MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 20

• Manufacturer Part Number: MCP3909RD-3PH1
• Description: REF DESIGN MCP3909 3PH ENGY MTR
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-3PH1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: No
• Utilized Ic / Part: MCP3909, PIC18F2520, PIC18F4550
• Primary Attributes: 3-Ph, 220 VAC, In Case, LCD, USB, GUI
• Secondary Attributes: Opto-Isolated Interface for Safety
• Operating Voltage: 220 V
• Operating Current: 5 A
• Description/function: Energy Meter
• For Use With/related Products: MCP3909
• Lead Free Status / RoHS Status: Not applicable / Not applicable

MCP3909 3-Phase Energy Meter Reference Design
3.2
FIGURE 3-1:
DS51643B-page 16
Note 1:
Current
Voltage
MCP3909
ADC
ADC
SIGNAL FLOW SUMMARY
CF OUTPUT
FREQUENCY!
These functions are not implemented with this version of the firmware/software release.
Digital to
Frequency
Converter
/
X
2
RMS voltage, RMS current, active power, apparent power, and the calibration output
pulse are all calculated through the following process described in Figure 3-1. The
calibration registers for each calculation are shown as well as the output registers.
PIC18F2520 Signal Flow (Phase A), not all registers shown.
X
Φ
RMS Voltage
PHA_V_RMS_OFF:16
X
2
PHA_DELAY:8
Σ
RMS Current
Active Power
PHA_I_RMS_OFF:16
PHA_W_OFF:32
Σ
Σ
X
PHA_W_GAIN:16
X
X
Apparent Power
X
Meter Output (LCD or other)
X
© 2008 Microchip Technology Inc.
X
X
Σ
X
X
PHA_VA_GAIN:16
PHASES
B & C
Σ
X
X