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Preliminary Technical Data

ADE5166/ADE5169/ADE5566/ADE5569

Rev. PrB | Page 57 of 148

Figure 45 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 45. 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 45). 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 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/MLCK). 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 42). The

maximum positive value that can be stored in the internal 49-bit

integration time under these conditions when WDIV = 0 is

calculated in the following equation:

Time =

min

sec

409

μs

xCCCCD

FFFF

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 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 in the

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

tion is only done for positive power, ignoring any occurrence

of negative power above or below the no load threshold (see

Figure 46). 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 46. 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

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 47). 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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