71M6531D Datasheet, PDF (90/115 Pages) Teridian Semiconductor Corporation – Energy Meter IC

Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
CE Ad-
dress
0x85
0x86
0x87
0x8A
0x8B
0x8C
Name
WSUM_X
W0SUM_X
W1SUM_X
VARSUM_X
VAR0SUM_X
VAR1SUM_X
Table 55: CE Transfer Variables
Description
For EQU = 2, this register holds the calculated sum of Wh samples
from each wattmeter element (In_8 is the gain of 1 or 8 configured by
IA_SHUNT or IB_SHUNT).
LSB = 6.6952*10^-13 VMAX IMAX / In_8 Wh.
The sum of Wh samples from each wattmeter element (In_8 is the gain
of 1 or 8 configured by IA_SHUNT or IB_SHUNT).
LSB = 6.6952*10^-13 VMAX IMAX / In_8 Wh.
For EQU = 2, this register holds the calculated sum of VARh samples
from each element (In_8 is the gain of 1 or 8 configured by IA_SHUNT
or IB_SHUNT).
LSB = 6.6952*10^-13 VMAX IMAX / In_8 VARh.
The sum of VARh samples from each element (In_8 is the gain 1 or 8
configured by IA_SHUNT or IB_SHUNT).
LSB = 6.6952*10^-13 VMAX IMAX / In_8 VARh.
WxSUM_X is the Wh value accumulated for element X in the last accumulation interval and can be com-
puted based on the specified LSB value.
For example, with VMAX = 600 V and IMAX = 208 A, the LSB for WxSUM_X is 0.08356 µWh.
Instantaneous Measurement Variables
Table 56 contains various measurement results. The Frequency measurement is computed for the phase
selected with FREQSELn bits in the CECONFIG register.
IxSQSUM_X and VxSQSUM are the squared current and voltage samples acquired during the last accumu-
lation interval. They can be used to calculate RMS voltages and currents. INSQSUM_X can be used for
computing the neutral current.
Table 56: CE Energy Measurement Variables
CE Ad-
dress
0x82
0x8F
0x90
0x93
0x94
0x45
0x46
0x47
0x48
0x99
0x9A
Name
FREQ_X
I0SQSUM_X
I1SQSUM_X
V0SQSUM_X
V1SQSUM_X
WSUM_ACCUM
VSUM_ACCUM
SUM3_ACCUM
SUM4_ACCUM
I0SQRES_X
I1SQRES_X
Description
Fundamental frequency.
LSB ≡ ^FS ≈ 0.587 ⋅10^−6 Hz
2 ³²
The sum of squared current samples from each element.
LSB_I = 6.6952*10^-13 IMAX² / In_8² A²h
The sum of squared voltage samples from each element.
LSB_V= 6.6952*10^-13 VMAX² V²h
These registers contain roll-over accumulators for WPULSE and
VPULSE respectively.
These registers contain roll-over accumulators for pulse outputs
XPULSE and YPULSE respectively.
These registers hold residual current measurements with double-
precision accuracy. The exact current is:
ISQn = InSQSUM_X + InSQRES_X
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