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MCP3907 Energy Meter Reference Design
2.6
BACK SIDE OF THE PCB – DETAILED DESCRIPTION
2.6.1
MCP3907 Device (U1)
The MCP3907 device is located on the right hand side of the back side of the board,
where the analog ground plane exists. The MCP3907 device has appropriate bypass
capacitors on V DD coming from the DC power supply circuitry. The MCP3907 device
has all its input logic pins connected to user selectable jumpers, with one exception,
the HPF pin. For this system the HPF is turned on with this pin connected to V DD ; the
device is in AC mode only. The REVP connection is not connected in this reference
design, and this pin should be left floating. The other three output pins (F OUT0 , F OUT1 ,
HF OUT ) are connected to nodes JP5, JP6 and JP7, described in this document.
2.6.2
DC Power Supply (C17, C16, U2, C18, D2)
The DC power supply is created from a half-wave Zener diode-limited AC signal,
feeding a 7805 +5V regulator. C17 and C16 divide the AC signal coming directly from
the line (designed in this document for 220V), and Zener diode D2 limits the peak
voltage to 15V. For more information regarding this power supply design see
application note AN994 – “IEC Compliant Active Energy Meter Design using the
MCP3905A/06A” (DS00994).
2.6.3
Metal Oxide Varistor (MOV1)
A Metal Oxide Varistor (MOV) is included in this design to suppress any high voltage
transients coming through the power lines.
2.6.4
Optical Isolator(U3)
An optical isolator is included in the MCP3907 Energy Meter Reference Design as an
additional level of protection for other circuitry used in advanced meter designs (PIC ?
microcontroller, DSP or otherwise). It is connected to the HF OUT frequency output of
the MCP3907 device. Depending on the meter design, this optical isolator may not be
required. This design is a direct-connect meter that has the entire PCB referenced to
the line side of the power supply, therefore any other circuitry would either need to be
biased to the same point or isolated using this scheme. A pull-up resistor is required on
the output of the optical isolator to allow the HF logic signal to appear.
2.6.5
The Analog Ground Plane, Power Supply Ground Plane, Moat
The MCP3907 energy meter reference design PCB is designed for low-noise
performance and immunity to external influences, as required by IEC62053-21 and
legacy IEC energy meter specifications, such as IEC61036. The DC power supply and
digital outputs are connected to the power supply ground plane (front side, on the right
of the board). The lower noise analog ground plane, including the MCP3907
connections, is on the opposite side of the board, separated by a moat between the two
ground planes. An inductive choke connects the two grounds. For further information
regarding low-noise PCB design for IEC compliance, see AN994 – “IEC Compliant
Active Energy Meter Design using the MCP3905A/06A” .
DS51917A-page 16
? 2010 Microchip Technology Inc.
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