FEATURES

motors

conditions

sames

sames

Pin Selectable Three Phase Power / Energy Metering

IC for Stepper Motor / Impulse Counter Applications

with Anti Tamper Features

SA2005M

1/12

SPEC-0115 (REV. 3)

09-05-02

Class 1 AC Watt hour meters

DESCRIPTION

The SAMES SA2005M provides a single chip active energy

metering solution for three phase mechanical counter-based

meter designs. Very few external components are required

and it has direct drive capability for electro-mechanical

counters.

The SAMES SA2005M is a CMOS mixed signal integrated

circuit that performs three phase power/energy calculations

over a range of 1000:1, to an overall accuracy of better than

Class 1.

The integrated circuit includes all the required functions for 3-

phase power and energy measurement such as oversampling

A/D converters for the voltage and current sense inputs, power

calculation and energy integration. Internal offsets are

eliminated through the use of cancellation procedures.

The SA2005M drives a calibration LED directly. Per phase

voltage fail and voltage sequence faults as well as energy

direction indication are available as LED outputs. Selectable

divider ratios enable various mechanical counter or stepper

motor counter resolutions.

A precision oscillator, that replaces an external crystal, is

integrated on chip. A voltage reference is integrated on chip.

The SA2005M integrated circuit is available in 24-pin dual in

line plastic (DIP-24) and small outline (SOIC-24) package

options.

Figure 1: Block diagram

REF

OSC

TIMING & CONTROL

TEST

LED

VDD VSS

IVN1

X

IIN1

IIP1

VREF

GND

IVN2

X

I2

V2

IIN2

IIP2

IVN3

X

I3

V3

IIN3

IIP3

SELECTOR

INTERFACE

MON

MOP

PH2

PH1

PH3

PH / DIR

POWER

TO

PULSE

RATE

PROGRAM-

MABLE

ADDER

I1

V1

dr-01616

RA RE

IM