參數(shù)資料
型號： 71M6542G-IGT/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, PQFP100
封裝： LEAD FREE, LQFP-100
文件頁數(shù)： 36/165頁
文件大?。?/td> 2208K
代理商： 71M6542G-IGT/F
130
2008–2011 Teridian Semiconductor Corporation
v1.1
When the MPU receives the XFER_BUSY interrupt, it knows that fresh data is available in the transfer
variables. CE transfer variables are modified during the CE code pass that ends with an XFER_BUSY
interrupt. They remain constant throughout each accumulation interval. In this data sheet, the names of
CE transfer variables always end with “_X”. The transfer variables can be categorized as:
Fundamental energy measurement variables
Instantaneous (RMS) values
Other measurement parameters
5.3.8.1 Fundamental Energy Measurement Variables
Table 85 and Table 86 describe each transfer variable for fundamental energy measurement. All
variables are signed 32-bit integers. Accumulated variables such as WSUM are internally scaled so they
have at least 2x margin before overflow when the integration time is one second. Additionally, the hardware
does not permit output values to fold back upon overflow.
Table 85: CE Transfer Variables (with Local Sensors)
CE
Address
Name
Description
Configuration
0x84
WSUM_X
The signed sum: W0SUM_X+W1SUM_X. Not used
for EQU[2:0] = 0 (I/O RAM 0x2106[7:5]) and
EQU[2:0] = 1.
0x85
W0SUM_X
The sum of Wh samples from each wattmeter
element.
LSBW = 9.4045*10
-13 * VMAX * IMAX Wh.
0x86
W1SUM_X
0x88
VARSUM_X
The signed sum: VAR0SUM_X+VAR1SUM_X. Not
used for EQU[2:0] = 0 and EQU[2:0] = 1.
0x89
VAR0SUM_X
The sum of VARh samples from each wattmeter
element.
LSBW = 9.4045*10
-13 * VMAX * IMAX VARh.
0x8A
VAR1SUM_X
Note:
71M6542 only.
Table 86: CE Transfer Variables (with Remote Sensor)
CE
Address
Name
Description
Configuration
0x84
WSUM_X
The signed sum: W0SUM_X+W1SUM_X. Not used
for EQU[2:0] = 0 (I/O RAM 0x2106[7:5]) and
EQU[2:0] = 1.
0x85
W0SUM_X
The sum of Wh samples from each wattmeter
element.
LSB = 1.55124*10
-12 * VMAX* IMAX Wh.
0x86
W1SUM_X
0x88
VARSUM_X
The signed sum: VAR0SUM_X+VAR1SUM_X. Not
used for EQU[2:0] = 0 and EQU[2:0] = 1.
0x89
VAR0SUM_X
The sum of VARh samples from each wattmeter
element.
LSB = 1.55124*10
-12 *VMAX* IMAX VARh.
0x8A
VAR1SUM_X
Note:
71M6542 only.
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.
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