CS5464 datasheet(42/46 Pages) CIRRUS

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CS5464

DS682F3

11. BASIC APPLICATION CIRCUITS

Figure 14 shows the CS5464 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 CS5464 must be referenced to the line side of the

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

tial of the CS5464 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. A cur-

rent transformer (CT) is connected to the return line

current, which implements the tamper detection circuit.

VA+

VD+

CS5464

0.1µF

470µF

500 W

1uF

500

10W

IIN-

IIN+

PFMON

CPUCLK

XOUT

XIN

Optional

Clock

Source

Serial

Data

Interface

RESET

SDI

SDO

SCLK

INT

0.1µF

VREFIN

VREFOUT

AGND

DGND

4.096 MHz

0.1 µF

10 kW

5kW

Shunt

V-

I-

I+

Pulse Output

Counter

I-

I+

Idiff

V+

V-

CVdiff

IIN2-

IIN2+

½ R

I-

I+

Burden

Idiff

VIN-

VIN+

TEST2

TEST1

LOAD

LINE

VOLTAGE

½ R

Burden

I-

C I+

Figure 14. Typical Connection Diagram (Single-phase, 2-wire – Direct Connect to Power Line)

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