MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 34

• 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
3.4.21
DS51643B-page 30
ENERGY_VA_
REGISTER 3-21:
These four registers represent the total apparent energy accumulated so far. Energy
from each LINE_CYC line cycles is:
EQUATION 3-2:
Note that during calibration, this value, ENERGY_VA_Z, and ENERGY_VA_L_RAW
will all have the same value.
This register is updated every LINE_CYC line cycles (updating ends after first update
if calibration is enabled).
ENERGY_VA
ENERGY_VA_L_RAW
+
+
Where:
(
(
PHB_I_RMS_RAW
PHC_I_RMS_RAW
ENERGY_VA_Z
ENERGY_VA_L
PERIOD =
ENERGY_VA
Name
=
ENERGY_VA
the period (in 1.6 µs clock ticks) for the most recent LINE_CYC
line cycles.
•
•
ENERGY_VA_ REGISTERS
PHB_V_RMS_RAW
PHC_V_RMS_RAW
Bits
64
64
32
48
+
(
PHA_I_RMS_RAW
Address
0x0DE
0x0EE
0x0E6
0x0F4
)
)
•
•
⎛
⎝
⎛
⎝
PHB_VA_GAIN
-------------------------------------- -
PHC_VA_GAIN
-------------------------------------- -
32768
32768
•
Cof
R
R
R
R
PHA_V_RMS_RAW
⎞
⎠
⎞
⎠
•
© 2008 Microchip Technology Inc.
PERIOD 128
------------------------------------- -
65536
)
•
⎛
⎝
•
PHA_VA_GAIN
-------------------------------------- -
32768
⎞
⎠