MCP3909RD-3PH3 Microchip Technology, MCP3909RD-3PH3 Datasheet - Page 53

• Manufacturer Part Number: MCP3909RD-3PH3
• Description: REF DESIGN FOR MCP3909 W/18F2520
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-3PH3

• Main Purpose: Power Management, Energy/Power Meter
• Utilized Ic / Part: MCP3909, PIC18F2520, PIC18F4550
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

© 2008 Microchip Technology Inc.
5.3.7
For active power the following equations apply for calculating the time shift delay for a
given phase.
EQUATION 5-11:
EQUATION 5-12:
EQUATION 5-13:
EQUATION 5-14:
EQUATION 5-15:
LINE_CYC_NUM_2
LINE_CYC_NUM_1
PHY_DELAY
Note 1:
2:
Phase Matching Equations
W1
W2
Convert to 8-bit signed integer for compatibility with 18F2520 register and
firmware calculations.
Since 60 degrees (default) is being subtracted from the measured
quantity, the current should lag the voltage under configuration C2.
=
=
=
PHY_W_RAW @ PF
PHY_W_RAW @ PF
------------------------------------------------------------------------------------------------------------------ - 128
COS
=
=
LINE_CYC_NUM @ PF
1 –
LINE_CYC_NUM @ PF
⎛
⎝
W2 LINE_CYC_NUM2
---------------------------------------------------------- -
W1 LINE_CYC_NUM1
⁄
⁄
2.8125
=
=
1, Configuration C1
0.5 Configuration C2
,
Meter Calibration
=
=
⎞
⎠
0.5, Configuration C2
1 Configuration C1
×
,
180
-------- -
PI
–
DS51643B-page 49
60
•