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ADE7953
The contents of the RENERGYA and RENERGYB registers are
updated synchronous to the CYCEND flag. The RENERGYA
and RENERGYB registers hold their current values until the
end of the next line cycle period, when the contents are replaced
with the new reading. If the read-with-reset bit (RSTREAD) in
the LCYCMODE register (Address 0x004) is set, the contents of
the RENERGYA and RENERGYB registers are cleared after a
read and remain at 0 until the end of the next line cycle period.
If a new value is written to the LINECYC register (Address 0x101)
midway through a line cycle accumulation, the new value is not
internally loaded until the end of a line cycle period. When the
LINECYC register is updated mid-reading, the current energy
accumulation cycle is completed, and the new value is then
programmed, ready for the next cycle. This prevents any invalid
readings due to changes to the LINECYC register (see Figure 47).
RENERGYx
NO-LOAD
THRESHOLD
REACTIVE POWER
NO-LOAD
THRESHOLD
NO-LOAD
Data Sheet
THRESHOLD
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.
REACTIVE ENERGY ACCUMULATION MODES
Signed Accumulation Mode
The default reactive energy accumulation mode for the ADE7953 is
a signed accumulation based on the reactive power information.
Antitamper Accumulation Mode
The ADE7953 includes an antitamper accumulation mode that
accumulates reactive energy depending on the sign of the active
power. When the active power is positive, the reactive power is
added to the reactive energy accumulation register. When the
active power is negative, the reactive power is subtracted from
the reactive energy accumulation register (see Figure 53).
Antitamper accumulation mode is disabled by default and can
be enabled on Current Channel A and Current Channel B by
setting the AVARACC and BVARACC bits to 01 in the ACCMODE
register (Address 0x201 and Address 0x301). If enabled, the
antitamper accumulation mode affects both reactive energy
accumulation registers, RENERGYA and RENERGYB, as well
as the CF output pins (see the Energy-to-Frequency Conversion
section).
ACTIVE POWER
NO-LOAD
THRESHOLD
Figure 53. Reactive Energy Accumulation in Antitamper Accumulation Mode
Absolute Accumulation Mode
The ADE7953 includes an absolute energy accumulation mode
for Current Channel A and Current Channel B reactive energy.
In absolute accumulation mode, the energy accumulation is done
using the absolute reactive power, ignoring any occurrences of
energy below the no-load threshold (see Figure 54).
RENERGYx
NO-LOAD
THRESHOLD
REACTIVE POWER
NO-LOAD
THRESHOLD
Figure 54. Reactive Energy Absolute Accumulation Mode
The absolute accumulation mode is disabled by default and
can be enabled on Current Channel A and Current Channel B
by setting the AVARACC and BVARACC bits to 10 in the
ACCMODE register (Address 0x201 and Address 0x301).
If enabled, the absolute accumulation mode affects both energy
accumulation registers, RENERGYA and RENERGYB, as well
as the CF output pins (see the Energy-to-Frequency Conversion
section).
Rev. B | Page 30 of 72
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