ADE7923 datasheet(3/125 Pages) AD

3 / 125 page

Data Sheet

ADE7978/ADE7933/ADE7932/ADE7923

Rev. D | Page 3 of 125

Energy-to-Frequency Conversion.................................................73

TERMSELx[2:0] Bits...................................................................73

CFxSEL[2:0] Bits .........................................................................73

Energy-to-Frequency Conversion Process ..............................74

Synchronizing Energy Registers with the CFx Outputs ........74

Energy Registers and CFx Outputs for Various Accumulation

Modes ...........................................................................................75

Sign of Sum of Phase Powers in the CFx Datapath ................77

No Load Condition .........................................................................78

No Load Detection Based on Total Active and Reactive

Powers...........................................................................................78

No Load Detection Based on Fundamental Active and

Reactive Powers...........................................................................78

No Load Detection Based on Apparent Power .......................79

Interrupts..........................................................................................80

Using the Interrupts with an MCU...........................................81

Power Management.........................................................................82

DC-to-DC Converter .................................................................82

Magnetic Field Immunity ..........................................................83

Power-Up Procedure ..................................................................84

Initializing the Chipset...............................................................84

Hardware Reset............................................................................85

ADE7978/ADE7933/ADE7932 and ADE7923 Chipset

Software Reset..............................................................................86

ADE7933/ADE7932 and ADE7923 Software Reset...............86

Low Power Mode ........................................................................86

Applications Information...............................................................87

Differences Between the ADE7923 and the

ADE7933/ADE7932 ...................................................................87

ADE7978, ADE7933/ADE7932 and ADE7923 in Polyphase

Energy Meters..............................................................................87

ADE7978 Quick Setup as an Energy Meter ............................90

Bit Stream Communication Between the ADE7978 and the

ADE7933/ADE7932 and ADE7923..........................................91

ADE7978, ADE7933/ADE7932, and ADE7923 Clocks ........92

Insulation Lifetime......................................................................92

Layout Guidelines .......................................................................93

ADE7978 and ADE7933/ADE7932 Evaluation Board ..........96

ADE7978 Die Version ................................................................96

Serial Interfaces ...............................................................................97

Serial Interface Selection............................................................97

Communication Verification ....................................................97

I2C-Compatible Interface...........................................................97

SPI-Compatible Interface.........................................................100

HSDC Interface.........................................................................102

Checksum Register ...................................................................104

Outline Dimensions......................................................................124

Ordering Guide .........................................................................125

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