参数资料
型号: 71M6542F-IGT/F
厂商: Maxim Integrated
文件页数: 132/166页
文件大小: 0K
描述: IC ENERGY METERING
标准包装: 90
系列: *
71M6541D/F/G and 71M6542F/G Data Sheet
WSUM_X ( CE RAM 0x84 ) and VARSUM_X (CE RAM 0x88) are the signed sum of Phase-A and Phase-B Wh
or VARh values according to the metering equation specified in the I/O RAM control field EQU[2:0] (I/O
RAM 0x2106[7:5]) . WxSUM_X (x = 0 or 1, CE RAM 0x85 and 0x86 ) is the Wh value accumulated for phase x
in the last accumulation interval and can be computed based on the specified LSB value.
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
0x8C
Name
I0SQSUM_X
Description
The sum of squared current samples from each
element.
Configuration
LSB = 9.4045*10 -13 IMAX 2 A 2 h
0x8D
0x90
0x91 ?
I1SQSUM_X
V0SQSUM_X
V1SQSUM_X
For ce41a04, LSB = 6.6952*10 -13 IMAX 2 A 2 h.
When EQU = 1, I0SQSUM_X is based on IA and
IB.
The sum of squared voltage samples from each
element.
LSB = 9.4045*10 -13 VMAX 2 V 2 h
For ce41a04, LSB = 6.6952*10^ -13 VMAX 2 V 2 h.
Figure 35 (page 93 )
Figure 37 (page 95 )
?
71M6542 only.
Table 88: CE Energy Measurement Variables (with Remote Sensor)
CE
Address
0x8C
0x8D
0x90
0x91 ?
Name
I0SQSUM_X
I1SQSUM_X
V0SQSUM_X
V1SQSUM_X
Description
The sum of squared current samples from each
element.
LSB I = 2.55872*10 -12 * IMAX 2 A 2 h
When EQU = 1, I0SQSUM_X is based on IA and
IB.
The sum of squared voltage samples from each
element.
LSB V = 9.40448*10 -13 * VMAX 2 V 2 h
Configuration
Figure 36 (page 94 )
Figure 38 (page 96 )
?
71M6542 only.
The RMS values can be computed by the MPU from the squared current and voltage samples as follows:
Ix RMS =
IxSQSUM ? LSB I ? 3600 ? F S
N ACC
Vx RMS =
VxSQSUM ? LSB V ? 3600 ? F S
N ACC
Note: N ACC = 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.
132
Rev 4
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