Cirrus Logic AN365 - Manual (Page 13)

AN365
AN365REV1 13
4.3.3 I
RMS
Load Performance
Figure 12. I
RMS
Load Performance
5. Summary
The CS5480 energy measurement IC supports Rogowski coils using digital integrators. With the exception of two
single-pole RC filters, no other external components are required. With on-chip digital calibration and compensation
algorithms, the CS5480 can achieve 0.1% energy measurement accuracy over 4000:1 dynamic range.
Load Current (A)
Current Dynamic
Range (x:1)
I
RMS
Register Value
(10-Second Average) I
RMS
Error
120 1 0.599985965 0.00%
60 2 0.300011613 0.00%
12 10 0.06000053 0.00%
1.2 100 0.006000024 0.00%
0.24 500 0.001199722 -0.02%
0.12 1000 0.000600541 0.09%
Table 11. I
RMS
Load Performance
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.1 1 10 100
Pe
rc
e
n
ta
ge
Er
ror (
%
)
Load Current (A)