71M6534-IGT/F Maxim Integrated Products, 71M6534-IGT/F Datasheet - Page 101

• Manufacturer Part Number: 71M6534-IGT/F
• Description: IC ENERY METER 3PH 128K 120-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6534-IGT/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-120
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

signal of the phase specified in the FREQSEL1 and FREQSEL0 registers. MAINEDGE_X is useful for
WSUM_X and VARSUM_X are the signed sum of Phase-A, Phase-B and Phase-C Wh or VARh values
according to the metering equation specified in the I/O RAM register EQU[2:0]. WxSUM_X is the Wh value
accumulated for phase x in the last accumulation interval and can be computed based on the specified
LSB value.
For example, with VMAX = 600 V and IMAX = 208 A, the LSB for WxSUM_X is 0.1173 µWh.
Instantaneous Energy Measurement Variables
Table 61
voltage samples acquired during the last accumulation interval. They can be used to calculate RMS voltages
and currents. 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 reflecting
the count of the zero-crossings of the mains voltage and the battery voltage. These transfer variables are
listed in
MAINEDGE_X reflects the number of half-cycles accounted for in the last accumulated interval for the AC
implementing a real-time clock based on the input AC signal.
Rev 2
Address
0x8F
0x9A
0x9B
0x9C
Ix
0x90
0x91
0x92
0x99
0x93
0x94
0x95
CE
RMS
Table
contains various measurement variables. IxSQSUM_X and VxSQSUM are the squared current and
=
IxSQSUM
62.
V0SQSUM_X
V1SQSUM_X
V2SQSUM_X
INSQSUM_X
I0SQSUM_X
I1SQSUM_X
I2SQSUM_X
INSQRES_X
I0SQRES_X
I1SQRES_X
I2SQRES_X
Name
⋅
N
LSB
ACC
Table 61: CE Energy Measurement Variables
I
⋅
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.
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
VMAX
2
RMS
/ In_8
=
2
2
/ In_8
2
V
A
2
VxSQSUM
h
2
h
2
A
2
h
⋅
N
LSB
ACC
V
⋅
3600
⋅
F
S
101