ADE75 datasheet(57/148 Pages) AD

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Preliminary Technical Data

ADE75xx/ADE71xx

Rev. PrE | Page 57 of 148

ACCMODE register (0x0F). In positive-only accumulation

mode, the energy accumulation is done only for positive power,

ignoring any occurrence of negative power above or below the

no-load threshold, as shown in Figure 41. The CF pulse also

reflects this accumulation method when in this mode. The

default setting for this mode is off. Detection of the transitions

in the direction of power flow, and no-load threshold are active

in this mode.

POS

INTERRUPT STATUS REGISTERS

NEG

APSIGN Flag

NO-LOAD

THRESHOLD

ACTIVE POWER

NO-LOAD

THRESHOLD

ACTIVE ENERGY

Figure 41. Energy Accumulation in Positive-Only Accumulation Mode

Watt absolute accumulation mode

The ADE75XX/ADE71XX is placed in absolute accumulation

mode by setting the ABSAM bit in the ACCMODE register

(0x0F). In absolute accumulation mode, the energy

accumulation is done using the absolute active power, ignoring

any occurrence of power below the no-load threshold, as shown

in Figure 42. The CF pulse also reflects this accumulation

method when in this mode. The default setting for this mode is

off. Detection of the transitions in the direction of power flow,

and no-load threshold are active in this mode.

POS

INTERRUPT STATUS REGISTERS

NEG

APSIGN Flag

NO-LOAD

THRESHOLD

ACTIVE POWER

NO-LOAD

THRESHOLD

ACTIVE ENERGY

APNOLOAD

Figure 42. Energy Accumulation in Absolute Accumulation Mode

Active energy Pulse output

ADE75XX/ADE71XX also provides all the circuitry to have a

pulse output that frequency is proportional to Active power –

see Active Power Calculation section. This pulse frequency

output uses the calibrated signal after WGAIN and its behavior

is consistent with the setting of the active energy accumulation

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

active low and should be preferably connected to an LED as

shown on Figure 53.

Line cycle active energy accumulation mode

In line cycle energy accumulation mode, the energy accumula-

tion of the ADE75XX/ADE71XX 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 in

a shorter time because the integration period can be shortened.

By using the line cycle energy accumulation mode, the energy

calibration can be greatly simplified, and the time required to

calibrate the meter can be significantly reduced. In line cycle

energy accumulation mode, the ADE75XX/ADE71XX

accumulates the active power signal in the LWATTHR register

for an integral number of line cycles, as shown in Figure 44. The

number of half line cycles is specified in the LINCYC register.

The ADE75XX/ADE71XX 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, at the end of a line cycle

energy accumulation cycle the CYCEND flag in the Interrupt

Status Register 3 SFR (MIRQSTH, 0xDE) is set. If the CYCEND

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

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