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ADE7759
15
APOS [15:0]
0
CURRENT CHANNEL
SIGN 2 6
2 5
2 4
2 3
2 2
2 1
2 0
2 –1 2 –2 2 –3 2 –4 2 –5 2 –6 2 –7 2 –8
20
LPF2
+
+
23
WAVEFORM [24:0]
0
VOLTAGE CHANNEL
T
4
CLKIN
ACTIVE POWER
SIGNAL = P
WAVEFORM
39
AENERGY [39:0]
0
+
+
REGISTER
VALUES
WAVEFORM REGISTER VALUES ARE
ACCUMULATED (INTEGRATED) IN
THE ACTIVE ENERGY REGISTER
TIME – nT
Figure 36. Energy Calculation
AENERGY [39:0]
7F,FFFF,FFFFh. Therefore, the integration time under these
7F,FFFF,FFFFh
APGAIN = 7FFh
conditions is calculated as follows:
3F,FFFF,FFFFh
APGAIN = 000h
APGAIN = 800h
Time =
7 F , FFFF , FFFFh
CCCDh
× 1 . 1 μ s = 11 . 53 sec onds
POWER OFFSET CALIBRATION
00,0000,0000h
5.8s
11.5s
23s
TIME – sec
The ADE7759 also incorporates an active power offset regis-
ter (APOS[15:0]). This is a signed twos complement 16-bit
register that can be used to remove offsets in the active power
40,0000,0000
80,0000,0000h
Figure 37. Energy Register Rollover Time for Full-Scale
Power (Minimum and Maximum Power Gain)
Note that the energy register contents will roll over to full-scale
negative (80,0000,0000h) and continue increasing in value when
the power or energy flow is positive—see Figure 37. Conversely, if
the power is negative, the energy register would underflow to full-
scale positive (7F, FFFF, FFFFh) and continue decreasing in
value. By using the interrupt enable register, the ADE7759
can be configured to issue an interrupt ( IRQ ) when the active
energy register is half-full (positive or negative) or when an
over/underflow occurs.
Integration Time under Steady Load
As mentioned in the last section, the discrete time sample
period (T) for the accumulation register is 1.1 μ s (4/CLKIN).
With full-scale sinusoidal signals on the analog inputs, digital
integrator turned off, and the active power gain register set to
000h, the average word value from LPF2 is CCCD—see
Figures 34 and 35. The maximum value that can be stored in
the active energy register before it overflows is 2 39 or
calculation—see Figure 36. An offset may exist in the power
calculation due to crosstalk between channels on the PCB or in
the IC itself. The offset calibration will allow the contents of the
active power register to be maintained at zero when no power is
being consumed.
The 256 LSBs (APOS = 0100h) written to the active power
offset register are equivalent to 1 LSB in the waveform sample
register, assuming the average value output from LPF2 to
store in the waveform register is CCCDh (52,429 in decimal)
when inputs on Channels 1 and 2 are both at full scale and
the digital integrator is turned off. At –60 dB down on Chan-
nel 1 (1/1000 of the Channel 1 full-scale input), the average
word value output from LPF2 is 52.429 (52,429/1,000). One
LSB in the waveform register has a measurement error of
1/52.429 × 100% = 1.9% of the average value. The active
power offset register has a resolution equal to 1/256 LSB of
the waveform register, thus the power offset correction reso-
lution is 0.007%/LSB (1.9%/256) at –60 dB. When the digital
integrator is turned on, the resolution of the LSB varies slightly
with the line frequency.
ENERGY-TO-FREQUENCY CONVERSION
ADE7759 also provides energy-to-frequency conversion for
calibration purposes. After initial calibration at manufacturing,
the manufacturer or end customer will often verify the energy
meter calibration. One convenient way to verify the meter cali-
bration is for the manufacturer to provide an output frequency
that is proportional to the energy or active power under steady
–22 –
REV. A
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