MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 29

• 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

3.4.8
3.4.9
3.4.10
3.4.11
© 2008 Microchip Technology Inc.
PHy_V_RMS
PIC18F2520 Calculation and Register Description
PHy_I_RMS
PHy_V_RMS_RAW2
PHy_V_RMS_RAW
REGISTER 3-8:
These registers are the RMS value of phase y current in X A/LSB, as determined by
the value in the PHA_I_RMS_GLSB register. When displaying the RMS current for
phase y, simply display the (decimal) value in these registers with the decimal point two
digits in from the right. (Note this decimal point location of 0.01A LSB resolution is
specific for the 5(10)A, 220V rating that this meter is designed for). These registers are
overwritten every LINE_CYC line cycles (written only once if calibration is enabled).
REGISTER 3-9:
These registers are the square of the raw RMS value from the phase A voltage A/D
converter in LSBs. By definition, they will always contain a positive value. These
registers are overwritten every LINE_CYC line cycles (written only once if calibration is
enabled).
REGISTER 3-10:
This is the raw RMS value from the phase y voltage A/D converter in LSBs (square root
of the top 32-bits of PHA_V_RMS_RAW2 + PHA_V_RMS_OFF). By definition, these
registers will always contain a positive value. Each of these registers is overwritten
every LINE_CYC line cycles (written only once if calibration is enabled).
REGISTER 3-11:
These registers are the RMS value of phase y voltage, in X 0.1V/LSB, as determined
by the value in the PHy_V_RMS_GLSB register. When displaying the RMS voltage for
phase y, simply display the value in these registers with the decimal point one digit in
from the right. (Note this decimal point location, or LSB resolution of 0.1V, is specific for
the 5(10)A, 220V rating that this meter is designed for). These registers are overwritten
every LINE_CYC line cycles (written only once if calibration is enabled).
PHC_V_RMS_RAW2
PHA_V_RMS_RAW2
PHB_V_RMS_RAW2
PHC_V_RMS_RAW
PHA_V_RMS_RAW
PHB_V_RMS_RAW
PHA_V_RMS
PHB_V_RMS
PHC_V_RMS
PHA_I_RMS
PHB_I_RMS
PHC_I_RMS
Name
Name
Name
Name
PHY_I_RMS REGISTERS
PHY_V_RMS_RAW2 REGISTERS
PHY_V_RMS_RAW REGISTERS
PHY_V_RMS REGISTERS
Bits
Bits
Bits
Bit
16
16
16
48
48
48
16
16
16
16
16
16
Address
Address
Address
Address
0x02C
0x01A
0x02E
0x04A
0x018
0x040
0x042
0x020
0x034
0x048
0x022
0x036
Cof
Cof
Cof
Cof
R
R
R
R
R
R
R
R
R
R
R
R
DS51643B-page 25