71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
AUGUST 2007
Figure 5 shows the accumulation interval resulting from MUX_DIV = 1, PRE_SAMPS = 42 and SUM_CYCLES = 50, consisting
of 2100 samples of 397µs each, followed by the XFER_BUSY interrupt. The sampling in this example is applied to a 50Hz
signal.
There is no correlation between the line signal frequency and the choice of PRE_SAMPS or SUM_CYCLES (even though
when SUM_CYCLES = 42 one set of SUM_CYCLES happens to sample a period of 16.6ms). Furthermore, sampling does not
have to start when the line voltage crosses the zero line.
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