ADE5169 datasheet(61/148 Pages) AD

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ADE5166/ADE5169

Rev. 0 | Page 61 of 148

Var Antitamper Accumulation Mode

The ADE5169 is placed in var antitamper accumulation mode

by setting the SAVARM bit in the ACCMODE register

(Address 0x0F). In this mode, the reactive power is accumulated

depending on the sign of the active power. When the active

power is positive, the reactive power is added as it is to the reactive

energy register. When the active power is negative, the reactive

power is subtracted from the reactive energy accumulator (see

Figure 68). The CF pulse also reflects this accumulation method

when in this mode. The default setting for this mode is off. Transi-

tions in the direction of power flow and no load threshold are

active in this mode.

POS

INTERRUPT STATUS REGISTERS

NEG

APSIGN FLAG

ACTIVE POWER

NO LOAD

THRESHOLD

NO LOAD

THRESHOLD

REACTIVE ENERGY

NO LOAD

THRESHOLD

REACTIVE POWER

NO LOAD

THRESHOLD

Figure 68. Reactive Energy Accumulation in

Antitamper Accumulation Mode

Var Absolute Accumulation Mode

The ADE5169 is placed in absolute accumulation mode by

setting the ABSVARM bit (Bit 3) in the ACCMODE register

(Address 0x0F). In absolute accumulation mode, the reactive

energy accumulation is done by using the absolute reactive

power and ignoring any occurrence of power below the no load

threshold for the reactive energy (see Figure 69). The CF pulse

also reflects this accumulation method when in the absolute

accumulation mode. The default setting for this mode is off.

Transitions in the direction of power flow and no load threshold

are active in this mode.

REACTIVE ENERGY

NO LOAD

THRESHOLD

NO LOAD

THRESHOLD

REACTIVE POWER

Figure 69. Reactive Energy Accumulation in Absolute Accumulation Mode

Reactive Energy Pulse Output

The ADE5169 provides all the circuitry with a pulse output

whose frequency is proportional to reactive power (see the

Energy-to-Frequency Conversion section). This pulse frequency

output uses the calibrated signal after VARGAIN, and its behavior

is consistent with the setting of the reactive energy accumulation

mode in the ACCMODE register (Address 0x0F). The pulse

output is active low and should preferably be connected to an LED,

as shown in Figure 75.

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