MCP3909RD-1PH1 Microchip Technology, MCP3909RD-1PH1 Datasheet - Page 25

• 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

3.4.11
© 2009 Microchip Technology Inc.
ENERGY_W_
REGISTER 3-11:
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 PHA_W_OFF register additions are skipped and the
PHA_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
Calculation and Register Description
=
=
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
----------------------------------- -
DS51884A-page 25
32768
⎞
⎠