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ADE5166/ADE5169

Rev. 0 | Page 56 of 148

Figure 62 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. 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

WATTHR[23:0]

6.82

3.41

10.2

13.7

TIME (Minutes)

WGAIN = 0x7FF

WGAIN = 0x000

WGAIN = 0x800

0x80,0000

Figure 62. 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 62). 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 ADE5166/ADE5169 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 59). 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

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 active energy default accumulation

mode is a watt-signed accumulation based on the active power

information.

Watt Positive-Only Accumulation Mode

The ADE5166/ADE5169 are placed in watt positive-only accumu-

lation mode by setting the POAM bit (Bit 1) in the ACCMODE

is done only for positive power, ignoring any occurrence of

negative power above or below the no load threshold (see

Figure 63). 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 63. Energy Accumulation in Positive-Only Accumulation Mode

Watt-Absolute Accumulation Mode

The ADE5166/ADE5169 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 64). 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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