SA9904B

Three Phase Power / Energy IC with SPI Interface SA9904B FEATURES + Bi-directional + + + + active and reactive power/energy measurement RMS Voltage and frequency measurement Individual Phase information SPI communication bus Meets the IEC 61036 Specification requirements for Class 1 AC Watt hour meters sames + + + + + + Meets the IEC 61268 Specification requirements for Class 2 VAR hour meters Protected against ESD Total power consumption rating below 60mW Uses current transformers for current sensing Operates over a wide temperature range Precision on-chip voltage reference DESCRIPTION The SAMES SA9904B is a three phase bi-directional energy/power metering integrated circuit that has been designed to measure active and reactive energy, RMS mains voltage and frequency. The SA9904B has an integrated SPI serial interface for communication with a micro-controller. Measured values for active and reactive energy, the mains voltage and frequency for each phase are accessible through the SPI interface from 24 bit registers. The SA9904B active and reactive energy registers are capable of holding at least 52 seconds of accumulated energy at full load. A mains voltage zero crossover is available on the F50 output. The SA9904B includes all the required functions for threephase power and energy measurement such as oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration. This innovative universal three phase power/energy metering in...