FEATURES

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Provides a single chip solution for energy meters with a

mechanical display

No external crystal or resonator required

Precision on chip oscillator (<60ppm/°C drift)

Direct stepper motor/impulse counter drive

Calibration and setup stored on external EEPROM - no

trimpots required

Flexible programmable features

Unidirectional and bi-directional power and energy

measurement

sames

Programmable Single Phase Kilowatt-hour

Energy IC for Mechanical Counter

Application

SA2002P

1/14

SPEC-0087 (REV. 5)

05-09-02

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Can measure AC or DC energy.

Meets the IEC 61036 Specification for Class 1 AC Watt

hour meters

Less than 1% error over a dynamic range of 1:1000

Protected against ESD

Total power consumption rating below 30mW

Adaptable to different types of sensors

Operates over a wide temperature range

Precision voltage reference on-chip (<100ppm/°C drift)

DESCRIPTION

The SAMES SA2002P provides a single chip solution for

single phase mechanical counter based energy meters. A

precision oscillator, that replaces an external crystal is

integrated on chip.

The SA2002P does not require any external trim-pots. All

required calibration and configuration data is read from a small

external EEPROM. The data stored in the EEPROM consists

of direction mode (unidirectional or bidirectional), calibration

data, meter rated conditions, LED pulse rate, counter pulse

width, counter resolution and creep threshold. A

programmable high frequency pulse output is available on the

LED output for meter calibration purposes.

The SA2002P single phase kWh metering integrated circuit

generates a pulse rate with a frequency proportional to the

power consumption. The SA2002P performs active power

measurement and takes the power factor into account.

The SA2002P integrated circuit is available in 16 pin dual-in-

line plastic (PDIP16) and small outline (SOIC16) package

types.

Figure 1: Block diagram

IIP

IIN

IVP

GND

VREF

DR-01607

POWER

TO

PULSE RATE

DIRO

V

DD

V

SS

POWER

INTEGRATOR

ANALOG

SIGNAL

PROCESSING

TIMING

OSC

VOLTAGE

REF.

IIC BUS

INTERFACE

LED

MOP

MON

RLOAD

TEST

SCL

SDA

FMO