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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  
The 71M6543 AFE can also be directly interfaced to Current Transformers (CTs), as seen in Figure 3. In  
this case, all voltage and current channels are multiplexed into a single second-order sigma-delta ADC in  
the 71M6543 and the 71M6xx3 remote isolated sensors are not used. The fourth CT and the  
measurement of Neutral current via the IADC0-IADC1 current channel are optional.  
See Figure 32 for the meter wiring configuration corresponding to Figure 3.  
VREF  
IA  
IADC2  
MUX  
∆Σ ADC  
CONVERTER  
CT  
VREF  
VADC  
VREF  
FIR  
IADC3  
CE RAM  
22  
IB  
IADC4  
IADC5  
IADC6  
IADC7  
IADC0  
IADC1  
CT  
IC  
CT  
IN*  
CT  
VADC8 (VA)  
VADC9 (VB)  
VADC10 (VC)  
71M6543  
*IN = Neutral Current  
9/17/2010  
Figure 3. AFE Block Diagram (Four CTs)  
2.2.1 Signal Input Pins  
The 71M6543 features eleven ADC input pins.  
IADC0 through IADC7 are intended for use as current sensor inputs. These eight current sensor inputs can  
be configured as eight single-ended inputs, or can be paired to form four differential inputs. For best  
performance, it is recommended to configure the current sensor inputs as differential inputs (i.e., IADC0-  
IADC1, IADC2-IADC3, IADC4-IADC5 and IADC6-IADC7). The first differential input (IADC0-IADC1)  
features a pre-amplifier with a selectable gain of 1 or 8, and is intended for direct connection to a shunt  
resistor sensor, and can also be used with a Current Transformer (CT). The three remaining differential  
pairs (i.e., IADC2-IADC3, IADC4-IADC5 and IADC6-IADC7) may be used with CTs, or may be enabled to  
interface to a remote 71M6xx3 isolated current sensor providing isolation for a shunt resistor sensor using a  
low cost pulse transformer.  
The remaining three inputs VADC8 (VA), VADC9 (VB) and VADC10 (VC) are single-ended, and are  
intended for sensing each of the phase voltages in a polyphase meter application. These three single-ended  
inputs are referenced to the V3P3A pin.  
All ADC input pins measure voltage. In the case of shunt current sensors, currents are sensed as a voltage  
drop in the shunt resistor sensor. In the case of Current Transformers (CT), the current is measured as a  
voltage across a burden resistor that is connected to the secondary of the CT. Meanwhile, line voltages are  
sensed through resistive voltage dividers. The VADC8 (VA), VADC9 (VB) and VADC10 (VC) pins are  
single-ended and their common return is the V3P3A pin. See Figure 27, Figure 28, Figure 29 and Figure  
30 for detailed connections for each type of sensor. Also refer to the 71M6543 Demonstration Board  
schematic and bill of materials for typical component values used in these and other circuits.  
v1.2  
© 2008–2011 Teridian Semiconductor Corporation  
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