CS5490-ISZ

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. A configurable digital output provides energy pulses, zero-crossing, 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 interface 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 production line. Performance across temperature is ensured with an on-chip voltage reference with low drift. A single 3.3V power supply 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.

• 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.)
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