ADE7953 datasheet(27/68 Pages) AD

27 / 68 page

Data Sheet

ADE7953

Rev. A | Page 27 of 68

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

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).

NO-LOAD

THRESHOLD

ACTIVE POWER

NO-LOAD

THRESHOLD

AENERGYx

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).

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).

NO-LOAD

THRESHOLD

ACTIVE POWER

NO-LOAD

THRESHOLD

AENERGYx

Figure 50. Active 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 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).

ADE7953 数据表(PDF) 27 Page - Analog Devices

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