MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 57

• Manufacturer Part Number: MCP3909RD-3PH1
• Description: REF DESIGN MCP3909 3PH ENGY MTR
• Manufacturer: Microchip Technology

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

© 2008 Microchip Technology Inc.
5.3.11
The following equations represent the proper method for calculating the calibration and
correction factors for the RMS current and RMS voltage. The PC calibration software
handles these calculations automatically.
Typically, the V
For RMS Offset the following equations apply:
EQUATION 5-21:
EQUATION 5-22:
EQUATION 5-23:
EQUATION 5-24:
EQUATION 5-25:
EQUATION 5-26:
EQUATION 5-27:
Note:
Equations for RMS Calibration
Convert to 16-bit signed integer for compatibility with 18F2520 register and
firmware calculations
VR1
VR2
IR2
IR1
MIN
PHY_I_RMS_OFF
and I
=
=
=
=
PHY_I_RMS_RAW2 @ I
PHY_V_RMS_RAW2 @ I
PHY_I_RMS_RAW2 @ I
PHY_V_RMS_RAW2 @ I
MIN
voltages and currents will be 1/10 of the V
V
I
G
G
=
=
=
I
-------------------- -
I
V
---------------------- -
V
B
B
B
B
⎛
⎝
----------------------------------------------- -
@ C1
@ C4
@ C1
@ C4
--------------------------- -
IG IG 1
IR1 IR2
•
B
B
–
B
B
65536
, Configuration C1
, Configuration C4
, Configuration C1
, Configuration C4
Meter Calibration
–
⎞
⎠
–
IR
2
DS51643B-page 53
B
and I
B
values.