ADE7166_15 datasheet(65/152 Pages) AD

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ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569

Rev. B | Page 65 of

152

Figure 67 shows this energy accumulation for full-scale signals

(sinusoidal) on the analog inputs. The three displayed curves

illustrate the minimum period of time it takes the energy register

to roll over when the active power gain register contents are

0x7FF, 0x000, and 0x800. The watt gain register is used to carry

out power calibration in the ADE7116/ADE7156/ADE7166/

ADE7169/ADE7566/ADE7569. As shown, the fastest

integration time occurs when the watt gain register is set to

maximum full scale, that is, 0x7FF.

0x00,0000

0x7F,FFFF

0x3F,FFFF

0x40,0000

0x80,0000

WATTHR[23:0]

6.82

3.41

10.2

13.7

TIME (Minutes)

WGAIN = 0x7FF

WGAIN = 0x000

WGAIN = 0x800

Figure 67. Energy Register Rollover Time for Full-Scale Power

(Minimum and Maximum Power Gain)

Note that the energy register contents roll over to full-scale

negative (0x800000) and continue to increase in value when the

power or energy flow is positive (see Figure 67). Conversely, if

the power is negative, the energy register underflows to full-

scale positive (0x7FFFFF) and continues to decrease in value.

Using the interrupt enable register (MIRQENM, Address 0xDA),

the ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/

ADE7569 can be configured to issue an ADE interrupt to the

8052 core when the active energy register is half full (positive

or negative) or when an overflow or underflow occurs.

Integration Time Under Steady Load: Active Energy

As mentioned in the Active Energy Calculation section, the

discrete time sample period (T) for the accumulation register is

1.22 μs (5/MCLK). With full-scale sinusoidal signals on the

analog inputs and the WGAIN register (Address 0x1D) set to

0x000, the average word value from each LPF2 is 0xCCCCD

(see Figure 64). The maximum positive value that can be stored

in the internal 49-bit register is 248 (or 0xFFFF,FFFF,FFFF)

before it overflows. The integration time under these conditions

when WDIV = 0 is calculated in the following equation:

Time =

min

sec

409

xCCCCD

FFFF

FFFF,

xFFFF,

(16)

When WDIV is set to a value other than 0, the integration time

varies, as shown in Equation 17.

Time = TimeWDIV = 0 × WDIV

(17)

Active Energy Accumulation Modes

Watt-Signed Accumulation Mode

The ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/

ADE7569 active energy default accumulation mode is a watt-

signed accumulation based on the active power information.

Watt Positive-Only Accumulation Mode

The ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/

ADE7569 are placed in watt positive-only accumulation mode

by setting the POAM bit (Bit 1) in the ACCMODE register

(Address 0x0F). In this mode, the energy accumulation is done

only for positive power, ignoring any occurrence of negative

power above or below the no load threshold (see Figure 68).

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 detection of

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 68. Energy Accumulation in Positive-Only Accumulation Mode

Watt-Absolute Accumulation Mode

The ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/

ADE7569 are placed in watt-absolute accumulation mode by

setting the ABSAM bit (Bit 0) in the ACCMODE register

(Address 0x0F). In this mode, the energy accumulation is done

using the absolute active power, ignoring any occurrence of

power below the no load threshold (see Figure 69). 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 detection of no

load threshold are active in this mode.

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