Datasheet

ADE5166/ADE5169/ADE5566/ADE5569 Data Sheet
Rev. D | Page 58 of 156
One LSB of the current channel rms offset is equivalent to
32,768 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 from full scale.
768,32
2
×+= IRMSOSII
0
rmsrms
(4)
where I
rms0
is the rms measurement without offset correction.
I
rms
(t)
0x00
+
IRMSOS[11:0]
I
rms
[23:0]
2
26
2
25
sgn 2
27
2
17
2
16
2
18
24 24
dt
HPF
MODE1[5]
HPF
CURRENT CHANNEL
WAVEFORM
DATA RANGE WITH
INTEGRATOR OFF
0xD70A3E
0x000000
0x28F5C2
60Hz
0xD487B0
I
PA
I
PB
0x2B7850
0x000000
CURRENT CHANNEL
WAVEFORM
DATA RANGE WITH
INTEGRATOR ON (60Hz)
HPF1
DIGITAL
INTEGRATOR*
LPF3
07411-057
LPF2
IBGAIN
*NOTE THAT THE DIGITAL INTEGRATOR IS NOT AVAILABLE IN THE ADE5166.
Figure 61. ADE5166/ADE5169 Current Channel RMS Signal Processing with PGA1 = 2, 4, 8, or 16
I
rms
(t)
0x00
+
IRMSOS[11:0]
I
rms
[23:0]
2
26
2
25
sgn 2
27
2
17
2
16
2
18
24 24
dt
MODE1[5]
CURRENT CHANNEL
WAVEFORM
DATA RANGE WITH
INTEGRATOR OFF
0xD70A3E
0x000000
0x28F5C2
60Hz
0xD487B0
0x2B7850
0x000000
CURRENT CHANNEL
WAVEFORM
DATA RANGE WITH
INTEGRATOR ON (60Hz)
DIGITAL
INTEGRATOR*
LPF3
07411-059
HPF
I
PA
*NOTE THAT THE DIGITAL INTEGRATOR IS NOT AVAILABLE IN THE ADE5566.
HPF1
LPF2
Figure 62. ADE5566/ADE5569 Current Channel RMS Signal Processing with PGA1 = 2, 4, 8, or 16