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Preliminary Technical Data
Current Channel RMS Calculation
Each ADE7566/ADE7569 simultaneously calculates the rms values
for the current and voltage channels in different registers. Figure 48
shows the detail of the signal processing chain for the rms
calculation on the current channel. The current channel rms
value is processed from the samples used in the current channel
waveform sampling mode and is stored in an unsigned 24-bit
register (I rms ) . One LSB of the current channel rms register is
equivalent to one LSB of a current channel waveform sample.
The update rate of the current channel rms measurement is
MCLK/5. To minimize noise in the reading of the register, the
I rms register can also be configured to update only with the zero
crossing of the voltage input. This configuration is done by
setting the ZXRMS bit in the MODE2 Register (0x0C).
With the specified full-scale analog input signal of 0.5 V, the
ADC produces an output code that is approximately
±0d2,684,354 (see the Current Channel ADC section). The
ADE7566/ADE7569
between full scale and full scale/1000. The conversion from the
register value to amps must be done externally in the
microprocessor using an amps/LSB constant.
Current Channel RMS Offset Compensation
The ADE7566/ADE7569 incorporate a current channel rms
offset compensation register (IRMSOS). This is a 12-bit signed
register that can be used to remove offset in the current channel
rms calculation. An offset can exist in the rms calculation due
to input noises that are integrated in the dc component of V 2 (t).
The offset calibration allows the content of the I rms register to be
maintained at 0 when no input is present on current channel.
One LSB of the current channel rms offset is equivalent to
16,384 LSBs of the square of the current channel rms register.
Assuming that the maximum value from the current channel
rms calculation is 0d1,898,124 with full-scale ac inputs, then
1 LSB of the current channel rms offset represents 0.23% of
measurement error at ?60 dB down of full scale.
equivalent rms value of a full-scale ac signal is 0d1,898,124
(0x1CF68C). The current rms measurement provided in the
ADE7566/ADE7569 is accurate to within 0.5% for signal inputs
60Hz
0x2B7850
0x000000
0xD487B0
I rms = I rms 0 2 + IRMSOS × 32768
where I rms 0 is the rms measurement without offset correction.
CURRENT CHANNEL
WAVEFORM
DATA RANGE WITH
INTEGRATOR ON (60Hz)
(6)
MODE1[5]
IRMSOS[11:0]
I rms (t)
IA
IB
HPF
HPF
DIGITAL
INTEGRATOR*
dt
HPF1
24
sgn 2 25
LPF3
2 26
2 27
+
2 18
2 17 2 16
24
0x00
I rms [23:0]
CURRENT CHANNEL
WAVEFORM
DATA RANGE WITH
INTEGRATOR OFF
0x28F5C2
0x000000
0xD70A3E
Figure 48. Current Channel RMS Signal Processing
Rev. PrA | Page 49 of 136
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