+ FEATURES

measurement

Class 1 AC Watt hour meters

sames

sames

Single Phase Power / Energy IC

with SPI Interface

SA9903B

1/12

SPEC-0051 (REV. 2)

26-02-01

hour meters

DESCRIPTION

The SAMES SA9903B is a single phase bi-directional

energy/power metering integrated circuit that performs

measurement of active and reactive power, mains voltage and

mains frequency.

The SA9903B is pin compatible to the SA9603B. New features

include, RMS mains voltage and accurate reactive power

measurements.

Measured values for active and reactive energy, the mains

voltage and frequency are accessible through a SPI bus from

24 bit registers.

This innovative universal single phase power/energy metering

integrated circuit is ideally suited for energy calculations in

applications such as electricity dispensing systems (ED's),

residential municipal metering and factory energy metering

and control.

TheSA9903B integrated circuit is available in both 20 pin dual-

in-line plastic (DIP-20), as well as 20 pin small outline (SOIC-

20) package types.

Figure 1: Block diagram

IVP

SPI

VOLTAGE

REF.

DI

VSS

VDD

DO

FMO

VREF

Dr-01583

OSC2

OSC1

GND

ACTIVE

REACTIVE

RMS

VOLTAGE

MAINS.

FREQ.

CURRENT

ADC

VOLTAGE

ADC

SCK

CS

OSC

IIP

IIN

TEST