MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 46

• 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 46
EQUATION 5-26:
For RMS LSB correction, the following equations apply:
EQUATION 5-27:
EQUATION 5-28:
EQUATION 5-29:
EQUATION 5-30:
Note:
Note:
Note:
PHA_V_RMS_GLSB
PHA_I_RMS_GLSB
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
ILSB = Value from Table 5-3 based on I
PHA_V_RMS_OFF
VLSB = Value from Table 5-5 based on V
=
=
----------------------------------------------------------------------- - 32768
------------------------------------------------------------------------- - 32768
-------------- -
65536
-------------- -
65536
VR
IR
1
1
=
+
+
⎛
⎝
---------------------------------------------------- -
------------------------------ -
VG VG 1
PHA_I_RMS_OFF
PHA_V_RMS_OFF
⎛
⎝
⎛
⎝
VR1 VR2
------------ -
ILSB
------------- -
VLSB
I
V
•
B
B
–
65536
⎞
⎠
⎞
⎠
–
MAX
© 2009 Microchip Technology Inc.
B
⎞
⎠
value
–
value
VR
2
•
•