FEATURES

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Meets the IEC 61036 Specification requirements for

Class 1 AC static watt-hour meters for active energy

Less than 0.5% Error over a dynamic range of 1:1000

The motor drive outputs (MOP, MON) provide the average

power information and can drive an electro-mechanical

counter directly

LED pulse output for calibration purposes

sames

Single Phase Kilowatt-hour Metering IC

SA2102D

1/16

SPEC-0510 (REV. 5)

12-02-03

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Bi-directional and uni-directional energy measurement

Configurable for different meter ratings

Precision on-chip oscillator (70ppm/°C drift)

Precision on-chip voltage reference (10ppm/°C drift)

On-chip anti-creep function (0.02% of Imax)

Low power consumption (<25mW typical)

DESCRIPTION

The SAMES SA2102D* is an accurate single phase

power/energy metering integrated circuit providing a single-

chip solution for energy meters. Very few external components

are required and has direct drive capability for electro

mechanical counters. The SA2102D does not require an

external crystal. A precision oscillator, which supplies the

circuitry with a stable frequency, is integrated on chip. The

SA2102D metering integrated circuit generates a pulse rate

output, the frequency of which is proportional to the power

consumption. The SA2102D performs the calculation for

active power. The method of calculation takes the power factor

into account.

Programmable inputs allow the meter manufacturer to

configure the SA2102D for different meter maximum currents

(I

) and nominal voltages (V

) without having to change

the stepper motor or impulse counter gear ratio. The LED pulse

output follows the average power consumption measured and

is intended for meter calibration purposes. In fast calibration

mode this output provides a high frequency pulse rate following

the instantaneous power consumption and can be used for fast

calibration or to interface with a microcontroller. The SA2102D

includes an anti-creep feature preventing any creep effects in

the meter. The SA2102D can be configured for positive,

negative or bi-directional energy measurement.

The SA2102D integrated circuit is pin compatible to the

SA2002D and is available in 20 pin dual-in-line plastic

(PDIP20), as well as 20 pin small outline (SOIC20) package

types.

MAX

NOM

Figure 1: Block diagram

http://www.sames.co.za

* Patents EP0559499, US5396447, PT559499T, ZA9301579, ZA9400273, ZA9702075

IIP

IIN

IVP

AGND

ADC

ADC

VOLTAGE REFERENCE

AND

CURRENT BIASING

VREF

DIGITAL

OUTPUT

DIGITAL

OUTPUT

INTEGRATION

Instantaneous

power

Average

Power

SIGNAL

PROCESSING BLOCK

POWER ON

RESET

VDD

SO

DIRI

DIRO

OSCILLATOR

AND

TIMING

DIVISION

FOR

CALIBRATION

LED OUTPUT

FAST

DIVISION

FOR

COUNTER DRIVER

LED

R0

R1

R2

MON

MOP

CNF

VSS

MOTOR

DRIVING

BUFFERS