Cirrus Logic CS5464-ISZ

The CS5464 is a watt-hour meter on a chip. It measures line voltage and current and calculates active, reactive, apparent power, energy, power factor, and RMS voltage and current. There are two separate inputs to measure line, ground, and/or neutral current enabling the meter to detect tampering and to continue operating. An internal RMS voltage reference can be used if voltage measurement is disabled by tampering. Four  analog-to-digital converters are used to measure voltage, two currents, and temperature. The CS5464 is designed to interface to a variety of voltage and current sensors. Additional features include system-level calibration, voltage sag and current fault detection, peak detection, phase compensation, and energy pulse outputs.

• Energy Linearity: ±0.1% of Reading over 1000:1 Dynamic Range
• On-chip Functions:
  • Voltage and Current Measurement
  • Active, Reactive, and Apparent Power/Energy
  • RMS Voltage and Current Calculations
  • Current Fault and Voltage Sag Detection
  • Calibration
  • Phase Compensation
  • Temperature Sensor
  • Energy Pulse Outputs
• Meets Accuracy Spec for IEC, ANSI, & JIS
• Low Power Consumption
• Tamper Detection and Correction
• Ground-referenced Inputs with Single Supply
• On-chip 2.5 V Reference (40 ppm/°C typ.)
• Power Supply Monitor Function
• Three-wire Serial Interface to Microcontroller or E2PROM
• Power Supply Configurations: GND: 0 V, VA+: +5 V, VD+: +3.3 V to +5 V