ADE7880 datasheet(46/104 Pages) AD

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ADE7880

Data Sheet

Rev. A | Page 46 of 104

Bits[8:6] (REVAPC, REVAPB, and REVAPA, respectively) in the

STATUS0 register are set when a sign change occurs in the

power selected by Bit 6 (REVAPSEL) in the ACCMODE

Bits[2:0] (CWSIGN, BWSIGN, and AWSIGN, respectively) in

the PHSIGN register are set simultaneously with the REVAPC,

REVAPB, and REVAPA bits. They indicate the sign of the

power. When they are 0, the corresponding power is positive.

When they are 1, the corresponding power is negative.

Bit REVAPx of STATUS0 and Bit xWSIGN in the PHSIGN

being selected by Bit 6 (REVAPSEL) in the ACCMODE register.

Interrupts attached to Bits[8:6] (REVAPC, REVAPB, and

REVAPA, respectively) in the STATUS0 register can be enabled

by setting Bits[8:6] in the MASK0 register. If enabled, the IRQ0

pin is set low, and the status bit is set to 1 whenever a change of

sign occurs. To find the phase that triggered the interrupt, the

PHSIGN register is read immediately after reading the STATUS0

to high by writing to the STATUS0 register with the corresponding

bit set to 1.

Active Energy Calculation

As previously stated, power is defined as the rate of energy flow.

This relationship can be expressed mathematically as

dEnergy

Power =

(24)

Conversely, energy is given as the integral of power, as follows:

()dt

Energy

∫

(25)

Total and fundamental active energy accumulations are always

signed operations. Negative energy is subtracted from the active

energy contents.

INTERNAL

ACCUMULATOR

THRESHOLD

HPFEN BIT

CONFIG3[0]

HPF

DIGITAL SIGNAL PROCESSOR

AIGAIN

AVGAIN

HPFEN BIT

CONFIG3[0]

INTEN BIT

CONFIG[0]

HPF

LPF

APGAIN AWATTOS

APHCAL

AWATT

WTHR

27 26

32-BIT REGISTER

AWATTHR[31:0]

REVAPA BIT IN

STATUS0[31:0]

Figure 74. Total Active Energy Accumulation

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