MCP3909RD-3PH3 Microchip Technology, MCP3909RD-3PH3 Datasheet - Page 33

• Manufacturer Part Number: MCP3909RD-3PH3
• Description: REF DESIGN FOR MCP3909 W/18F2520
• Manufacturer: Microchip Technology

Specifications of MCP3909RD-3PH3

• Main Purpose: Power Management, Energy/Power Meter
• Utilized Ic / Part: MCP3909, PIC18F2520, PIC18F4550
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

3.4.20
© 2008 Microchip Technology Inc.
PIC18F2520 Calculation and Register Description
ENERGY_W_
REGISTER 3-20:
These four registers represent the total active energy accumulated. The
ENERGY_W_L_RAW register is the total active energy accumulated over the previous
LINE_CYC line cycles.
Accumulation is done every line cycle and is:
EQUATION 3-1:
During calibration, ENERGY_W_Z, ENERGY_W, and ENERGY_W_L_RAW will all
have the same value.
Also, during calibration, the PHy_W_OFF register additions are skipped and the
PHy_W_GAIN values are all set to their default value of 0x4000 (16,384).
The ENERGY_W_L_RAW register is the register that should be read when calibrating
CFNUM and CFDEN.
This register is updated every line cycle (updating ends once LINE_CYC line cycles
have passed if calibration is enabled).
ENERGY_W
Where:
+
+
ENERGY_W_L_RAW
PERIOD
(
(
PHB_W_RAW
PHC_W_RAW
ENERGY_W_Z
ENERGY_W_L
ENERGY_W
Name
=
=
ENERGY_W
+
+
the period (in 1.6 µs clock ticks) for the most recent line cycle.
ENERGY_W_ REGISTERS
PHB_W_OFF
PHC_W_OFF
Bits
+
64
64
32
48
(
PHA_W_RAW
)
)
•
•
⎛
⎝
⎛
⎝
Address
PHB_W_GAIN
----------------------------------- -
PHC_W_GAIN
------------------------------------ -
0x0CC
0x0DA
0x0C4
0x0D4
32768
32768
+
PHA_W_OFF
Cof
R
R
R
R
⎞
⎠
⎞
⎠
•
PERIOD
---------------------- -
65536
)
•
⎛
⎝
PHA_W_GAIN
----------------------------------- -
DS51643B-page 29
32768
⎞
⎠