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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 62 of 156

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 ADE5166/ADE5169/ADE5566/

ADE5569. 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 2 SFR (MIRQENM, Address 0xDA),

the ADE5166/ADE5169/ADE5566/ADE5569 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

μs

xCCCCD

FFFF

xFFFF

(14)

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

varies, as shown in Equation 15.

Time = TimeWDIV = 0 × WDIV

(15)

Active Energy Accumulation Modes

Watt Signed Accumulation Mode

The ADE5166/ADE5169/ADE5566/ADE5569 active energy

default accumulation mode is a watt-signed accumulation that

is based on the active power information.

Watt Positive-Only Accumulation Mode

The ADE5166/ADE5169/ADE5566/ADE5569 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 accumu-

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

mode is off. Detection of 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 ADE5166/ADE5169/ADE5566/ADE5569 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 transitions in the direction of power flow and

detection of no load threshold are active in this mode.

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