MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 58

• 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

MCP3909 3-Phase Energy Meter Reference Design
DS51643B-page 54
EQUATION 5-28:
For RMS LSB correction, the following equations apply:
EQUATION 5-29:
EQUATION 5-30:
EQUATION 5-31:
EQUATION 5-32:
Note:
Note:
Note:
PHY_V_RMS_GLSB
PHY_I_RMS_GLSB
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
Convert to 16-bit signed integer for compatibility with 18F2520 register and
firmware calculations
ILSB = Value from
PHY_V_RMS_OFF
VLSB = Value from
=
=
----------------------------------------------------------------------- - 32768
------------------------------------------------------------------------- 32768
-------------- -
65536
-------------- -
65536
Table 6-2
VR
IR
Table 6-4
1
1
=
+
+
⎛
⎝
---------------------------------------------------- -
------------------------------ -
VG VG 1
PHY_I_RMS_OFF
PHY_V_RMS_OFF
VR1 VR2
⎛
⎝
⎛
⎝
based on I
------------ -
ILSB
------------- -
VLSB
based on V
I
V
•
B
B
–
65536
⎞
⎠
⎞
⎠
–
MAX
© 2008 Microchip Technology Inc.
⎞
⎠
B
value
–
value
VR
2
•
•