DESCRIPTION
The SAMES SA9904A is a three phase bi-directional energy/power metering integrated circuit that performs measurement of active and reactive power, mains voltage and mains frequency.
The SA9904A is pin compatible to the SA9604A. New features include, RMS mains voltage and accurate reactive power measurements.
Measured values for active and reactive energy, the mains voltage and frequency for each phase are accessible through a SPI bus from 24 bit registers.

FEATURES
■ Bi-directional active and reactive power/energy measurement
■ RMS Voltage and frequency measurement
■ Individual Phase information
■ SPI communication bus
■ Meets the IEC 521/1036 Specification requirements for Class 1 AC Watt hour meters
■ Meets the IEC 1268 Specification requirements for 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 voltage reference on-chip