Single Phase Kilowatt-hour Metering IC

SPEC-1081 (REV. 2)

1/15

29-09-2017

SA4101A

FEATURES



Meets the IEC61036 specification requirements for

Class 1 AC static watt-hour meters for active energy



Less than 0.5% Error over a dynamic range of 1:500



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



Bidirectional and unidirectional energy measurement



Configurable for different meter ratings



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



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





Low power consumption (<25mW typical)



Measures AC inputs only

DESCRIPTION

The SA4101A 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 the device has direct drive capability for electro-

mechanical counters. The SA4101A does not require an

external crystal. A precision oscillator, which supplies the

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

SA4101A metering integrated circuit generates a pulse rate

output, the frequency of which is proportional to the power

consumption. The SA4101A 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 SA4101A for different meter maximum currents

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 SA4101A includes an anti-creep feature

preventing any creep effects in the meter. The SA4101A can

be configured for positive, negative or bidirectional energy

measurement.

The SA4101A integrated circuit is available in a 20 pin small

outline (SOIC20) RoHS compliant package.

Figure 1: Block diagram

VREF

VSS

MON

MOP

MOTOR

DRIVE

BUFFERS

DIVISION

FOR

COUNTER OUTPUT

OSCILLATOR

AND

TIMING

VOLTAGE REFERENCE

AND

CURRENT BIASING

VOLTAGE

CHANNEL

ADC

CURRENT

CHANNEL

ADC

AGND

IVP

IIN

IIP

VDD

DIGITAL

OUTPUT

DIGITAL

OUTPUT

Instantaneous

power

SIGNAL PROCESSING

Average

power

FAST

DIRI

SO

DIVISION

FOR

CALIBRATION

LED OUTPUT

LED

R0

R1

R2

DIRO

INTEGRATION

CNF