CS5460A データシートの表示（PDF） - Cirrus Logic

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CS5460A

Single Phase Bi-Directional Power/Energy IC

Cirrus Logic 

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.

120 VAC

N

L

500 Ω

500 Ω

5 kΩ

10 Ω

10 kΩ

470 nF

+ 100 µF

0.1 µF

14

VA+

0.1 µF

3

VD+

R2

R1

To Service

R*V-

R*I-

RShunt

R*

I+

CS5460A

9 VIN+

C* *

V+

C*Vd*iff

PFMON 17

CPUCLK 2

XOUT 1

C* *

V-

10 VIN-

XIN 24

15 IIN-

C*I-*

RESET 19

C*Id*iff

NOTE: Current channel

input measures voltage

CS 7

(just like voltage input).

SDI 23

16 IIN+

SDO 6

SCLK 5

C*I+*

12 VREFIN

INT 20

22

11 VREFOUT

EDIR 21

0.1 µF

EOUT

VA- DGND

13

4

* Refer to Input Protection

** Refer to Input Filtering

2.5 MHz to

20 MHz

Optional

Clock

Source

Serial

Data

Interface

Mech. Counter

or

Stepper Motor

Figure 6. Typical Connection Diagram (One-Phase 2-Wire, Direct Connect to Power Line)

17

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