ADE7566 datasheet(72/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 72 of 144

ENERGY REGISTER SCALING

The ADE7566/ADE7569/ADE7166/ADE7169 provide

measurements of active, reactive, and apparent energies that use

separate paths and filtering for calculation. The difference in

data paths can result in small differences in LSB weight between

active, reactive, and apparent energy registers. These

measurements are internally compensated so the scaling is nearly

one to one. The relationship between these registers is shown in

Table 46.

Table 46. Energy Registers Scaling

Line Frequency = 50 Hz

Line Frequency = 60 Hz

Integrator

VAR = 0.9952 × WATT

VAR = 0.9949 × WATT

Off

VA = 0.9978 × WATT

VA = 1.0015 × WATT

Off

VAR = 0.9997 × WATT

VAR = 0.9999 × WATT

VA = 0.9977 × WATT

VA = 1.0015 × WATT

ENERGY MEASUREMENT INTERRUPTS

The energy measurement part of the ADE7566/ADE7569/

ADE7166/ADE7169 has its own interrupt vector for the 8052

core, Vector Address 0x004B (see the Interrupt Vectors section).

The bits set in the Interrupt Enable 1 SFR (MIRQENL, 0xD9),

Interrupt Enable 2 SFR (MIRQENM, 0xDA), and Interrupt

Enable 3 SFR (MIRQENH, 0xDB) enable the energy

measurement interrupts that are allowed to interrupt the 8052

core. If an event is not enabled, it cannot create a system

interrupt.

The ADE interrupt stays active until the status bit that has created

the interrupt is cleared. The status bit is cleared when a zero is

written to this register bit.

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