71M6541D Datasheet, PDF (133/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
CE
Address
0x21
0x22
0x23
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4C
Name
WRATE
KVAR
SUM_SAMPS
APULSEW
WPULSE_CTR
WPULSE_FRAC
WSUM_ACCUM
APULSER
VPULSE_CTR
VPULSE_FRAC
VSUM_ACCUM
Table 90: CE Pulse Generation Parameters
Default Description
547
6444
2520
0
0
0
0
0
0
0
0
VMAX ⋅ IMAX ⋅ K
Kh =
⋅Wh / pulse
WRATE ⋅ N _ACC ⋅ X
where:
K = 66.1782 (Local Sensors)
K = 109.1587 (Remote Sensor)
N_ACC = SUM_SAMPS[12:0] (CE RAM 0x23)
See Table 83 for the definition of X.
The default value yields 1.0 Wh/pulse for VMAX = 600 V and
IMAX = 208 A. The maximum value for WRATE is 32,768 (2¹⁵).
Scale factor for VAR measurement.
SUM_SAMPS (N_ACC).
Wh pulse (WPULSE) generator input to be updated by the MPU
when using external pulse generation. The output pulse rate is:
APULSEW * F_S * 2^-32 * WRATE * X * 2^-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.
WPULSE counter.
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.
VPULSE counter.
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.