參數(shù)資料
型號： 71M6533-IGT/F
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP100
封裝： LEAD FREE, LQFP-100
文件頁數(shù)： 121/124頁
文件大小： 2008K
代理商： 71M6533-IGT/F
71M6533/71M6534 Data Sheet
FDS_6533_6534_004
96
2007-2009 TERIDIAN Semiconductor Corporation
v1.1
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.
Table 56: CE Energy Measurement Variables
CE Ad-
dress
Name
Description
0x8F
I0SQSUM_X
The sum of squared current samples from each element.
LSBI = 9.4045*10
-13 IMAX2 / In_82 A2h
0x90
I1SQSUM_X
0x91
I2SQSUM_X
0x92
INSQSUM_X
The sum of squared current samples from the calculated neutral:
∑
+
2
1
0
)
(
I
LSB=9.4045*10
-13 IMAX2 / In_82 A2h
0x99
I0SQRES_X
Residual current measurements with double-precision accuracy. The
exact current is:
ISQn = InSQSUM_X + InSQRES_X
0x9A
I1SQRES_X
0x9B
I2SQRES_X
0x9C
INSQRES_X
0x93
V0SQSUM_X
The sum of squared voltage samples from each element.
LSBV= 9.4045*10
-13 VMAX2 V2h
0x94
V1SQSUM_X
0x95
V2SQSUM_X
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.
Table 57: Other Transfer Variables
CE Ad-
dress
Name
Description
0x82
FREQ_X
Fundamental frequency: LSB
6
32
10
587
.
0
2
≈
≡ S
F
Hz
0x97
PH_AtoB_X
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/NACC + 2.4
ACC
S
I
RMS
N
F
LSB
IxSQSUM
Ix
=
3600
ACC
S
V
RMS
N
F
LSB
VxSQSUM
Vx
=
3600
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