ADE7166 datasheet(61/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 61 of 144

Figure 66 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 ADE7566/ADE7569/ADE7166/

ADE7169. As shown, the fastest integration time occurs when

the watt gain register is set to maximum full scale, that is,

0x7FF.

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 ADE7566/ADE7569/ADE7166/ADE7169 active energy

default accumulation mode is a watt-signed accumulation based

on the active power information.

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

Watt Positive-Only Accumulation Mode

The ADE7566/ADE7569/ADE7166/ADE7169 are placed in

watt positive-only accumulation mode by setting the POAM bit

in the ACCMODE register (0x0F). In this mode, the energy

accumulation is only done for positive power, ignoring any

occurrence of negative power above or below the no-load

threshold (see Figure 67). 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 66. 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 66). Conversely, if

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

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

By using the interrupt enable register, the ADE7566/ADE7569/

ADE7166/ADE7169can 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/CLKIN). With full-scale sinusoidal signals on the

analog inputs and the WGAIN register set to 0x000, the average

word value from each LPF2 is 0xCCCCD (see

Figure 67. Energy Accumulation in Positive-Only Accumulation Mode

Watt Absolute Accumulation Mode

The ADE7566/ADE7569/ADE7166/ADE7169 are placed in

watt-absolute accumulation mode by setting the ABSAM bit in

the ACCMODE register (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 63). 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:

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.

Time

min

sec

409

xCCCCD

FFFF

FFFF,

xFFFF,

(16)

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