MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 41

• Manufacturer Part Number: MCP3909RD-1PH1
• Description: BOARD DES MCP3909 ENERGY METER
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-1PH1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP3909, PIC18F85J90
• Primary Attributes: Single Phase Shunt Energy Meter
• Secondary Attributes: 16 Bit ADC
• Ic Function: Single Phase Energy Measurement IC
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 24
• Interface Type: SPI
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

© 2009 Microchip Technology Inc.
5.3.5
For active power the following equations apply for calculating the time shift delay for a
given phase.
EQUATION 5-9:
EQUATION 5-10:
EQUATION 5-11:
EQUATION 5-12:
EQUATION 5-13:
LINE_CYC_NUM_2
LINE_CYC_NUM_1
PHA_DELAY
Note 1:
2:
Configuration C2 Equations - Phase Delay
W1
W2
Convert to 8-bit signed integer for compatibility with PIC18F2520 register
and firmware calculations.
Since 60 degrees (default) is being subtracted from the measured
quantity, the current should lag the voltage under configuration C2.
=
=
=
PHA_W_RAW @ PF
PHA_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
–
DS51884A-page 41
60
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