參數(shù)資料
型號： 71M6515H-IGTW/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, PQFP64
封裝： LEAD FREE, LQFP-64
文件頁數(shù)： 31/60頁
文件大?。?/td> 826K
代理商： 71M6515H-IGTW/F
71M6515H
Energy Meter IC
DATA SHEET
JULY 2011
Page: 37 of 60
2005
2011 Teridian Semiconductor Corporation
1.6
A Maxim Integrated Products Brand
Example: For a Wh measurement, an error of +1% was observed at 1A. If VMAX is 600V and IMAX = 208A,
and if the measurement was taken at 240V, we determine QUANT_W as follows:
18460
10
04173
.
1
208
600
1
240
100
1
_
9
=
=
W
QUANT
The negative value obtained by the calculation will compensate for the positive error. It does not matter which current value
is chosen as long as the corresponding error value is significant (5% error at 0.2A used in the above equation will produce
the same result for QUANT_W).
Input noise and truncation can cause similar errors in the VAR calculation that can be eliminated using the QUANT_VAR
register.
VFEED_A (0x44), VFEED_B (0x45), VFEED_C (0x46)
These registers hold the compensation factors for feedthrough used for calibrating Rogowski coils. The allowed range is
(2
15-1) to -(215-1). See the section on Rogowski Coil Calibration for details.
Registers Controlling Basic Function and Settings of the 71M6515H
CONFIG (0x16)
The four bytes written to this register determine the basic operation of the 71M6515H. The function of the 28 bits used for
this register are explained below:
Bit 0: This bit (VAH_SELECT) determines the method used by the post-processor for determining the apparent energy
measured in VAh. If the bit is 0 (default), the calculation is based on VRMS, IRMS and the time (t) per the formula:
VAh = VRMS * IRMS * t
The accuracy of the result can be improved for low currents by setting Bit 0 to 1. The calculation is then based on the Wh
and VARh values per the formula:
2
VARh
Wh
VAh
+
=
Using the calculation method above, high accuracy can be achieved for low currents.
Bit 3: This bit (RTM_EN) enables the Real-Time Monitor function when set to 1.When used, the RTM signal is available at
the TMUX pin.
Bit 4: This bit (CE_EN) enables the CE when set to 1. The CE has to be enabled for most metering functions.
Bits 7-5: These three bits (EQU) define the equation (see table below) to be implemented by the CE.
EQU
Watt & VAR Formula
Application
0
VA IA
1 element, 2W 1
1*
VA(IA-IB)/2
1 element, 3W 1
2
VA IA + VB IB
2 element, 3W 3 Delta
3*
VA (IA - IB)/2 + VC IC
2 element, 4W 3 Delta
4*
VA(IA-IB)/2 + VB(IC-IB)/2)
2 element, 4W 3 Wye
5
VA IA + VB IB + VC IC
3 element, 4W 3 Wye
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71M6521BE-IGT/F 功能描述:計(jì)量片上系統(tǒng) - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 處理器系列:71M6511 類型:Metering SoC 最大時(shí)鐘頻率:70 Hz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:7 KB 接口類型:UART 可編程輸入/輸出端數(shù)量:12 片上 ADC: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-64 封裝:Reel
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