ADE7880 datasheet(61/104 Pages) AD

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Data Sheet

ADE7880

Rev. A | Page 61 of 104

AIRMSOS

BIRMSOS

CIRMSOS

HPHASE BITS

HCONFIG[2, 1] SELECT THE

PHASE BEING MONITORED

AVRMSOS

BVRMSOS

CVRMSOS

HPHASE BITS

HCONFIG[2, 1] SELECT THE

PHASE BEING MONITORED

FIRMS

HPHASE BITS

HCONFIG[2, 1] SELECT THE

GAIN BEING USED

APGAIN OR

BPGAIN OR

CPGAIN

FVA

FVRMS

Figure 83. Fundamental RMS Signal Processing

The active, reactive, and apparent powers of the fundamental

component are stored into the FWATT, FVAR, and FVA 24-bit

signed registers. Figure 85 presents the associated data path.

The active, reactive and apparent powers of the 3 harmonic

components are stored into the HXWATT, HXVAR, HXVA,

HYWATT, HYVAR, HYVA, HZWATT, HZVAR, and HZVA

24-bit signed registers. Figure 86 presents the associated data path.

The power factor of the fundamental component is stored into

FPF 24-bit signed register. The power factors of the three

harmonic components are stored into the HXPF, HYPF, and

HZPF 24-bit signed registers.

The total harmonic distortion ratios computed using the rms of

the fundamental components and the rms of the phase current

and the phase voltage (see Root Mean Square Chapter for

details about these measurements) are stored into the VTHD

and ITHD 24-bit registers in 3.21 signed format. This means

the ratios are limited to +3.9999 and all greater results are

clamped to it.

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