FEATURES

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Provides a single chip solution for energy meters having a

mechanical display

No external crystal or resonator required

Direct stepper motor / impulse counter drive

Unidirectional and bi-directional energy measurement

Meets the IEC 521/1036 Specification requirements for

Class 1 AC Watt hour meters

Sames

Single Phase Kilowatt-hour Metering IC for

Mechanical Display Applications

SA2002D

1/10

SPEC-0024 (REV. 4)

18-11-02

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Configurable for different meter ratings

Adaptable to different types of current sensors

Precision voltage reference on chip

Operates over a wide temperature range

Low power consumption

DESCRIPTION

The SAMES SA2002D provides a single chip solution for

single phase energy meters. Very few external components

are required and it has direct drive capability for

electromechanical counters. The SA2002D does not required

an external crystal. A precision oscillator, which is supplies the

circuitry with a stable frequency, is integrated on chip.

Programmable inputs allow the meter manufacturer to

configure the SA2002D for different meter ratings without

having to change the stepper motor or impulse counter gear

ratio. A high frequency pulse output is available at the LED

output for meter calibration purposes. The SA2002D includes

an anti-creep feature.

The SA2002D can be configured for positive, negative or bi-

directional energy measurement.

The SA2002D Single Phase kWh metering integrated circuit

generates a pulse rate output, the frequency of which is

proportional to the power consumption. The SA2002D

performs the calculation for active power. The method of

calculation takes the power factor into account.

The SA2002D 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

ANALOG

SIGNAL

PRO-

CESSING

LED-

PULSE

POWER

INTE-

GRATOR

COUNTER

DRIVER

REFERENCE

&

BIAS

OSC TIMING

LED

VDD

DIRI

FAST

DIRO

MOP

IIP

IVP

MON

IIN

AGND

R0 R1 R2

VREF

Dr-01566

VSS CNF