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ADE7880
converter. In this mode, the CFx pulses synchronize perfectly
with the active energy accumulated in xWATTHR registers because
the powers are accumulated in the same way in both data paths.
Figure 92 shows how absolute active power accumulation works.
ACTIVE ENERGY
Data Sheet
ACTIVE ENERGY
NO-LOAD
THRESHOLD
ACTIVE POWER
NO-LOAD
THRESHOLD
NO-LOAD
THRESHOLD
ACTIVE POWER
NO-LOAD
THRESHOLD
REVAPx BIT
IN STATUS0
xWSIGN BIT
IN PHSIGN
REVAPx BIT
IN STATUS0
APNOLOAD
SIGN = POSITIVE
POS
NEG POS
NEG
xWSIGN BIT
IN PHSIGN
Figure 92. Active Power Absolute Accumulation Mode
APNOLOAD
SIGN = POSITIVE
POS
NEG POS NEG
Figure 91. Active Power Positive Only Accumulation Mode
Bits[3:2] (VARACC[1:0]) in the ACCMODE register determine the
accumulation modes of the fundamental reactive powers when
signals proportional to the fundamental reactive powers are
chosen at the CFx pins (the CFxSEL[2:0] bits in the CFMODE
register equal 100). When VARACC[1:0] = 00, the default value,
the fundamental reactive powers are sign accumulated in the
var-hour energy registers and before entering the energy-to-
frequency converter. Figure 93 shows how signed fundamental
reactive power accumulation works. In this mode, the CFx
pulses synchronize perfectly with the fundamental reactive
energy accumulated in the xFVARHR registers because the
powers are sign accumulated in both data paths.
REACTIVE
ENERGY
NO-LOAD
THRESHOLD
REACTIVE
POWER
NO-LOAD
THRESHOLD
REVRPx BIT
IN STATUS0
xVARSIGN BIT
IN PHSIGN
VARACC[1:0] = 01 setting is reserved and ADE7880 behaves
VARNOLOAD
SIGN = POSITIVE
POS
NEG POS
NEG
identically to the case when VARACC[1:0] = 00.
When VARACC[1:0] = 10, the fundamental reactive powers are
accumulated depending on the sign of the corresponding active
power in the var-hour energy registers and before entering the
energy-to-frequency converter. If the fundamental active power
is positive or considered 0 when lower than the no load threshold,
the fundamental reactive power is accumulated as is. If the
fundamental active power is negative, the sign of the fundamental
reactive power is changed for accumulation. Figure 94 shows how
the sign adjusted fundamental reactive power accumulation
mode works. In this mode, the CFx pulses synchronize perfectly
with the fundamental reactive energy accumulated in xFVARHR
registers because the powers are accumulated in the same way in
both data paths.
Figure 93. Fundamental Reactive Power Signed Accumulation Mode
When VARACC[1:0] = 11, the fundamental reactive powers are
accumulated in absolute mode. When the powers are negative,
they change sign and accumulate together with the positive
power in the var-hour registers. CFx pulses are generated based
on signed accumulation mode. In this mode, the CFx pulses do
not synchronize perfectly with the fundamental reactive energy
accumulated in x VARHR registers because the powers are
accumulated differently in each data path. Figure 95 shows how
absolute fundamental reactive power accumulation works.
Sign of Sum-of-Phase Powers in the CFx Datapath
The ADE7880 has sign detection circuitry for the sum of phase
powers that are used in the CFx data path. As seen in the
beginning of the Energy-to-Frequency Conversion section, the
energy accumulation in the CFx data path is executed in two
stages. Every time a sign change is detected in the energy
accumulation at the end of the first stage, that is, after the
Rev. A | Page 68 of 104
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