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Data Sheet
xWGAIN
xWATTOS
ADE7953
OUTPUT FROM
+
+
48
INTERNAL
0
LPF2
ACCUMULATION
FIXED INTERNAL
THRESHOLD
OUTPUT FROM
VOLTAGE CHANNEL
ADC
LPF1
ZERO-CROSSING
DETECTION
CALIBRATION
CONTROL
23
AENERGYx
0
15
LINECYC
0
Figure 48. Active Energy Line Cycle Accumulation
Note that when line cycle accumulation mode is first enabled, the
reading after the first CYCEND flag should be ignored because
it may be inaccurate. This is because the line cycle accumulation
mode is not synchronized to the zero crossing and, therefore,
the first reading may not be over a complete number of half line
cycles. After the first line cycle accumulation is complete, all
successive readings will be correct.
ACTIVE ENERGY ACCUMULATION MODES
Signed Accumulation Mode
The default active energy accumulation mode for the ADE7953 is
a signed accumulation based on the active power information.
Positive-Only Accumulation Mode
If enabled, the positive-only accumulation mode affects both
energy accumulation registers, AENERGYA and AENERGYB,
as well as the CF output pins (see the Energy-to-Frequency
Conversion section). Note that when the positive-only accumu-
lation mode is enabled on a current channel, the reverse power
feature is not available on that current channel (see the Reverse
Power section).
Absolute Accumulation Mode
The ADE7953 includes an absolute energy accumulation mode
for Current Channel A and Current Channel B active energy. In
absolute accumulation mode, the energy accumulation is done
using the absolute active power, ignoring any occurrences of
energy below the no-load threshold (see Figure 50).
The ADE7953 includes a positive-only accumulation mode
option for Current Channel A and Current Channel B active
energy. In positive-only accumulation mode, the energy
accumulation is done only for positive power, ignoring any
occurrence of negative power above or below the no-load
threshold (see Figure 49).
AENERGYx
NO-LOAD
THRESHOLD
AENERGYx
NO-LOAD
ACTIVE POWER
NO-LOAD
THRESHOLD
Figure 50. Active Energy Absolute Accumulation Mode
THRESHOLD
The absolute accumulation mode is disabled by default and can
ACTIVE POWER
NO-LOAD
THRESHOLD
Figure 49. Positive-Only Accumulation Mode
The positive-only accumulation mode is disabled by default and
can be enabled on Current Channel A and Current Channel B
by setting the AWATTACC and BWATTACC bits to 01 in the
ACCMODE register (Address 0x201 and Address 0x301).
be enabled on Current Channel A and Current Channel B by
setting the AWATTACC and BWATTACC bits to 10 in the
ACCMODE register (Address 0x201 and Address 0x301).
If enabled, the absolute accumulation mode affects both energy
accumulation registers, AENERGYA and AENERGYB, as well
as the CF output pins (see the Energy-to-Frequency Conversion
section). Note that when the absolute accumulation mode is
enabled on a current channel, the reverse power feature is not
available on that current channel (see the Reverse Power section).
Rev. B | Page 27 of 72
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