- 您现在的位置：买卖IC网 > PDF目录1168 > 71M6543F-DB-CT (Maxim Integrated Products)DEMO BOARD 71M6543F-DB-CT PDF资料下载
参数资料
| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 43/91页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD 71M6543F-DB-CT |
| 标准包装： | 1 |
| 系列： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页当前第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页
71M6543 Demo Board User’s Manual
The value to be used for QUANT can be determined by the following formula:
V ? I
QUANT = ?
error
100
VMAX ? IMAX ? LSB
LSB = QUANT LSB value = 7.4162*10 W
Where error = observed error at a given voltage (V) and current (I),
VMAX = voltage scaling factor, as described in section 1.8.3,
IMAX = current scaling factor, as described in section 1.8.3,
-10
Example: Assuming an observed error as in Figure 2-5, we determine the error at 1A to be +1%. If VMAX is
600V and IMAX = 208A, and if the measurement was taken at 240V, we determine QUANTn as follows:
240 ? 1
QUANT = ?
1
100
600 ? 208 ? 7 . 4162 ? 10 ? 10
= ? 11339
There is a QUANTn register for each phase, and the values are to be written to the CE locations 0x28, 0x2C, or
0x30. 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 QUANTn ).
Input noise and truncation can cause similar errors in the VAR calculation that can be eliminated using the
QUANT_VARn variables. QUANT_VARn is determined using the same formula as QUANT .
2.3 TEMPERATURE COMPENSATION
2.3.1 ERROR SOURCES
This section discussed the temperature compensation for meters equipped with 71M6xxx Remote Sensor Inter-
faces. Compensation for CT-based systems is much simpler, since the error sources are only the reference
voltage, the burden resistor, and the voltage dividers.
For a meter to be accurate over temperature, the following major sources of error have to be addressed:
with ±80 PPM°C to within ±60°C *80*10 PPM/°C, or ±0.48%.
1)
2)
Page: 43 of 91
The resistance of the shunt sensor(s) over temperature. The temperature coefficient (TC) of a shunt
resistor is typically positive (PTC) and can be far higher than the TC of the pure Manganin material
used in the shunt. TCs of several hundred PPM/°C have been observed for certain shunt resistors. A
shunt resistor with +100 PPM/°C will increase its resistance by 60°C * 100*10 -6 PPM/°C, or +0.6%
when heated up from room temperature to +85°C, causing a relative error of +0.6% in the current
reading. This makes the shunt the most pronounced influence on the temperature characteristics of
the meter.
Typically, the TC of shunt resistors is mostly linear over the industrial temperature range and can be
compensated, granted the shunt resistor is at the same temperature as the on-chip temperature sen-
sors on the 71M6x0x Remote Sensor Interface IC or the 71M6543.
Generally, the lower the TC of a shunt resistor, the better it can be compensated. Shunts with high
TCs require more accurate temperature measurements than those with low TCs. For example, if a
shunt with 200 PPM/°C is used, and the temperature sensor available to the 71M6543 is only accurate
to ±3°C, the compensation can be inaccurate by as much as 3°C*200PPM/°C = 600 PPM, or 0.06%.
The reference voltage of the 71M6x03 Remote Sensor Interface IC. At the temperature extremes, this
voltage can deviate by a few mV from the room temperature voltage and can therefore contribute to
some temperature-related error. The TC of the reference voltage has both linear and quadratic com-
ponents (TC 1 and TC 2 ). Since the 71M6X03 Remote Interface IC has an on-chip temperature sensor,
and since the development of the reference voltage over temperature is predictable (to within ±10
PPM/°C for high-grade parts). For example, compensation of the current reading is possible for a part
-6
The reference voltage can be approached by the nominal reference voltage:
VNOM(T) = VNOM(22)+(T-22)*TC 1 +(T-22) 2 *TC 2
Actual values for TC 1 and TC 2 can be obtained using the formulae given in the data sheets for the
71M6543 and for the 71M6x03. Additionally, the Demo Code will automatically generate the compen-
sation coefficients based on TC 1 and TC 2 using the fuse values in each device.
v5
相关PDF资料 |
PDF描述 |
|---|---|
| 72-CNV-5 | CONVERTER RS-232 TO RS-422 5V |
| 72346-001 | 72346-1-SCA-II REC |
| 72347-001LF | CONN RECEPT SCA2 20POS VERT PCB |
| 72436-001LF | 80POS EXT HT. REC SCA-2 |
| 72442-201LF | CONN RECEPT SCA2 80POS VERT PCB |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6543F-IGT/F | 功能描述:计量片上系统 - SoC Precision Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6543F-IGTR/F | 功能描述:计量片上系统 - SoC Precision Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6543FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube |
| 71M6543FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
| 71M6543G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation |
发布紧急采购，3分钟左右您将得到回复。