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71M6543H 参数 Datasheet PDF下载

71M6543H图片预览
型号: 71M6543H
PDF下载: 下载PDF文件 查看货源
内容描述: 可选增益1或8的一个电流电能表计量芯片的补偿 [Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation]
分类和应用:
文件页数/大小: 157 页 / 2164 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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71M6543F/H and 71M6543G/GH Data Sheet  
number of LCD segments and DIO pins can be implemented in software to accommodate various  
requirements.  
In addition to the temperature-trimmed ultra-precision voltage reference, the on-chip digital temperature  
compensation mechanism includes a temperature sensor and associated controls for correction of unwanted  
temperature effects on metrology and RTC accuracy (i.e., to meet the requirements of ANSI and IEC  
standards). Temperature-dependent external components such as the crystal oscillator, current  
transformers (CTs), Current Shunts and their corresponding signal conditioning circuits can be character-  
ized and their correction factors can be programmed to produce electricity meters with exceptional accuracy  
over the industrial temperature range.  
One of the two internal UARTs is adapted to support an Infrared LED with internal drive and sense  
configuration and can also function as a standard UART. The optical output can be modulated at 38 kHz.  
This flexibility makes it possible to implement AMR meters with an IR interface. A block diagram of the IC  
is shown in Figure 1.  
2.2  
Analog Front-End (AFE)  
The AFE functions as a data acquisition system, controlled by the MPU. The 71M6543 AFE may also be  
augmented by isolated 71M6xx3 sensors in order to support low-cost current shunt sensors. Figure 2,  
and Figure 3 show the two most common configurations; other configurations are possible. Sensors that  
are connected directly to the 71M6543 (i.e., IADC0-IADC1, VADC8, VADC9 and VADC10) are  
multiplexed into the single second-order sigma-delta ADC input for sampling in the 71M6543. The  
71M6543 ADC output is decimated by the FIR filter and stored in CE RAM where it can be accessed and  
processed by the CE.  
Shunt current sensors that are isolated by using a 71M6xx3 device, are sampled by a second-order  
sigma delta ADC in the 71M6xx3 and the signal samples are transferred over the digital isolation interface  
through the low-cost isolation pulse transformer.  
Figure 2 shows the 71M6543 using shunt current sensors and the 71M6xx3 isolated sensor devices.  
Figure 2 supports neutral current measurement with a local shunt connected to the IADC0-IADC1 input  
plus three remote (isolated) shunt sensors. As seen in Figure 2, when a remote isolated shunt sensor is  
connected via the 71M6xx3, the samples associated with this current channel are not routed to the  
multiplexer, and are instead transferred digitally to the 71M6543 via the isolation interface and are directly  
stored in CE RAM. The MUX_SELn[3:0] I/O RAM control fields allow the MPU to configure the AFE for the  
desired multiplexer sampling sequence. Refer to Table 1 and Table 2 for the appropriate CE code and the  
corresponding AFE settings.  
See Figure 31 for the meter wiring configuration corresponding to Figure 2.  
VREF  
IN*  
IADC0  
MUX  
∆Σ ADC  
CONVERTER  
Local  
Shunt  
VREF  
VREF  
FIR  
IADC1  
VADC  
VADC8 (VA)  
22  
VADC9 (VB)  
VADC10 (VC)  
IA  
INP  
INN  
INP  
SP  
IADC2  
IADC3  
Remote  
Shunt  
71M6xx3  
22  
SN  
CE RAM  
IB  
SP  
SN  
IADC4  
IADC5  
Remote  
Shunt  
Digital  
Isolation  
Interface  
71M6xx3  
71M6xx3  
22  
INN  
INP  
IC  
SP  
SN  
IADC6  
IADC7  
Remote  
Shunt  
22  
INN  
71M6543  
*IN = Neutral Current  
9/17/2010  
Figure 2: AFE Block Diagram (Shunts: One-Local, Three-Remotes)  
12  
© 2008–2011 Teridian Semiconductor Corporation  
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