參數(shù)資料
型號: 71M6521DE-IM/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, QCC68
封裝: LEAD FREE, LQFN-68
文件頁數(shù): 87/103頁
文件大?。?/td> 1691K
代理商: 71M6521DE-IM/F
71M6521DE/71M6521FE
Energy Meter IC
DATA SHEET
OCTOBER 2010
Page: 84 of 103
2005-2010 Teridian Semiconductor Corporation
v1.1
A Maxim Integrated Products Brand
19-5370; 10/10
CE
Address
Name
Description
0x76
W0SUM_X
The sum of Watt samples from each wattmeter element (In_8 is the gain
configured by IA_SHUNT or IB_SHUNT).
LSB = 6.6952*10
-13 VMAX IMAX / In_8 Wh.
0x72
W1SUM_X
0x75
VAR0SUM_X
The sum of VAR samples from each wattmeter element (In_8 is the gain
configured by IA_SHUNT or IB_SHUNT).
LSB = 6.6952*10
-13 VMAX IMAX / In_8 Wh.
0x71
VAR1SUM_X
WxSUM_X is the Wh value accumulated for element ‘X’ in the last accumulation interval and can be computed based on the
specified LSB value.
For example with VMAX = 600V and IMAX = 208A, LSB (for WxSUM_X ) is 0.08356 Wh.
Instantaneous Energy Measurement Variables
The Frequency measurement is computed using the Frequency locked loop for the selected phase.
IxSQSUM_X and VxSQSUM are the squared current and voltage samples acquired during the last accumulation interval.
INSQSUM_X can be used for computing the neutral current.
CE
Address
Name
Description
0x79
FREQ_X
Fundamental frequency. LSB
6
32
10
587
.
0
2
S
F
Hz
0x77
I0SQSUM_X
The sum of squared current samples from each element.
LSB = 6.6952*10
-13 IMAX2 / In_82 A2h
0x73
I1SQSUM_X
0x78
V0SQSUM_X
The sum of squared voltage samples from each element.
LSB= 6.6952*10
-13 VMAX2 V2h
0x74
V1SQSUM_X
0x7D
WSUM_ACCUM
These are roll-over accumulators for WPULSE and VPULSE
respectively.
0x7E
VSUM_ACCUM
The RMS values can be computed by the MPU from the squared current and voltage samples as follows:
ACC
S
RMS
N
F
LSB
IxSQSUM
Ix
=
3600
Other Measurement Parameters
MAINEDGE_X is useful for implementing a real-time clock based on the input AC signal. MAINEDGE_X is the number of half-
cycles accounted for in the last accumulated interval for the AC signal.
TEMP_RAW may be used by the MPU to monitor chip temperature or to implement temperature compensation.
ACC
S
RMS
N
F
LSB
VxSQSUM
Vx
=
3600
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