MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 34

• 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
DS51884A-page 34
5.1.1
Calibration of the single phase energy meter involves up to four different test
configurations.
For example, meter design example 5(10)A, I
The four different test configuraitons are listed here: :
1. Configuration C1: Gain - Basic voltage V
2. Configuration C2: Phase - Basic voltage V
3. Configuration C3: Offset - Basic voltage V
4. Configuration C4: Mid-range - 1/10 of Basic voltage V
These calibration configurations are typically steps in a sequence. Almost always,
configuration C1 is the most important and must be done first. The other configurations
require values obtained from configuration C1, but are not dependent on values
obtained from the other configurations. In other words, C1 is probably the first step,
while the other configurations can be done in any order, and are optional depending on
the meter type.
The meter constant is typically given in units of impulses per kilo-watt hour. As an
example, the calibration output frequency of CF, METER_CONSTANT =
3200 imp/kWh or 6400 imp/kWh.
of 1.
For example, 220V and 5A.
factor of 0.5.
1.
For example, 220V and 50 mA.
factor of 1.
For example, 22V and 1A.
I
B
, V
B
, Meter Constant and Calibration Configurations
B
B
and basic current I
= 5, I
B
B
and 1/100 of I
and basic current I
MAX
= 10A.
© 2009 Microchip Technology Inc.
B
and 1/10 of I
B
at a power factor of
B
at a power factor
B
at a power
B
at a power