MCP3909RD-3PH3 Microchip Technology, MCP3909RD-3PH3 Datasheet - Page 32
MCP3909RD-3PH3
Manufacturer Part Number
MCP3909RD-3PH3
Description
REF DESIGN FOR MCP3909 W/18F2520
Manufacturer
Microchip Technology
Datasheets
1.MCP3909T-ISS.pdf
(44 pages)
2.MCP3909T-ISS.pdf
(104 pages)
3.MCP3909RD-3PH3.pdf
(88 pages)
4.MCP3909-ISS.pdf
(40 pages)
Specifications of MCP3909RD-3PH3
Main Purpose
Power Management, Energy/Power Meter
Utilized Ic / Part
MCP3909, PIC18F2520, PIC18F4550
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Secondary Attributes
-
Embedded
-
Primary Attributes
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
MCP3909 3-Phase Energy Meter Reference Design
3.4.18
3.4.19
DS51643B-page 28
PHy_VAR (NOT IMPLEMENTED)
PERIOD
REGISTER 3-18:
This is the value for phase y reactive power. The goal is to get this value to equal X
VAR/LSB. This is done with the PHy_VAR_GLSB registers. When displaying the
reactive power for phase y, simply display the value in these registers with the decimal
point one digit in from the right, in milli-volt-amperes-reactive. (Note this decimal point
location, or LSB resolution of 0.1 mVAR, is specific for the 5(10)A, 220V rating that this
meter is designed for). This register is overwritten every LINE_CYC line cycles (written
only once if calibration is enabled).
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
REGISTER 3-19:
This 32-bit register represents the total number of clock ticks that elapsed over the most
recent LINE_CYC line cycles. Each LSB represents 1.6 us with a 40 MHz clock on the
microcontroller. This register is overwritten every LINE_CYC line cycles (written only
once if calibration is enabled).
PERIOD
Name
PHA_VAR
PHB_VAR
PHC_VAR
Name
Bits
PHY_VAR REGISTERS
PERIOD REGISTER
32
Bits
32
32
32
Address
Address
0x0C0
0x0BA
0x0B2
0x0B6
Cof
Cof
R
R
R
R
© 2008 Microchip Technology Inc.