CS5464-IS データシートの表示（PDF） - Cirrus Logic

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CS5464-IS

Three-channel, Single-phase Power/Energy IC

Cirrus Logic 

CS5464

9. BASIC APPLICATION CIRCUITS

Figure 19 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, or CT, is connected to the return line

current, which implements the tamper detection circuit.

5 kΩ

10 kΩ

L2

LINE

L1

VOLTAGE

500 Ω

500

10 Ω

470 nF

470 µF

0.1 µF

18

VA+

0.1 µF

3

VD+

R2

R1

CT

LOAD

CS5464

21

CV-

9 VIN+

CVdiff

PFMON

CPUCLK 2

XOUT 1

R V-

CV+

10 VIN-

XIN 28

R I-

RShunt

19 IIN-

C I-

C Idiff

R

I+

1kΩ

RBurden

1kΩ

Note:

C I+

RI-

20 IIN+

15

IIN2-

C Idiff

16 IIN2+

RI+

0.1 µF

12 VREFIN

11 VREFOUT

AGND

Indicates common (floating) return.

17

23

RESET

CS 7

SDI 27

SDO 6

SCLK 5

INT 24

E2 26

E1 25

13

TEST1

TEST2 14

DGND

4

4.096 MHz

Optional

Clock

Source

Serial

Data

Interface

Pulse Output

Counter

Figure 19. Typical Connection Diagram (Single-phase, 2-wire – Direct Connect to Power Line)

DS682PP1

43

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