ADE7166 datasheet(62/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 62 of 144

POS

INTERRUPT STATUS REGISTERS

NEG

APSIGN FLAG

NO-LOAD

THRESHOLD

ACTIVE POWER

NO-LOAD

THRESHOLD

ACTIVE ENERGY

APNOLOAD

Line Cycle Active Energy Accumulation Mode

In line cycle active energy accumulation mode, the energy accumu-

lation of the ADE7566/ADE7569/ADE7166/ADE7169 can be

synchronized to the voltage channel zero crossing so that active

energy can be accumulated over an integral number of half-line

cycles. The advantage of summing the active energy over an

integer number of line cycles is that the sinusoidal component in

the active energy is reduced to 0. This eliminates any ripple in the

energy calculation. Energy is calculated more accurately and

more quickly because the integration period can be shortened.

By using this mode, the energy calibration can be greatly

simplified, and the time required to calibrate the meter can be

significantly reduced.

In the line cycle active energy accumulation mode, the

ADE7566/ADE7569/ADE7166/ADE7169 accumulate the active

power signal in the LWATTHR register for an integral number of

line cycles, as shown in Figure 69. The number of half-line cycles is

specified in the LINCYC register.

Figure 68. Energy Accumulation in Absolute Accumulation Mode

The ADE7566/ADE7569/ADE7166/ADE7169 can accumulate

active power for up to 65,535 half-line cycles. Because the active

power is integrated on an integral number of line cycles, the

CYCEND flag in the Interrupt Status 3 SFR (MIRQSTH, 0xDE) is

set at the end of an active energy accumulation line cycle. If the

CYCEND enable bit in the Interrupt Enable 3 SFR (MIRQENH,

0xDB) is set, the 8052 core has a pending ADE interrupt. The

ADE interrupt stays active until the CYCEND status bit is

cleared (see the

Active Energy Pulse Output

All of the ADE7566/ADE7569/ADE7166/ADE7169 circuitry has a

pulse output whose frequency is proportional to active power

(see the Active Power Calculation section). This pulse

frequency output uses the calibrated signal from the WGAIN

the active energy accumulation mode in the ACCMODE

preferably connected to an LED as shown in

Energy Measurement Interrupts section).

Another calibration cycle starts as soon as the CYCEND flag is

set. If the LWATTHR register is not read before a new CYCEND

flag is set, the LWATTHR register is overwritten by a new value.

Figure 79.

WDIV[7:0]

WATTOS[15:0]

WGAIN[11:0]

LPF1

LWATTHR[23:0]

ACTIVE ENERGY

IS ACCUMULATED IN

THE INTERNAL REGISTER,

AND THE LWATTHR

AT THE END OF THE LINCYC

HALF-LINE CYCLES

OUTPUT

FROM

LPF2

FROM VOLTAGE

CHANNEL

ADC

LINCYC[15:0]

ZERO-CROSSING

DETECTION

CALIBRATION

CONTROL

DIGITAL-TO-FREQUENCY

CONVERTER

Figure 69. Line Cycle Active Energy Accumulation

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