ADE7978 datasheet(3/120 Pages) AD

3 / 120 page

Data Sheet

ADE7978/ADE7933/ADE7932

Rev. 0 | Page 3 of 120

Synchronizing Energy Registers with the CFx Outputs ........69

Energy Registers and CFx Outputs for Various

Accumulation Modes .................................................................70

Sign of Sum of Phase Powers in the CFx Datapath ................72

No Load Condition .........................................................................73

No Load Detection Based on Total Active

and Reactive Powers ...................................................................73

No Load Detection Based on Fundamental

Active and Reactive Powers .......................................................73

No Load Detection Based on Apparent Power .......................74

Interrupts..........................................................................................75

Using the Interrupts with an MCU...........................................76

Power Management.........................................................................77

DC-to-DC Converter .................................................................77

Magnetic Field Immunity ..........................................................78

Power-Up Procedure ..................................................................79

Initializing the Chipset...............................................................79

Hardware Reset............................................................................80

ADE7978/ADE7933/ADE7932 Chipset Software Reset........81

ADE7933/ADE7932 Software Reset.........................................81

Low Power Mode.........................................................................81

Applications Information...............................................................82

ADE7978 and ADE7933/ADE7932 in Polyphase

Energy Meters..............................................................................82

ADE7978 Quick Setup as an Energy Meter ............................85

Bit Stream Communication Between the ADE7978

and the ADE7933/ADE7932 .....................................................86

ADE7978 and ADE7933/ADE7932 Clocks.............................87

Insulation Lifetime......................................................................87

Layout Guidelines .......................................................................88

ADE7978 and ADE7933/ADE7932 Evaluation Board ..........90

ADE7978 Die Version ................................................................90

Serial Interfaces ...............................................................................91

Serial Interface Selection............................................................91

Communication Verification ....................................................91

I2C-Compatible Interface...........................................................91

SPI-Compatible Interface...........................................................94

HSDC Interface...........................................................................96

Checksum Register .....................................................................98

Outline Dimensions......................................................................118

Ordering Guide .........................................................................118

REVISION HISTORY

11/13—Revision 0: Initial Version

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