71m6534h-igt Maxim Integrated Products, Inc., 71m6534h-igt Datasheet - Page 96

• Manufacturer Part Number: 71m6534h-igt
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

71M6533/71M6534 Data Sheet
Instantaneous Energy Measurement Variables
IxSQSUM_X and VxSQSUM are the squared current and voltage samples acquired during the last accumu-
lation interval. INSQSUM_X can be used for computing the neutral current.
The RMS values can be computed by the MPU from the squared current and voltage samples as follows:
Other Transfer variables include those available for frequency and phase measurement, and those re-
flecting the count of the zero-crossings of the mains voltage and the battery voltage. These transfer va-
riables are listed in Table 57.
MAINEDGE_X reflects the number of half-cycles accounted for in the last accumulated interval for the AC
signal of the phase specified in the FREQSEL1 and FREQSEL0 registers. MAINEDGE_X is useful for im-
plementing a real-time clock based on the input AC signal.
96
CE Ad-
CE Ad-
dress
0x9C
Ix
0x8F
0x90
0x91
0x92
0x99
0x9A
0x9B
0x93
0x94
0x95
dress
0x82
0x97
RMS
IxSQSUM
V0SQSUM_X
V1SQSUM_X
V2SQSUM_X
INSQSUM_X
I0SQSUM_X
I1SQSUM_X
I2SQSUM_X
INSQRES_X
PH_AtoB_X
I0SQRES_X
I1SQRES_X
I2SQRES_X
FREQ_X
Name
Name
N
© 2007-2009 TERIDIAN Semiconductor Corporation
LSB
ACC
Table 56: CE Energy Measurement Variables
I
Description
Fundamental frequency: LSB
Voltage phase lag. The selection of the reference phase is based on
FREQSEL1 and FREQSEL0 in the CECONFIG register:
If FREQSEL1/FREQSEL0 select phase A: Phase lag from A to B.
If FREQSEL1/FREQSEL0 select phase B: Phase lag from B to C.
If FREQSEL1/FREQSEL0 select phase C: Phase lag from C to A.
The angle in degrees is (0 to 360): PH_AtoB_X * 360/N
3600
Description
The sum of squared current samples from each element.
The sum of squared current samples from the calculated neutral:
LSB=9.4045*10
Residual current measurements with double-precision accuracy. The
exact current is:
The sum of squared voltage samples from each element.
Table 57: Other Transfer Variables
LSB
ISQn = InSQSUM_X + InSQRES_X
LSB
F
(
I
V
S
I
= 9.4045*10
= 9.4045*10
0
I
1
-13
I
IMAX
2
)
-13
-13
2
Vx
IMAX
2
VMAX
RMS
/ In_8
2
2
/ In_8
2
V
A
2
2
F
VxSQSUM
h
2
32
S
h
2
A
. 0
2
h
587
10
N
LSB
ACC
FDS_6533_6534_004
6
Hz
V
ACC
3600
+ 2.4
F
S
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