CS5490-ISZR データシートの表示（PDF） - Cirrus Logic

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CS5490-ISZR

Two Channel Energy Measurement IC

Cirrus Logic 

CS5490

Two Channel Energy Measurement IC

Features & Description

Description

• Superior Analog Performance with Ultra-low Noise Level &

High SNR

• Energy Measurement Accuracy of 0.1% over a 4000:1

Dynamic Range

• Two Independent 24-bit, 4th-order, Delta-Sigma

Modulators for Voltage and Current Measurements

• Configurable Digital Output for Energy Pulses, Interrupt,

zero-crossing, and Energy Direction

• Supports Shunt Resistor, CT, and Rogowski Coil Current

Sensors

• On-chip Measurements/Calculations:

- Active, Reactive, and Apparent Power

- RMS Voltage and Current

- Power Factor and Line Frequency

- Instantaneous Voltage, Current, and Power

• Overcurrent, Voltage Sag, and Voltage Swell Detection

• Ultra-fast On-chip Digital Calibration

• Configurable No-load Threshold for Anti-creep

• Internal Register Protection via Checksum and Write

Protection

• UART Serial Interface

• On-chip Temperature Sensor

• On-chip Voltage Reference (25ppm/°C Typ.)

• Single 3.3 V Power Supply

• Ultra-fine Phase Compensation

• Low Power Consumption: <13 mW

• Power Supply Configurations:

- GNDA = 0 V, VDDA: +3.3 V

• Low-cost 16-pin SOIC Package

The CS5490 is a high-accuracy, two-channel, energy measure-

ment analog front end.

The CS5490 incorporates independent 4th order Delta-Sigma an-

alog-to-digital converters for both channels, reference circuitry,

and the proven EXL signal processing core to provide active, re-

active, and apparent energy measurement. In addition, RMS and

power factor calculations are available. Calculations are output

via a configurable energy pulse, or direct UART serial access to

on-chip registers. Instantaneous current, voltage, and power

measurements are also available over the serial port. The

two-wire UART minimizes the cost of isolation where required.

A configurable digital output provides energy pulses, zero-cross-

ing, energy direction, or interrupt functions. Interrupts can be

generated for a variety of conditions including voltage sag or

swell, overcurrent, and more. On-chip register integrity is assured

via checksum and write protection. The CS5490 is designed to in-

terface to a variety of voltage and current sensors, including shunt

resistors, current transformers, and Rogowski coils.

On-chip functionality makes digital calibration simple and ultra

fast to minimize the time required at the end of the customer pro-

duction line. Performance across temperature is ensured with an

on-chip voltage reference with low drift. A single 3.3V power sup-

ply is required, and power consumption is low at <13mW. To

minimize space requirements, the CS5490 is offered in a low-cost

16-pin SOIC package.

ORDERING INFORMATION

See Page 56.

VDDA

RESET

VDDD

CS5490

IIN +

IIN-

PGA

4th Order 

Modulator

Digital

Filter

HPF

Option

VIN+

VIN-

10x

VREF+

VREF-

Voltage

Reference

Cirrus Logic, Inc.

http://www.cirrus.com

GNDA

4th Order 

Modulator

Digital

Filter

HPF

Option

Temperature

Sensor

System

Clock

Clock

Generator

UART

Serial

RX

Interface

TX

Calculation

Configurable

Digital

DO

Output

XIN XOUT

MODE

Copyright  Cirrus Logic, Inc. 2012

(All Rights Reserved)

JUN’12

DS982F2

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