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78M6610LMU 参数 Datasheet PDF下载

78M6610LMU图片预览
型号: 78M6610LMU
PDF下载: 下载PDF文件 查看货源
内容描述: 电能计量处理器的负荷监测单位 [Energy Measurement Processor for Load Monitoring Units]
分类和应用: 监控
文件页数/大小: 63 页 / 1710 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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78M6610+LMU Data Sheet  
Current Input Configuration  
The 78M6610+LMU supports multiple analog input configurations for determining the two load currents in  
a split-phase AC circuit. The device measures the current of any two conductors and uses this  
information to derive the load currents shown below.  
IA  
Conductor A  
IA= - IB - IN  
IB= - IA - IN  
IN  
Conductor N  
Conductor B  
IB  
Figure 13. Current Input Configuration  
Each calculated load current (IA and IB) is derived from the following function of the current input slots  
(S1 and S3) and 2 pairs of multiplier values (M1 and M3). This function derives source currents IA and IB  
by summing S1 x M1 and S3 x M3.  
M1  
S1  
S3  
Ix  
+
M3  
Figure 14. Current Computation  
The user sets the multiplier values for each current source in the CONFIG register using the model where  
a one (1) value adds the input, a two (2) value adds two of the input, a minus one (-1) value subtract the  
input, a zero (0) value does not include the input.  
CONFIG Bits  
Multiplier  
7:6  
5:4  
3:2  
1:0  
M3  
M1  
M3  
M1  
Source  
IB  
IA  
There are four choices for every M value as shown below.  
Bit Values  
00  
01  
10  
11  
M (multiplier) Value  
-1  
0
1
2
The output registers IA and IB are automatically scaled by a factor of 0.5 if M1 and M3 are both nonzero.  
For example, by setting the multiplier bits as follows:  
퐼퐵 = +1 ∗ 푆1 1 ∗ 푆3  
The effective content of the Vc register would result in:  
(
)
+1 ∗ 푆1 + (1 ∗ 푆3)  
푉푐 =  
2
This scaling is done to prevent the output register from overflowing.  
23  
Rev 0