MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 33

• 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

5.1
© 2009 Microchip Technology Inc.
CALIBRATION OVERVIEW
The method to calculate the values for the calibration registers in “Chapter
3. “PIC18F85J90 Calculation and Register Description” are described in this
chapter. These registers are used to remove offset, set gain and phase adjustments,
and include (units)/LSB adjustments for the meter outputs. The calibration flow charts
and equations presented in this section are all automated using Microchip’s “Single
Phase Energy Meter Calibration Software”, downloadable from Microchip’s energy
metering web site. The following calibration routines are described in this chapter.
• Active Power Calibration
• RMS Current and Voltage Calibration
• Apparent Power Calibration
The method of calibrating these three separate signal flows can be combined into
4 different calibration configurations. These configurations consist of supplying specific
voltages and currents at specific phase angles to the meter during calibration.
Depending on the accuracy and meter type, not all 4 calibration configurations are
required to fully calibrate a meter. In some cases only a single point calibraton is
required. The software allows individual configurations to be turned on or off when
going through the calibration flow.
Chapter 5. Meter Calibration
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
DS51884A-page 33