ADE7953 datasheet(41/68 Pages) AD

41 / 68 page

Data Sheet

ADE7953

Rev. A | Page 41 of 68

Active Energy No-Load Status Bits

In addition to the active energy no-load interrupt, the ADE7953

includes two unlatched status bits that continually monitor the

no-load status of Current Channel A and Current Channel B.

The ACTNLOAD_A and ACTNLOAD_B bits are located in the

ACCMODE register (Address 0x201 and Address 0x301). These

bits differ from the interrupt status bits in that they are unlatched

and can, therefore, be used to drive an LED.

REACTIVE ENERGY NO-LOAD DETECTION

Reactive energy no-load detection can be used in conjunction

with active energy no-load detection to establish a “true” no-load

feature. If both the reactive and active energy fall below the no-load

threshold, there is no resistive, inductive, or capacitive load. The

reactive energy no-load feature can also be used to prevent creep

of the reactive energy when there is a resistive load present.

If the reactive energy on either Current Channel A (phase) or

Current Channel B (neutral) falls below the programmed thresh-

old, the reactive energy on that channel ceases to accumulate in

the RENERGYA and RENERGYB registers, respectively. If either

the CF1 or CF2 pin is programmed to output reactive energy, the

CF output is disabled and held high (see the Energy-to-Frequency

Conversion section). If enabled, the reactive reverse power indi-

cation holds its current state while in the no-load condition (see

the Reverse Power section). The Current Channel A reactive

energy no-load condition is indicated by the VAR_NOLOADA

bit (Bit 7) in the IRQSTATA register (Address 0x22D and

Address 0x32D). The Current Channel B reactive energy no-

load condition is indicated by the VAR_NOLOADB bit (Bit 7)

in the IRQSTATB register (Address 0x230 and Address 0x330).

Current Channel A and Current Channel B are independent

and, therefore, a no-load condition on Current Channel A

affects only the energy accumulation, CF output, and reverse

power of Current Channel A, and vice versa.

The reactive energy no-load feature is enabled by default and

can be disabled by setting Bit 1 in the DISNOLOAD register

(Address 0x001) to 1.

Reactive Energy No-Load Interrupt

Two interrupts are associated with the reactive energy no-load

feature: one for Current Channel A (phase) and one for Current

Channel B (neutral). If enabled, these interrupts are triggered

when the reactive energy falls below the programmed threshold.

The Current Channel A reactive energy no-load interrupt can be

enabled by setting the VAR_NOLOADA bit (Bit 7) in the IRQENA

a reactive energy no-load event on Current Channel A causes

the IRQ pin (Pin 22) to fall to 0 (see the

section).

Primary Interrupts

(Voltage Channel and Current Channel A)

The Current Channel B reactive energy no-load interrupt can be

enabled by setting the VAR_NOLOADB bit (Bit 7) in the IRQENB

reactive power no-load event on Current Channel B triggers the

IRQ alternative output (see the

section).

Current Channel B Interrupts

Reactive Energy No-Load Status Bits

In addition to the reactive energy no-load interrupt, the

ADE7953 includes two unlatched status bits that continually

monitor the no-load status of Current Channel A and Current

Channel B. The VARNLOAD_A and VARNLOAD_B bits are

located in the ACCMODE register (Address 0x201 and Address

0x301). These bits differ from the interrupt status bits in that

they are unlatched and can, therefore, be used to drive an LED.

APPARENT ENERGY NO-LOAD DETECTION

Apparent energy no-load detection can be used to determine

whether the total consumed energy is below the no-load thresh-

old. If the apparent energy on either Current Channel A (phase)

or Current Channel B (neutral) falls below the programmed

threshold, the apparent energy on that channel ceases to

accumulate in the APENERGYA and APENERGYB registers,

respectively. If either the CF1 or CF2 pin is programmed to

output apparent energy, the CF output is disabled and held high

(see the Energy-to-Frequency Conversion section). The Current

Channel A apparent energy no-load condition is indicated by the

VA_NOLOADA bit (Bit 8) in the IRQSTATA register (Address

0x22D and Address 0x32D). The Current Channel B apparent

energy no-load condition is indicated by the VA_NOLOADB

bit (Bit 8) in the IRQSTATB register (Address 0x230 and

Address 0x330).

Current Channel A and Current Channel B are independent

and, therefore, a no-load condition on Current Channel A

affects only the energy accumulation and CF output of Current

Channel A, and vice versa.

The apparent energy no-load feature is enabled by default and

can be disabled by setting Bit 2 in the DISNOLOAD register

(Address 0x001) to 1.

Apparent Energy No-Load Interrupt

Two interrupts are associated with the apparent energy no-load

feature: one for Current Channel A (phase) and one for Current

Channel B (neutral). If enabled, these interrupts are triggered when

the apparent energy falls below the programmed threshold.

The Current Channel A apparent energy no-load interrupt can be

enabled by setting the VA_NOLOADA bit (Bit 8) in the IRQENA

an apparent energy no-load event on Current Channel A causes

the IRQ pin (Pin 22) to fall to 0 (see the

section).

Primary Interrupts

(Voltage Channel and Current Channel A)

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