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Power =
ADE7880
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
register.
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
register refer to the total active power of Phase x, the power type
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
Data Sheet
PHSIGN register is read immediately after reading the STATUS0
register. Next, the status bit is cleared and the IRQ0 pin is returned
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
(24)
dt
Conversely, energy is given as the integral of power, as follows:
Energy = ∫ p ( t ) dt (25)
Total and fundamental active energy accumulations are always
signed operations. Negative energy is subtracted from the active
energy contents.
HPFEN BIT
AIGAIN CONFIG3[0]
INTEN BIT
CONFIG[0]
IA
HPF
APGAIN
AWATTOS
REVAPA BIT IN
STATUS0[31:0]
APHCAL
VA
AVGAIN
HPFEN BIT
CONFIG3[0]
LPF
:
AWATT
INTERNAL
ACCUMULATOR
AWATTHR[31:0]
32-BIT REGISTER
HPF
DIGITAL SIGNAL PROCESSOR
2 4
THRESHOLD
34
WTHR
27 26
0
0
Figure 74. Total Active Energy Accumulation
Rev. A | Page 46 of 104
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