ADE7756 Analog Devices, ADE7756 Datasheet

ADE7756

Manufacturer Part Number

ADE7756

Description

Active Energy Metering IC with Serial Interface

Manufacturer

Analog Devices

Datasheet

1.ADE7756.pdf (32 pages)

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GENERAL DESCRIPTION

The ADE7756 is a high-accuracy electrical power measurement

IC with a serial interface and a pulse output. The ADE7756

incorporates two second-order sigma-delta ADCs, reference

circuitry, temperature sensor, and all the signal processing

required to perform active power and energy measurement.

U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; other pending.

V2P

V2N

V1N

V1P

PGA

REFERENCE

AGND

SENSOR

2.4V

TEMP

REF

FUNCTIONAL BLOCK DIAGRAM

ADC

IN/OUT

LPF1

MULTIPLIER

APGAIN[11:0]

RESET

DIN DOUT SCLK CS

PHCAL[5:0]

ADE7756 REGISTERS

SERIAL INTERFACE

HPF1

The ADE7756 contains a sampled Waveform register and an

Active Energy register capable of holding at least five seconds of

accumulated power at full load. Data is read from the ADE7756

via the serial interface. The ADE7756 also provides a pulse output

(CF) with a frequency that is proportional to the active power.

In addition to real power information, the ADE7756 also provides

system calibration features, i.e., channel offset correction, phase

calibration, and power calibration. The part also incorporates a

detection circuit for short duration low voltage variations or sags.

The voltage threshold level and the duration (in number of half-

line cycles) of the variation are user programmable. An open drain

logic output (SAG) goes active low when a sag event occurs.

A zero crossing output (ZX) produces an output that is synchro-

nized to the zero crossing point of the line voltage. This output can

be used to extract timing or frequency information from the line.

The signal is also used internally to the chip in the calibration

mode. This permits faster and more accurate calibration of the

real power calculation. This signal is also useful for synchronization

of relay switching with a voltage zero crossing, thus improving

the relay life by reducing the risk of arcing.

The interrupt request output is an open drain, active low logic

output. The IRQ output will become active when the accumu-

lated real power register is half-full and also when the register

overflows. A status register indicates the nature of the interrupt.

The ADE7756 is available in 20-lead DIP and 20-lead

SSOP packages.

AND

MULTIPLIER

IRQ

Active Energy Metering IC

LPF2

DGND

CLKIN

with Serial Interface

ADE7756

APOS[11:0]

CFDIV[11:0]

DFC

CLKOUT

SAG

ADE7756

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