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MCP3907 Energy Meter Reference Design
The major components on the front side of the MCP3907 Energy Meter Reference
Design are listed below this paragraph. See descriptions in Section 2.5 “Front side of
the PCB – Detailed Description” :
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Shunts for Gain and FC selection (J11–J15)
Calibration Jumpers (J1–J10)
Output Connections for Mechanical Counter and Calibration (JP5-JP7)
Connection to Current Sensing Element (JP1, JP2)
Connection to Voltage or Phase Line and Ground Reference Point (JP3, JP4)
The major components on the back side of the MCP3907 Energy Meter Reference
Design are listed below. See descriptions in Section 2.6 “Back Side of the PCB –
Detailed Description” .
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MCP3907 Device (U1)
DC Power Supply (C17, C16, U2, C18, D2)
Metal Oxide Varistor (MOV1)
Optical Isolator(U3)
The Analog Ground Plane, Power Supply Ground Plane, Moat
The following two sections give an overview of the blocks and their functionality. For
more detailed information regarding design decisions and approach to IEC1036
compliance please refer to AN994 application note – “IEC Compliant Active Energy
Meter Design using the MCP3905A/06A” . For a more detailed circuit schematic, refer
to Appendix A. “Schematic and Layouts” and Appendix B. “Bill of Materials
(BOM)” .
Shunts for Gain,
FC and HPF selection
(J11-J15)
Analog
Ground Plane
Output Conn.
(JP5-JP7)
Power Supply
Ground Plane
Current Conn.
(JP1,JP2)
Calibration
Jumpers (J1-J10)
FRONT
DC Power
Supply
Power Supply
Ground Plane
Opto.
Isolator (U3)
BACK
MCP3907 (U1)
Analog
Ground Plane
DS51917A-page 14
FIGURE 2-3:
MCP3907 Energy Meter Reference Design Block Diagram.
? 2010 Microchip Technology Inc.
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