system with no neutral

available.

VA+

VD+

CS5463

0.1 µF

470 µF

500

Ω

470 nF

500

Ω

VIN+

VIN-

IIN-

IIN+

PFMON

CPUCLK

XOUT

XIN

Optional

Clock

Source

Serial

Data

Interface

RESET

SDI

SDO

SCLK

INT

0.1 µF

VREFIN

VREFOUT

AGND

DGND

4.096 MHz

0.1 µF

10 k

Ω

Shunt

V-

I-

I+

120 VAC

Mech. Counter

Stepper Motor

I-

I+

Idiff

CV-

CV+

CVdiff

Note:

Indicates common (floating) return.

Figure 18. Typical Connection Diagram (Single-phase, 2-wire – Direct Connect to Power Line)

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