ADE7753ARSZ datasheet(37/60 Pages) AD

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ADE7753

Rev. C | Page 37 of 60

overflows. Therefore, the integration time under these conditions

with VADIV = 0 is calculated as follows:

LINE APPARENT ENERGY ACCUMULATION

Time =

055

FFFF

FFFF,

xFFFF,

× 1.2 μs = 888 s = 12.52 min(32)

When VADIV is set to a value different from 0, the integration

time varies, as shown in Equation 33.

Time = TimeWDIV = 0 × VADIV

(33)

The ADE7753 is designed with a special apparent energy

accumulation mode, which simplifies the calibration process.

By using the on-chip zero-crossing detection, the ADE7753

accumulates the apparent power signal in the LVAENERGY

Figure 77. The line apparent energy accumulation mode is

always active.

The number of half line cycles is specified in the LINECYC

accumulate apparent power for up to 65535 combined half

cycles. Because the apparent power is integrated on the same

integral number of line cycles as the line active energy register,

these two values can be compared easily. The active energy and

the apparent energy are calculated more accurately because of

this precise timing control and provide all the information

needed for reactive power and power factor calculation. At the

end of an energy calibration cycle, the CYCEND flag in the

interrupt status register is set. If the CYCEND mask bit in the

interrupt mask register is enabled, the IRQ output also goes

active low. Thus the IRQ line can also be used to signal the end

of a calibration.

The line apparent energy accumulation uses the same signal

path as the apparent energy accumulation. The LSB size of these

two registers is equivalent.

VADIV[7:0]

LPF1

LVAENERGY [23:0]

LVAENERGY REGISTER IS

UPDATED EVERY LINECYC

ZERO CROSSINGS WITH THE

TOTAL APPARENT ENERGY

DURING THAT DURATION

APPARENT

POWER

FROM

CHANNEL 2

ADC

LINECYC [15:0]

02875-0-076

ZERO-CROSSING

DETECTION

CALIBRATION

CONTROL

Figure 77. ADE7753 Apparent Energy Calibration

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