MCP3905RD-PM1 Microchip Technology, MCP3905RD-PM1 Datasheet - Page 14

• Manufacturer Part Number: MCP3905RD-PM1
• Description: REFERENCE DESIGN FOR MCP3905
• Manufacturer: Microchip Technology

Specifications of MCP3905RD-PM1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: No
• Utilized Ic / Part: MCP3905/6
• Primary Attributes: 1-Phase, 220 VAC, In Case, With Mechanical Counter
• Secondary Attributes: On Board Transformerless AC/DC 5V Supply
• Silicon Manufacturer: Microchip
• Silicon Core Number: MCP3905A,MCP3906A
• Kit Application Type: Power Management
• Application Sub Type: Energy Meter
• Kit Contents: Design Guides
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCP3905A/06A Energy Meter Reference Design
FIGURE 2-3:
2.5
DS51565B-page 10
FRONT-SIDE OF PCB DETAILED DESCRIPTION
MCP3905A/06A Energy Meter Reference Design Block Diagram.
2.5.1
Positions for both logic-high and logic-low are here for all gain and frequency constant
selections. The logic-high positions are labeled “J1H” and the logic-low positions are
labeled “J1L” (Jumper 1 used here as an example). Do not short both the high and the
low positions for any one jumper.
2.5.2
Calibration resistors for each of these jumper locations are located directly beneath the
associated jumper. When a shorting resistor or jumper is in place, the associated
calibration resistor is shorted and bypassed.
2.5.3
JP5 and JP6 are the differential output drive for the mechanical counter.
JP7 is the calibration or microcontroller output that is connected to HF
MCP3905A/06A devices. A LED is supplied to assist in any optical calibration
schemes.
2.5.4
These two connections lead directly through LRC filtering into Channel 0 of the
MCP3905A/06A. The schematic in Appendix A uses a low-cost shunt as the
current-sensing element. The shunt resistance should be placed in parallel with these
two connections, between JP1 and JP2.
Current Conn.
(JP1,JP2)
DC Power
Selection (J11-J15)
Supply
Power Supply
Shunts for Gain,
Ground Plane
FC and HPF
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)
Ground Plane
Jumpers (J1-J10)
Analog
Calibration
Opto.
Isolator (U3)
FRONT
BACK
Output Connections (JP5-JP7)
Ground Plane
Analog
MCP3905A
Ground Plane
Power Supply
Voltage Conn.
(JP3,JP4)
© 2009 Microchip Technology Inc.
(U1)
OUT
on the