MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 46

• 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
5.3
FIGURE 5-2:
DS51643B-page 42
ENERGY_VA_L:32
RMS CURRENT, RMS VOLTAGE, APPARENT POWER SIGNAL FLOW AND
CALIBRATION
VOLTAGE
CURRENT
ENERGY_VA_L_RAW:48
ADC
ADC
MCP3909
ENERGY_VA_Z:64
ENERGY_VA_GLSB:16 (NOT IMPLEMENTED)
ENERGY_VA:64
5.3.1
The RMS current and voltage outputs require a two point calibration reading at
configurations C1 and C4. The automated USB software performs these calibrations
suggested on the calibration values entered in the text boxes on the meter design
window.
The following table represents the registers being set for RMS Current and Voltage
calibration.
TABLE 5-2:
kVAh
RMS Current, Voltage, and Apparent Power Flow.
ENERGY_VA_GLSB
PHy_V_RMS_GLSB
PHy_I_RMS_GLSB
PHy_V_RMS_OFF
PHy_I_RMS_OFF
PHy_VA_GLSB
PHy_VA_GAIN
Register
RMS Voltage
RMS Current
RMS Current, RMS Voltage, and Apparent Power Overview and
Signal Path
X
X
X
2
2
RMS CURRENT, RMS VOLTAGE, AND APPARENT POWER
CALIBRATION REGISTERS
PERIOD:32 (INTERNAL REGISTER)
PHy_I_RMS_OFF:16
PHy_V_RMS_OFF:16
Apparent Power
Not Implemented
X
Section 5.3.11
Section 5.3.11
Section 5.3.11
Section 5.3.11
Σ
Σ
Section 5.3.5
Section 5.3.3
Equation
X
PHy_V_RMS_GLSB:16
PHy_I_RMS_GLSB:16
Σ
X
X
PHA_VA_GAIN:16
X
Other 2
Phases
© 2008 Microchip Technology Inc.
A
V
PHy_I_RMS_RAW:16
PHy_I_RMS:16
PHy_V_RMS:16
PHy_V_RMS_RAW:16
PHA_VA_RAW
PHA_VA:32
X