MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 28

• 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
3.4.4
3.4.5
3.4.6
3.4.7
DS51643B-page 24
LINE_CYC
LINE_CYC_CNT
PHy_I_RMS_RAW2
PHy_I_RMS_RAW
REGISTER 3-4:
Number of line cycles as a power of two. A setting of 0 indicates 2
setting of 1 is 2 line cycles (2
which is 256 line cycles. When written, this register will not take effect until the previous
number of line cycles has been acquired.
REGISTER 3-5:
This register counts from 0 and finishes at 2
LINE_CYC represents the value in the LINE_CYC register.
REGISTER 3-6:
These registers are the square of the raw RMS value from the phase y current A/D
converter in LSBs. By definition, these registers will always contain a positive value,
including the situation where power is negative from a backwards CT or otherwise.
These registers are overwritten every LINE_CYC line cycles and are written only once
if calibration is enabled.
REGISTER 3-7:
These registers are the raw RMS value from the phase y current A/D converter in LSBs
(square root of the top 32-bits of (PHA_I_RMS_RAW2 + PHA_I_RMS_OFF)). By
definition, these registers will always contain a positive value (even if the CT is in
backwards). These registers are overwritten every LINE_CYC line cycles and are writ-
ten only once if calibration is enabled.
LINE_CYC_CNT
PHA_I_RMS_RAW2
PHB_I_RMS_RAW2
PHC_I_RMS_RAW2
LINE_CYC
PHA_I_RMS_RAW
PHB_I_RMS_RAW
PHC_I_RMS_RAW
Name
Name
Name
Name
Bits
16
Bits
LINE_CYC REGISTERS
LINE_CYC_CNT REGISTER
PHY_I_RMS_RAW2 REGISTERS
PHY_I_RMS_RAW REGISTERS
16
Bits
Bits
48
48
48
16
16
16
Address
0x00A
1
Address
Address
Address
), a setting of 2 is 4 lines cycles (2
0x00C
0x010
0x024
0x038
0x016
0x02A
0x03E
R/W
Cof
Cof
Cof
Cof
R
R
R
R
R
R
R
(LINE_CYC)
-1 and then re-starts at 0, where
© 2008 Microchip Technology Inc.
2
), up to a setting of 8
0
or 1 line cycle. A