71M6542F MAXIM [Maxim Integrated Products], 71M6542F Datasheet - Page 131

• Manufacturer Part Number: 71M6542F
• Description: 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs
• Manufacturer: MAXIM [Maxim Integrated Products]

5.3.8.2 Instantaneous Energy Measurement Variables
IxSQSUM_X and VxSQSUM (see
acquired during the last accumulation interval.
Address
†
Address
†
The RMS values can be computed by the MPU from the squared current and voltage samples as follows:
Note: N
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
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.
71M6542 only.
71M6542 only.
0x91
0x91
0x8C
0x8D
0x8C
0x8D
0x90
0x90
CE
CE
Ix
RMS
†
†
ACC
=
= SUM_SAMPS[12:0] (CE RAM 0x23).
V0SQSUM_X
V1SQSUM_X
V0SQSUM_X
V1SQSUM_X
I0SQSUM_X
I1SQSUM_X
I0SQSUM_X
I1SQSUM_X
IxSQSUM
Name
Name
Table 88: CE Energy Measurement Variables (with Remote Sensor)
Table 87: CE Energy Measurement Variables (with Local Sensors)
Table 89.
⋅
N
LSB
ACC
The sum of squared current samples from each
element.
When EQU = 1, I0SQSUM_X is based on IA and
IB.
The sum of squared voltage samples from each
element.
The sum of squared current samples from each
element.
When EQU = 1, I0SQSUM_X is based on IA and
IB.
The sum of squared voltage samples from each
element.
I
Table
⋅
LSB
LSB
LSB
LSB
3600
I
V
I
V
= 9.4045*10
= 9.40448*10
87) are the sum of the squared current and voltage samples
= 9.4045*10
= 2.55872*10
⋅
F
S
Description
Description
-13
-13
-13
-12
VMAX
IMAX
* IMAX
* VMAX
Vx
2
RMS
2
71M6541D/F/G and 71M6542F/G Data Sheet
A
V
2
2
2
2
h
=
A
h
V
2
2
h
h
VxSQSUM
⋅
N
LSB
ACC
Figure 35
Figure 37
Figure 36
Figure 38
V
Configuration
Configuration
⋅
3600
⋅
(page 93)
(page 95)
(page 94)
(page 96)
F
S