Description
The CS5490 is a high-accuracy, two-channel, energy measurement analog front end.
The CS5490 incorporates independent 4th order Delta-Sigma analog-to-digital converters for both channels, reference circuitry, and the proven EXL signal processing core to provide active, reactive, 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.

FEATUREs & 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