ADE7932 datasheet(4/120 Pages) AD

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ADE7978/ADE7933/ADE7932

Data Sheet

Rev. 0 | Page 4 of 120

GENERAL DESCRIPTION

The ADE7978 and the ADE7933/ADE7932 form a chipset

dedicated to measuring 3-phase electrical energy using shunts

as current sensors.

The ADE7933/ADE7932 are isolated, 3-channel sigma-delta

analog-to-digital converters (Σ-Δ ADCs) for polyphase energy

metering applications that use shunt current sensors. The

ADE7932 features two 24-bit ADCs, and the ADE7933 features

three 24-bit ADCs. One channel is dedicated to measuring the

voltage across the shunt when a shunt is used for current sensing.

This channel provides a signal-to-noise ratio (SNR) of 67 dB over

a 3.3 kHz signal bandwidth. Up to two additional channels are

dedicated to measuring voltages, which are usually sensed using

resistor dividers. These channels provide an SNR of 75 dB over

a 3.3 kHz signal bandwidth. One voltage channel can be used to

measure the temperature of the die via an internal sensor. The

ADE7933 includes three channels: one current channel and two

voltage channels. The ADE7932 includes one current channel and

one voltage channel, but is otherwise identical to the ADE7933.

The ADE7933/ADE7932 include isoPower®, an integrated,

isolated dc-to-dc converter. Based on the Analog Devices, Inc.,

Coupler® technology, the dc-to-dc converter provides the regu-

lated power required by the first stage of the ADCs at a 3.3 V

input supply. The ADE7933/ADE7932 eliminate the need for an

external dc-to-dc isolation block. The iCoupler chip scale trans-

former technology is used to isolate the logic signals between the

first and second stages of the ADC. The result is a small form

factor, total isolation solution.

The ADE7933/ADE7932 contain a digital interface that is specially

designed to interface with the ADE7978. Using this interface, the

ADE7978 accesses the ADC outputs and configuration settings

of the ADE7933/ADE7932.

The ADE7933/ADE7932 are available in a 20-lead, Pb-free, wide-

body SOIC package with increased creepage.

The ADE7978 is a high accuracy, 3-phase electrical energy

measurement IC with serial interfaces and three flexible pulse

outputs. The ADE7978 can interface with up to four ADE7933/

ADE7932 devices. The ADE7978 incorporates all the signal

processing required to perform total (fundamental and harmonic)

active, reactive, and apparent energy measurement and rms

calculations, as well as fundamental-only active and reactive

energy measurement and rms calculations. A fixed function

digital signal processor (DSP) executes this signal processing.

The ADE7978 measures the active, reactive, and apparent energy

in various 3-phase configurations, such as wye or delta services,

with both three and four wires. The ADE7978 provides system

calibration features for each phase, gain calibration, and optional

offset correction. Phase compensation is also available, but it is

not necessary because the currents are sensed using shunts. The

CF1, CF2, and CF3 logic outputs provide a wide selection of

power information: total active, reactive, and apparent powers;

the sum of the current rms values; and fundamental active and

reactive powers.

The ADE7978 incorporates power quality measurements, such

as short duration low or high voltage detection, short duration

high current variations, line voltage period measurement, and

angles between phase voltages and currents. Two serial interfaces,

SPI and I2C, can be used to communicate with the ADE7978.

A dedicated high speed interface—the high speed data capture

(HSDC) port—can be used in conjunction with I2C to provide

access to the ADC outputs and real-time power information.

The ADE7978 also has two interrupt request pins, IRQ0 and

IRQ1, to indicate that an enabled interrupt event has occurred.

The ADE7978 is available in a 28-lead, Pb-free LFCSP package.

Note that throughout this data sheet, multifunction pins, such

as SCLK/SCL, are referred to by the entire pin name or by a

single function of the pin, for example, SCLK, when only that

function is relevant.

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