Three Phase Bidirectional Energy Metering IC

with Instantaneous Frequency Output

SPEC-3093 (REV. 2)

1/15

29-09-2017

SA4305A

FEATURES



Meets the IEC62053, CBIP-88 and IS137799-1999

specification requirements for Class 1 AC static watt-

hour meters for active energy



Pulse output supplies instantaneous active power

information



Bidirectional

three

phase

power

and

energy

measurement



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



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



Integrated anti-creep function per channel



Low power consumption (<40mW typical)



Measures AC inputs only



Functionally compatible with SA2005F

DESCRIPTION

The SA4305A is an accurate three phase power/energy

metering integrated circuit providing a single chip solution for

three phase energy metering. Very few external components

are required and the SA4305A does not require an external

crystal or voltage reference. A precision oscillator and a

precision voltage reference to supply the circuitry with a

stable frequency and stable reference currents are integrated

on the chip.

The SA4305A metering integrated circuit generates a pulse

output, the frequency of which is proportional to the

instantaneous active power consumption. The pulse output is

intended to interface with a microcontroller or similar pulse

counting circuitry.

The SA4305A includes an anti-creep feature preventing any

creep effects that affect meter accuracy under no-load or

missing phase conditions.

The SA4305A integrated circuit is available in a 20 pin small

outline (SOIC20) RoHS compliant package.

Figure 1: Block diagram

VREF

VSS

OSCILLATOR

AND

TIMING

VOLTAGE REFERENCE

AND

CURRENT BIASING

VOLTAGE

CHANNEL1

ADC

CURRENT

CHANNEL1

ADC

IIP1

POWER ON

RESET

Digital

Output

Instantaneous

power

SIGNAL PROCESSING

FOUT

PULSE

GENERATION

VDD

IIN1

IVP1

AGND

VOLTAGE

CHANNEL2

ADC

CURRENT

CHANNEL2

ADC

IIP2

IIN2

IVP2

VOLTAGE

CHANNEL3

ADC

CURRENT

CHANNEL3

ADC

IIP3

IIN3

IVP3

Digital

Output

Digital

Output

Digital

Output

Digital

Output

Digital

Output

DIR

PGM0

PGM1

ANTI

CREEP

ANTI

CREEP

ANTI

CREEP

FPM

ABS

ABS

ABS

MS