FEATURES

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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

Three Phase Power / Energy IC with SPI

Interface

SA9904B

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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

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

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.

mains voltage

zero crossover is available on the F50 output.

The SA9904B includes all the required functions for three-

phase 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 integrated circuit is ideally

suited for energy calculations in applications such as electricity

dispensing systems, residential metering and factory energy

metering and control.

The SA9904B integrated circuit is available in 20 pin dual-in-

line plastic (PDIP20), as well as 20 pin small outline (SOIC20)

package types.

Figure 1: Block diagram

SPEC-0447 (REV. 5)

05-02-03

IVP1

SPI

VOLTAGE

REF.

DI

VSS

VDD

DO

F50

VREF

OSC2

OSC1

GND

ACTIVE

REACTIVE

RMS

VOLTAGE

MAINS

FREQ.

CURRENT

ADC

VOLTAGE

ADC

SCK

CS

OSC

IIP1

IIP2

IVP2

IVP3

IIN2

IIN2

IIN3

IIP3

DR-01641