MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 24

• Manufacturer Part Number: MCP3909RD-1PH1
• Description: BOARD DES MCP3909 ENERGY METER
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-1PH1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP3909, PIC18F85J90
• Primary Attributes: Single Phase Shunt Energy Meter
• Secondary Attributes: 16 Bit ADC
• Ic Function: Single Phase Energy Measurement IC
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 24
• Interface Type: SPI
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
3.4.8
3.4.9
3.4.10
DS51884A-page 24
PHA_VAR_RAW (NOT IMPLEMENTED)
PHA_VAR (NOT IMPLEMENTED)
PERIOD
REGISTER 3-8:
This is the raw phase A reactive power. This is the register to be read during calibration
for calculating the gain values associated with reactive phase y power,
PHA_VAR_GAIN and PHA_VAR_GLSB. This register is overwritten every LINE_CYC
line cycles (written only once if calibration is enabled).
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
REGISTER 3-9:
This is the value for phase A reactive power. The goal is to get this value to equal
X VAR/LSB. This is done with the PHA_VAR_GLSB registers. When displaying the
reactive power for phase A, 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 3-10:
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).
PHA_VAR_RAW
PERIOD
Name
PHA_VAR
Name
Name
Bits
PHA_VAR_RAW REGISTER
PHA_VAR REGISTER
PERIOD REGISTER
32
Bits
Bits
48
32
Address
Address
Address
0x0C0
0x0A0
0x0B2
Cof
Cof
Cof
R
R
R
© 2009 Microchip Technology Inc.