參數(shù)資料
型號： 71M6541F-IGTR/F
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號調理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP64
封裝： LEAD FREE, LQFP-64
文件頁數(shù)： 37/165頁
文件大小： 2208K
代理商： 71M6541F-IGTR/F
v1.1
2008–2011 Teridian Semiconductor Corporation
131
5.3.8.2 Instantaneous Energy Measurement Variables
IxSQSUM_X and VxSQSUM (see Table 87) are the sum of the squared current and voltage samples
acquired during the last accumulation interval.
Table 87: CE Energy Measurement Variables (with Local Sensors)
CE
Address
Name
Description
Configuration
0x8C
I0SQSUM_X
The sum of squared current samples from each
element.
LSBI = 9.4045*10
-13 IMAX2 A2h
When EQU = 1, I0SQSUM_X is based on IA and
IB.
0x8D
I1SQSUM_X
0x90
V0SQSUM_X
The sum of squared voltage samples from each
element.
LSBV= 9.4045*10
-13 VMAX2 V2h
0x91
V1SQSUM_X
71M6542 only.
Table 88: CE Energy Measurement Variables (with Remote Sensor)
CE
Address
Name
Description
Configuration
0x8C
I0SQSUM_X
The sum of squared current samples from each
element.
LSBI = 2.55872*10
-12 * IMAX2 A2h
When EQU = 1, I0SQSUM_X is based on IA and
IB.
0x8D
I1SQSUM_X
0x90
V0SQSUM_X
The sum of squared voltage samples from each
element.
LSBV= 9.40448*10
-13 * VMAX2 V2h
0x91
V1SQSUM_X
71M6542 only.
The RMS values can be computed by the MPU from the squared current and voltage samples as follows:
Note: NACC = SUM_SAMPS[12:0] (CE RAM 0x23).
Other Transfer variables include those available for frequency and phase measurement, and those
reflecting the count of the zero-crossings of the mains voltage and the battery voltage. These transfer
variables are listed in Table 89.
MAINEDGE_X (CE RAM 0x83) reflects the number of half-cycles accounted for in the last accumulated
interval for the AC signal of the phase specified in the FREQSEL[1:0] field in CECONFIG (CE RAM 0x20[7:6]).
MAINEDGE_X is useful for implementing a real-time clock based on the input AC signal.
ACC
S
I
RMS
N
F
LSB
IxSQSUM
Ix
=
3600
ACC
S
V
RMS
N
F
LSB
VxSQSUM
Vx
=
3600
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