MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 51
MCP3909RD-3PH1
Manufacturer Part Number
MCP3909RD-3PH1
Description
REF DESIGN MCP3909 3PH ENGY MTR
Manufacturer
Microchip Technology
Datasheets
1.MCP3909T-ISS.pdf
(44 pages)
2.MCP3909T-ISS.pdf
(104 pages)
3.MCP3909RD-3PH3.pdf
(88 pages)
Specifications of MCP3909RD-3PH1
Main Purpose
Power Management, Energy/Power Meter
Embedded
No
Utilized Ic / Part
MCP3909, PIC18F2520, PIC18F4550
Primary Attributes
3-Ph, 220 VAC, In Case, LCD, USB, GUI
Secondary Attributes
Opto-Isolated Interface for Safety
Operating Voltage
220 V
Operating Current
5 A
Description/function
Energy Meter
For Use With/related Products
MCP3909
Lead Free Status / RoHS Status
Not applicable / Not applicable
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© 2008 Microchip Technology Inc.
5.3.5
The following equations apply for calculating the gain matching in between phases.
The notation “<S>” is used for the standard phase measurement, thus the
PH<S>_W_RAW number is read from the standard phase register, STAND_W_RAW,
that was recorded during the standard phase calibration.
The notation “<Un>” represents the value for the phase being matched to the standard
phase.
For active power gain matching:
EQUATION 5-9:
For apparent power gain matching:
EQUATION 5-10:
Note:
Note:
Gain Matching Equations
Convert to 16-bit signed integer for compatibility with 18F2520 register and
firmware calculations.
Convert to 16-bit signed integer for compatibility with 18F2520 register and
firmware calculations.
PHY_W_GAIN
PHY_VA_GAIN
=
=
⎛
⎝
STAND_W_RAW
---------------------------------------- -
⎛
⎝
PHY_W_RAW
STAND_W_RAW
---------------------------------------- -
PHY_VA_RAW
Meter Calibration
⎞
⎠
⎞
⎠
•
•
16384
16384
DS51643B-page 47
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