MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 36

• 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
5.3
FIGURE 5-2:
DS51884A-page 36
ENERGY_VA_L:32
ENERGY_VA_L_RAW:48
RMS CURRENT, RMS VOLTAGE, APPARENT POWER SIGNAL FLOW AND
CALIBRATION
VOLTAGE
CURRENT
MCP3909
ENERGY_VA_Z:64
ADC
ADC
ENERGY_VA:64
kVAh
5.3.1
The RMS current and voltage outputs require a two point calibration reading at
configurations C1 and C4. The automated USB software performs these calibrations
suggested on the calibration values entered in the text boxes on the meter design
window.
The following table represents the registers being set for RMS Current and Voltage
calibration.
TABLE 5-2:
RMS Current, Voltage, and Apparent Power Flow.
PHA_V_RMS_GLSB
ENERGY_VA_GLSB
PHA_I_RMS_GLSB
ENERGY_VA_GLSB:16
PHA_V_RMS_OFF
PHA_I_RMS_OFF
PHA_VA_GLSB
RMS Voltage
Register
RMS Current
RMS Current, RMS Voltage, and Apparent Power Overview and
Signal Path
X
X
X
2
2
PERIOD:32 (INTERNAL REGISTER)
RMS CURRENT, RMS VOLTAGE, AND APPARENT POWER
CALIBRATION REGISTERS
PHA_I_RMS_OFF:16
PHA_V_RMS_OFF:16
Apparent Power
X
Σ
Σ
Not Implemented
Section 5.3.9
Section 5.3.9
Section 5.3.9
Section 5.3.9
Section 5.3.3
Equation
X
PHA_V_RMS_GLSB:16
PHA_I_RMS_GLSB:16
X
X
PHA_VA_GAIN:16
X
© 2009 Microchip Technology Inc.
Configurations Needed
A
V
C1 ONLY
C1 ONLY
PH_V_RMS_RAW:16
PHA_I_RMS_RAW:16
PHA_I_RMS:16
C1, C4
C1, C4
C1, C4
C1, C4
PHA_V_RMS:16
PHA_VA_RAW
PHA_VA:32
X