CS5460 Просмотр технического описания (PDF) - Cirrus Logic

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CS5460

Single Phase Bi-Directional Power/Energy IC

Cirrus Logic 

CS5460

2. GENERAL DESCRIPTION

The CS5460 is a CMOS monolithic power mea-

surement device with an energy computation en-

gine. The CS5460 combines a programmable gain

amplifier, two ∆Σ modulators, two high rate filters,

system calibration, and power calculation func-

tions to compute Energy, VRMS, IRMS, and Instan-

taneous Power.

The CS5460 is designed for power meter applica-

tions and is optimized to interface to shunts or cur-

rent transformers to measure current, and a

resistive divider or transformer to measure voltage.

To accommodate various input voltage levels due

to shunts, the current channel includes a program-

mable gain amplifier (PGA) which allows the user

to measure either 150mVRMS or 30mVRMS signals.

The CS5460 includes two high-rate digital filters

which output data at a (MCLK/K)/1024 output word

rate (OWR). A high-pass filter in both channels can

be enabled to remove the DC content from the input

signal before the energy calculations are made.

To ease communication between the CS5460 and a

micro-controller, the converter includes a simple

three-wire serial interface which is SPI™ and Mi-

crowire™ compatible. The serial port also contains

a Schmitt Trigger input on its serial clock (SCLK)

to allow for slow rise time signals.

2.1 Theory of Operation

The CS5460 is designed to operate from a single

+5 V supply or dual ±2.5 V supplies, to provide a

30mVRMS or 150mVRMS range for the current

channel and to provide a 150mVRMS range for the

voltage channel. With single supply, the CS5460 is

designed to accommodate common mode signals

of -0.25V to VA+.

Figure 3 illustrates the CS5460 connected to a ser-

vice to measure power in a single-phase 2-wire sys-

tem while operating in a single supply

configuration. Figure 4 illustrates the CS5460 con-

figured to measure power in a single-phase 3-wire

system.

N

L

500 Ω

470 nF

R2

R1

500 Ω

100 µF

10 kΩ

5 kΩ

10 Ω

0.1 µF

14

VA+

3

VD+

0.1 µF

9

CPV *

VIN+

CS5460

PFMON 17

CPUCLK 2

XOUT 1

2.5 MHz to

20 MHz

10 VIN-

15 IIN-

XIN 24

Optional

Clock

Source

To Service

RS

RPI *

CPI *

0.1 µF

16 IIN+

12 VREFIN

11 VREFOUT

RESET 19

CS 7

SDI 23

SDO 6

SCLK 5

INT 20

EDIR 22

EOUT 21

VA-

13

DGND

4

* Refer to Input Current Protection

Serial

Data

Interface

Figure 3. Typical Connection Diagram (One-Phase 2-Wire)

DS279PP5

9

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