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.