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71M6543F/71M6543G Data Sheet
Table 83: CE Pulse Generation Parameters
APULSEW * F S * 2
* WRATE * X * 2 .
CE
Address
0x21
0x22
0x23
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4C
Name
WRATE
KVAR
SUM_PRE
APULSEW
WPULSE_CTR
WPULSE_ FRAC
WSUM_ ACCUM
APULSER
VPULSE_CTR
VPULSE_ FRAC
VSUM_ACCUM
Default
227
6444
2184
0
0
0
0
0
0
0
0
Description
Kh = VMAX*IMAX*K / ( WRATE *N ACC *X) Wh/pulse
where:
K = 76.3594 when used with local sensors (CT or shunt)
K = 54.5793 when used with 71M6xx3 remote sensors
Scale factor for VAR measurement.
Number of samples per accumulation interval, as specified in
SUM_SAMPS[12:0], I/O RAM 0x2107[4:0], 0x2108[7:0] (N ACC ).
Wh pulse (WPULSE) generator input to be updated by the MPU
when using external pulse generation. The output pulse rate is:
-32 -14
This input is buffered and can be updated by the MPU during a
conversion interval. The change takes effect at the beginning of
the next interval.
Counter for WPULSE output.
Unsigned numerator, containing a fraction of a pulse. The value
in this register always counts up towards the next pulse.
Roll-over accumulator for WPULSE.
VARh (VPULSE) pulse generator input.
Counter for VPULSE output.
Unsigned numerator, containing a fraction of a pulse. The value
in this register always counts up towards the next pulse.
Roll-over accumulator for VPULSE.
Other CE Parameters
Table 84 shows the QUANT CE parameters used for suppression of noise due to scaling and truncation
effects. The equations for calculating the LSB weight of each QUANT parameter are provided at the
bottom of Table 84 .
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