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Energy Measurement

CS5490

Two Channel Energy Measurement IC

CS5490 Overview

The CS5490 is part of the CS548x/9x family of high performance analog front end solutions for energy measurement with two (CS5490), three (CS5480) or four (CS5484) 24-bit analog to digital converters. It provides high-accuracy energy measurement at a very low price, and on-chip energy calculations and fast on-chip calibration speeds product development cycles. Flexibility in current sensors, serial communications and digital outputs ensures that the CS5490 is a fit for any application requiring high-accuracy energy measurement at a very low price.

Product Features

  • Superior analog performance with ultra-low noise level and high SNR

  • Energy measurement accuracy of 0.1% over 4000:1 dynamic range

  • Current RMS measurement accuracy of 0.1% over 1000:1 dynamic range

  • 2 independent 24 bit, 4th order Delta Sigma modulators for voltage and current measurements

  • Configurable digital output for energy pulses, zero crossing or energy direction

  • Supports shunt resistor, CT and Rogowski coil current sensors

  • Overcurrent, voltage sag and voltage swell detection

  • UART serial interface

  • Internal register protection via checksum and write-protection

  • On-chip voltage reference (25 ppm/°C typ.)

  • Single 3.3V power supply

  • Low power consumption: < 13mW

  • 16-pin SOIC package

  • On-chip measurements / calculations:

Parametric Specifications

Package16 SOIC
Serial CommUART
Digital OutputsSingle Configurable Output
THD (dB)100
ADC Converters2
Analog Power Supply (V)3.3
Digital Power Supply (V)3.3
Power Consumption (mW)13
Active Power Accuracy0.1% over 4000:1 dynamic range
Current RMS Accuracy0.1% over 1000:1 dynamic range
Current Sensor OptionsShunt resistor, current transformer, or Rogowski coil
Power Factor Accuracy+/-0.1% over 1000:1 dynamic range
Reactive Power Accuracy0.1% over 4000:1 dynamic range
Voltage RMS Accuracy+/-0.1% over 20:1 dynamic range
Voltage Sensor OptionsResistor divider or transformer

Design Resources

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Evaluation Boards

  • CS5490 Power Meter Evaluation Board (CDB5490U)

    CS5490 Power Meter Evaluation Board (CDB5490U)

    The CDB5490U engineering board and GUI software provide an extensive platform for evaluating the CS5490 power measurement device, with multiple analog inputs, isolated UART communication, an onboard microcontroller, and a standalone power-meter application.

    User Guide
  • Power Monitor Reference Design (CRD5490-Z)

    Power Monitor Reference Design (CRD5490-Z)

    The CRD5490-Z is a reference design used to evaluate the CS5490 power/energy measurement device. It integrates an AC/DC buck supply, voltage and current sensors, and a USB MCU with GUI software for real-time voltage, current, power, and temperature measurements.

    User Guide

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