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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 45/91页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD 71M6543F-DB-CT |
| 标准包装： | 1 |
| 系列： | * |
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71M6543 Demo Board User’s Manual
means that the output of the gain adjust function is the same as the input. A value of 99% of 16385, or 16222,
means that the signal is attenuated by 1%.
The Demo Code bases its adjustment on the deviation from calibration (room) temperature DELTA_T and the
coefficients PPMC and PPMC2 to implement the equation below:
GAIN _ ADJ = 16385 +
DELTA _ T ? PPMC
2 14
+
DELTA _ T 2 ? PPMC 2
2 23
It can be seen easily that the gain will remain at 16385 (0x4001), or unity gain, when DELTA_T is zero. In the
Demo Code, DELTA_T is scaled so 0.1°C corresponds to 1 LSB of DELTA_T .
For complete compensation, the error sources for each channel have to be combined and curve-fit to generate
the PPMC and PPMC2 coefficients, as will be shown in the following section.
For Demo Codes revision 5.3a and later, the PPMC and PPMC2 coefficients are in the MPU RAM locations
Table 2-2: MPU Registers for Temperature-Compensation
CE Lo-
cation
0x20
0x21
0x22
0x23
0x24
PPMC Register for
GAIN_ADJ0
GAIN_ADJ1
GAIN_ADJ2
GAIN_ADJ3
GAIN_ADJ0
CE Lo-
cation
0x25
0x26
0x27
0x28
0x29
PPMC2 Register for
GAIN_ADJ0
GAIN_ADJ1
GAIN_ADJ2
GAIN_ADJ3
GAIN_ADJ0
When the Demo Code starts up (after reset or power-up), it determines whether the meter has been calibrated.
If this is not the case, the coefficients PPMC and PPMC2 are automatically determined based on information
found in the 71M6543 and in the 71M6x0x Remote Sensor Interface ICs. These coefficients are calculated to
compensate for the reference voltage deviation in these devices, but can be enhanced to also compensate for
the shunt resistors connected to each device.
2.3.3 CALCULATING PARAMETERS FOR COMPENSATION
2.3.3.1 Shunt Resistors
The TC of the shunt resistors can be characterized using a temperature chamber, a calibrated current, and a
voltmeter with filtering capabilities. A few shunt resistors should be measured and their TC should be compared.
This type of information can also be obtained from the manufacturer. For sufficient compensation, the TC of the
shunt resistors must be repeatable. If the shunts are the only temperature-dependent components in a meter,
and the accuracy is required to be within 0.5% over the industrial temperature range, the repeatability must be
better than:
R = (5000 PPM) / (60°C) = 83.3 PPM/°C
This means that for a shunt resistor with +200 PPM/°C, the individual samples must be within +116.7 PPM/°C
and 283.3 PPM/°C.
Let us assume a shunt resistor of 55 μ Ω in phase A. This resistor is 10% above the nominal value of 50 μ Ω, but
this is of minor importance, since this deviation will be compensated by calibration. In a temperature chamber,
this resistor generates a voltage drop of 5.4559 mV at -40°C and 5.541 mV at +85°C with a current of 100 A
applied. This is equivalent to a resistance deviation of 0.851 μΩ, or 15,473 PPM. With a temperature difference
between hottest and coldest measurement of 125°C, this results in +124 PPM/°C. At high temperatures, this re-
sistor will read the current 60°C * 124 PPM/°C, or 0.744% too high. This means that the GAIN_ADJ1 register
has to be adjusted by -0.744% at the same temperature to compensate for the TC of the shunt resistor.
Page: 45 of 91
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相关代理商/技术参数 |
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| 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 |
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