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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/91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
1.8.2 USING THE DEMO BOARD FOR ENERGY MEASUREMENTS
The 71M6543 Demo Board was designed for use with shunt resistors connected via the Remote Sensor Inter-
faces and it is shipped in this configuration.
The Demo Board may immediately be used with 50 μ? shunt resistors (ANSI version) or 120 μ? shunt resistors
(IEC version). It is programmed for a kh factor of 3.2 (see Section 1.8.4 for adjusting the Demo Board for
shunts with different resistance).
Once, voltage is applied and load current is flowing, the red LED D5 will flash each time an energy sum of 3.2
Wh is collected. The LCD display will show the accumulated energy in Wh when set to display mode 3 (com-
mand >M3 via the serial interface).
Similarly, the red LED D6 will flash each time an energy sum of 3.2 VARh is collected. The LCD display will
show the accumulated energy in VARh when set to display mode 5 (command >M5 via the serial interface).
1.8.3 ADJUSTING THE KH FACTOR FOR THE DEMO BOARD
The 71M6543 Demo Board is shipped with a pre-programmed scaling factor Kh of 3.2, i.e. 3.2 Wh per pulse. In
order to be used with a calibrated load or a meter calibration system, the board should be connected to the AC
power source using the spade terminals on the bottom of the board. On the revision REV 4.0 of the Demo
Board, the shunt resistor wires are terminated directly to the dual-pin headers J22, J23, and J24 on the board.
The Kh value can be derived by reading the values for IMAX and VMAX (i.e. the RMS current and voltage val-
ues that correspond to the 250mV maximum input signal to the IC), and inserting them in the following equation
for Kh:
Kh = 54.5793* VMAX * IMAX / ( SUM_SAMPS * WRATE *X),
See the explanation in section 1.10.5 for an exact definition of the constants and variables involved in the equa-
tion above.
1.8.4 ADJUSTING THE DEMO BOARDS TO DIFFERENT SHUNT RESISTORS
The Demo Board REV 4.0 is prepared for use with 120 μ? or 50 μOhm (ANSI option) shunt resistors in all cur-
rent channels. A certain current flowing through the 120 μ? shunt resistors will result in the maximum voltage
drop at the ADC of the 71M6103 Remote Sensor ICs. This current is defined as IMAX and can be adjusted at
MPU location 0x03 (see section 1.10.3).
IMAX will need to be changed when different values are used for the shunt resistor(s) which will require that
WRATE has to be updated as shown in section 1.10.5.
The scaling of the neutral current measurement is controlled by the i_max2 variable at MPU location 0x01C.
1.8.5 USING THE PRE-AMPLIFIER
In its default setting, the 71M6543F applies a gain of 1 to the current input for the neutral current inputs
(IAP/IAN pins). This gain is controlled with the PRE_E bit in I/O RAM (see the Data Sheet). The command line
interface (RI command) can be used to set or reset this bit. It is recommended to maintain the gain of setting of
1 (RI2704=0x90).
1.8.6 USING CURRENT TRANSFORMERS (CTS)
All phases of the 71M6543 REV 5.0 Demo Board are equipped with connectors for external CTs. CTs should be
connected to the headers J5, J7, and J10. A burden resistor of 1.7 Ω is installed at the R26, R27, and R31 (and
corresponding resistors for phases B and C) locations. With a 2000:1 ratio CT, the maximum current will be 208
A.
For the CT configuration, a shunt resistor of 50 μ ? should be installed to measure the neutral current. Different
values can be accommodated by changing the value of i_max2 at MPU location 0x1C (see section 1.10.3).
Note: The CT configuration requires a different version of the Demo Code than is used for the shunt
configuration.
1.8.7 ADJUSTING THE DEMO BOARDS TO DIFFERENT VOLTAGE DIVIDERS
The 71M6543 Demo Board comes equipped with its own network of resistor dividers for voltage measurement
mounted on the PCB. The resistor values (for the 71M6543 REV 2.0 Demo Board) are 2.5477M ? (R66, R64,
R47, R39 combined) and 750 ? (R32, R52, R72), resulting in a ratio of 1:3,393.933. This means that VMAX
equals 176.78mV*3,393.933 = 600V. A large value for VMAX has been selected in order to have headroom for
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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 |
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