Two Channel Energy Measurement IC

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.



Energy Measurement


  • 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:
    • Active, reactive and apparent power
    • RMS voltage and current
    • Power factor and line frequency
    • Instantaneous voltage, current and power

Parametric Specifications

ADC Converters 2
Current Sensor Options Shunt resistor, current transformer, or Rogowski coil
Voltage Sensor Options Resistor divider or transformer
Active Power Accuracy 0.1% over 4000:1 dynamic range
Reactive Power Accuracy 0.1% over 4000:1 dynamic range
Power Factor Accuracy +/-0.1% over 1000:1 dynamic range
THD (dB) 100 (SNR: 80 dB)
Digital Outputs Single Configurable Output
Analog Power Supply (V) 3.3
Digital Power Supply (V) 3.3
Power Consumption (mW) 13
Package 16 SOIC

Technical Documents

Errata: CS5490 Rev B2 Silicon

Jun 6, 2013, ER982B2 : 170 Kb

CS5490 Product Datasheet

Mar 15, 2013, DS982F3 : 815 Kb

CS5480/84/90 Product Bulletin

Jan 24, 2012, n/a : 1484 Kb

Software and Tools

CRD5490 Reference Design GUI

May 1, 2012, V1-P1 : 63962 Kb

CDB5490U Evaluation GUI

Mar 28, 2012, v2.2.2 : 27207 Kb


Comprehensive Solutions