ADE7953 datasheet(30/68 Pages) AD

30 / 68 page

ADE7953

Data Sheet

Rev. A | Page 30 of 68

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).

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

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).

NO-LOAD

THRESHOLD

ACTIVE POWER

REACTIVE POWER

NO-LOAD

THRESHOLD

NO-LOAD

THRESHOLD

NO-LOAD

THRESHOLD

RENERGYx

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).

NO-LOAD

THRESHOLD

REACTIVE POWER

NO-LOAD

THRESHOLD

RENERGYx

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).

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